http: add http-parser

The code is under the MIT lincense

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

3 files changed, 2075 insertions, 0 deletions

diff --git a/deps/http-parser/LICENSE-MIT b/deps/http-parser/LICENSE-MIT
new file mode 100644
index 000000000..58010b388
--- /dev/null
+++ b/deps/http-parser/LICENSE-MIT
@@ -0,0 +1,23 @@
+http_parser.c is based on src/http/ngx_http_parse.c from NGINX copyright
+Igor Sysoev.
+
+Additional changes are licensed under the same terms as NGINX and
+copyright Joyent, Inc. and other Node contributors. All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE. 
diff --git a/deps/http-parser/http_parser.c b/deps/http-parser/http_parser.c
new file mode 100644
index 000000000..e905747a3
--- /dev/null
+++ b/deps/http-parser/http_parser.c
@@ -0,0 +1,1776 @@
+/* Based on src/http/ngx_http_parse.c from NGINX copyright Igor Sysoev
+ *
+ * Additional changes are licensed under the same terms as NGINX and
+ * copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#include <http_parser.h>
+#include <assert.h>
+#include <stddef.h>
+
+
+#ifndef MIN
+# define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+
+#if HTTP_PARSER_DEBUG
+#define SET_ERRNO(e)                                                 \
+do {                                                                 \
+  parser->http_errno = (e);                                          \
+  parser->error_lineno = __LINE__;                                   \
+} while (0)
+#else
+#define SET_ERRNO(e)                                                 \
+do {                                                                 \
+  parser->http_errno = (e);                                          \
+} while(0)
+#endif
+
+
+#define CALLBACK2(FOR)                                               \
+do {                                                                 \
+  if (settings->on_##FOR) {                                          \
+    if (0 != settings->on_##FOR(parser)) {                           \
+      SET_ERRNO(HPE_CB_##FOR);                                       \
+      return (p - data);                                             \
+    }                                                                \
+  }                                                                  \
+} while (0)
+
+
+#define MARK(FOR)                                                    \
+do {                                                                 \
+  FOR##_mark = p;                                                    \
+} while (0)
+
+#define CALLBACK(FOR)                                                \
+do {                                                                 \
+  if (FOR##_mark) {                                                  \
+    if (settings->on_##FOR) {                                        \
+      if (0 != settings->on_##FOR(parser,                            \
+                                 FOR##_mark,                         \
+                                 p - FOR##_mark))                    \
+      {                                                              \
+        SET_ERRNO(HPE_CB_##FOR);                                     \
+        return (p - data);                                           \
+      }                                                              \
+    }                                                                \
+    FOR##_mark = NULL;                                               \
+  }                                                                  \
+} while (0)
+
+
+#define PROXY_CONNECTION "proxy-connection"
+#define CONNECTION "connection"
+#define CONTENT_LENGTH "content-length"
+#define TRANSFER_ENCODING "transfer-encoding"
+#define UPGRADE "upgrade"
+#define CHUNKED "chunked"
+#define KEEP_ALIVE "keep-alive"
+#define CLOSE "close"
+
+
+static const char *method_strings[] =
+  { "DELETE"
+  , "GET"
+  , "HEAD"
+  , "POST"
+  , "PUT"
+  , "CONNECT"
+  , "OPTIONS"
+  , "TRACE"
+  , "COPY"
+  , "LOCK"
+  , "MKCOL"
+  , "MOVE"
+  , "PROPFIND"
+  , "PROPPATCH"
+  , "UNLOCK"
+  , "REPORT"
+  , "MKACTIVITY"
+  , "CHECKOUT"
+  , "MERGE"
+  , "M-SEARCH"
+  , "NOTIFY"
+  , "SUBSCRIBE"
+  , "UNSUBSCRIBE"
+  , "PATCH"
+  };
+
+
+/* Tokens as defined by rfc 2616. Also lowercases them.
+ *        token       = 1*<any CHAR except CTLs or separators>
+ *     separators     = "(" | ")" | "<" | ">" | "@"
+ *                    | "," | ";" | ":" | "\" | <">
+ *                    | "/" | "[" | "]" | "?" | "="
+ *                    | "{" | "}" | SP | HT
+ */
+static const char tokens[256] = {
+/*   0 nul    1 soh    2 stx    3 etx    4 eot    5 enq    6 ack    7 bel  */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*   8 bs     9 ht    10 nl    11 vt    12 np    13 cr    14 so    15 si   */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  16 dle   17 dc1   18 dc2   19 dc3   20 dc4   21 nak   22 syn   23 etb */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  24 can   25 em    26 sub   27 esc   28 fs    29 gs    30 rs    31 us  */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  32 sp    33  !    34  "    35  #    36  $    37  %    38  &    39  '  */
+       ' ',      '!',     '"',     '#',     '$',     '%',     '&',    '\'',
+/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
+        0,       0,      '*',     '+',      0,      '-',     '.',     '/',
+/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
+       '0',     '1',     '2',     '3',     '4',     '5',     '6',     '7',
+/*  56  8    57  9    58  :    59  ;    60  <    61  =    62  >    63  ?  */
+       '8',     '9',      0,       0,       0,       0,       0,       0,
+/*  64  @    65  A    66  B    67  C    68  D    69  E    70  F    71  G  */
+        0,      'a',     'b',     'c',     'd',     'e',     'f',     'g',
+/*  72  H    73  I    74  J    75  K    76  L    77  M    78  N    79  O  */
+       'h',     'i',     'j',     'k',     'l',     'm',     'n',     'o',
+/*  80  P    81  Q    82  R    83  S    84  T    85  U    86  V    87  W  */
+       'p',     'q',     'r',     's',     't',     'u',     'v',     'w',
+/*  88  X    89  Y    90  Z    91  [    92  \    93  ]    94  ^    95  _  */
+       'x',     'y',     'z',      0,       0,       0,      '^',     '_',
+/*  96  `    97  a    98  b    99  c   100  d   101  e   102  f   103  g  */
+       '`',     'a',     'b',     'c',     'd',     'e',     'f',     'g',
+/* 104  h   105  i   106  j   107  k   108  l   109  m   110  n   111  o  */
+       'h',     'i',     'j',     'k',     'l',     'm',     'n',     'o',
+/* 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w  */
+       'p',     'q',     'r',     's',     't',     'u',     'v',     'w',
+/* 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 del */
+       'x',     'y',     'z',      0,      '|',     '}',     '~',       0 };
+
+
+static const int8_t unhex[256] =
+  {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  , 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1
+  ,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  ,-1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  ,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1
+  };
+
+
+static const uint8_t normal_url_char[256] = {
+/*   0 nul    1 soh    2 stx    3 etx    4 eot    5 enq    6 ack    7 bel  */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*   8 bs     9 ht    10 nl    11 vt    12 np    13 cr    14 so    15 si   */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  16 dle   17 dc1   18 dc2   19 dc3   20 dc4   21 nak   22 syn   23 etb */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  24 can   25 em    26 sub   27 esc   28 fs    29 gs    30 rs    31 us  */
+        0,       0,       0,       0,       0,       0,       0,       0,
+/*  32 sp    33  !    34  "    35  #    36  $    37  %    38  &    39  '  */
+        0,       1,       1,       0,       1,       1,       1,       1,
+/*  40  (    41  )    42  *    43  +    44  ,    45  -    46  .    47  /  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  48  0    49  1    50  2    51  3    52  4    53  5    54  6    55  7  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  56  8    57  9    58  :    59  ;    60  <    61  =    62  >    63  ?  */
+        1,       1,       1,       1,       1,       1,       1,       0,
+/*  64  @    65  A    66  B    67  C    68  D    69  E    70  F    71  G  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  72  H    73  I    74  J    75  K    76  L    77  M    78  N    79  O  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  80  P    81  Q    82  R    83  S    84  T    85  U    86  V    87  W  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  88  X    89  Y    90  Z    91  [    92  \    93  ]    94  ^    95  _  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/*  96  `    97  a    98  b    99  c   100  d   101  e   102  f   103  g  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/* 104  h   105  i   106  j   107  k   108  l   109  m   110  n   111  o  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/* 112  p   113  q   114  r   115  s   116  t   117  u   118  v   119  w  */
+        1,       1,       1,       1,       1,       1,       1,       1,
+/* 120  x   121  y   122  z   123  {   124  |   125  }   126  ~   127 del */
+        1,       1,       1,       1,       1,       1,       1,       0, };
+
+
+enum state
+  { s_dead = 1 /* important that this is > 0 */
+
+  , s_start_req_or_res
+  , s_res_or_resp_H
+  , s_start_res
+  , s_res_H
+  , s_res_HT
+  , s_res_HTT
+  , s_res_HTTP
+  , s_res_first_http_major
+  , s_res_http_major
+  , s_res_first_http_minor
+  , s_res_http_minor
+  , s_res_first_status_code
+  , s_res_status_code
+  , s_res_status
+  , s_res_line_almost_done
+
+  , s_start_req
+
+  , s_req_method
+  , s_req_spaces_before_url
+  , s_req_schema
+  , s_req_schema_slash
+  , s_req_schema_slash_slash
+  , s_req_host
+  , s_req_port
+  , s_req_path
+  , s_req_query_string_start
+  , s_req_query_string
+  , s_req_fragment_start
+  , s_req_fragment
+  , s_req_http_start
+  , s_req_http_H
+  , s_req_http_HT
+  , s_req_http_HTT
+  , s_req_http_HTTP
+  , s_req_first_http_major
+  , s_req_http_major
+  , s_req_first_http_minor
+  , s_req_http_minor
+  , s_req_line_almost_done
+
+  , s_header_field_start
+  , s_header_field
+  , s_header_value_start
+  , s_header_value
+  , s_header_value_lws
+
+  , s_header_almost_done
+
+  , s_chunk_size_start
+  , s_chunk_size
+  , s_chunk_parameters
+  , s_chunk_size_almost_done
+  
+  , s_headers_almost_done
+  /* Important: 's_headers_almost_done' must be the last 'header' state. All
+   * states beyond this must be 'body' states. It is used for overflow
+   * checking. See the PARSING_HEADER() macro.
+   */
+
+  , s_chunk_data
+  , s_chunk_data_almost_done
+  , s_chunk_data_done
+
+  , s_body_identity
+  , s_body_identity_eof
+  };
+
+
+#define PARSING_HEADER(state) (state <= s_headers_almost_done)
+
+
+enum header_states
+  { h_general = 0
+  , h_C
+  , h_CO
+  , h_CON
+
+  , h_matching_connection
+  , h_matching_proxy_connection
+  , h_matching_content_length
+  , h_matching_transfer_encoding
+  , h_matching_upgrade
+
+  , h_connection
+  , h_content_length
+  , h_transfer_encoding
+  , h_upgrade
+
+  , h_matching_transfer_encoding_chunked
+  , h_matching_connection_keep_alive
+  , h_matching_connection_close
+
+  , h_transfer_encoding_chunked
+  , h_connection_keep_alive
+  , h_connection_close
+  };
+
+
+/* Macros for character classes; depends on strict-mode  */
+#define CR                  '\r'
+#define LF                  '\n'
+#define LOWER(c)            (unsigned char)(c | 0x20)
+#define TOKEN(c)            (tokens[(unsigned char)c])
+#define IS_ALPHA(c)         (LOWER(c) >= 'a' && LOWER(c) <= 'z')
+#define IS_NUM(c)           ((c) >= '0' && (c) <= '9')
+#define IS_ALPHANUM(c)      (IS_ALPHA(c) || IS_NUM(c))
+
+#if HTTP_PARSER_STRICT
+#define IS_URL_CHAR(c)      (normal_url_char[(unsigned char) (c)])
+#define IS_HOST_CHAR(c)     (IS_ALPHANUM(c) || (c) == '.' || (c) == '-')
+#else
+#define IS_URL_CHAR(c)                                                         \
+  (normal_url_char[(unsigned char) (c)] || ((c) & 0x80))
+#define IS_HOST_CHAR(c)                                                        \
+  (IS_ALPHANUM(c) || (c) == '.' || (c) == '-' || (c) == '_')
+#endif
+
+
+#define start_state (parser->type == HTTP_REQUEST ? s_start_req : s_start_res)
+
+
+#if HTTP_PARSER_STRICT
+# define STRICT_CHECK(cond)                                          \
+do {                                                                 \
+  if (cond) {                                                        \
+    SET_ERRNO(HPE_STRICT);                                           \
+    goto error;                                                      \
+  }                                                                  \
+} while (0)
+# define NEW_MESSAGE() (http_should_keep_alive(parser) ? start_state : s_dead)
+#else
+# define STRICT_CHECK(cond)
+# define NEW_MESSAGE() start_state
+#endif
+
+
+/* Map errno values to strings for human-readable output */
+#define HTTP_STRERROR_GEN(n, s) { "HPE_" #n, s },
+static struct {
+  const char *name;
+  const char *description;
+} http_strerror_tab[] = {
+  HTTP_ERRNO_MAP(HTTP_STRERROR_GEN)
+};
+#undef HTTP_STRERROR_GEN
+
+
+size_t http_parser_execute (http_parser *parser,
+                            const http_parser_settings *settings,
+                            const char *data,
+                            size_t len)
+{
+  char c, ch;
+  int8_t unhex_val;
+  const char *p = data, *pe;
+  int64_t to_read;
+  enum state state;
+  enum header_states header_state;
+  uint64_t index = parser->index;
+  uint64_t nread = parser->nread;
+
+  /* We're in an error state. Don't bother doing anything. */
+  if (HTTP_PARSER_ERRNO(parser) != HPE_OK) {
+    return 0;
+  }
+
+  state = (enum state) parser->state;
+  header_state = (enum header_states) parser->header_state;
+
+  if (len == 0) {
+    switch (state) {
+      case s_body_identity_eof:
+        CALLBACK2(message_complete);
+        return 0;
+
+      case s_dead:
+      case s_start_req_or_res:
+      case s_start_res:
+      case s_start_req:
+        return 0;
+
+      default:
+        SET_ERRNO(HPE_INVALID_EOF_STATE);
+        return 1;
+    }
+  }
+
+  /* technically we could combine all of these (except for url_mark) into one
+     variable, saving stack space, but it seems more clear to have them
+     separated. */
+  const char *header_field_mark = 0;
+  const char *header_value_mark = 0;
+  const char *url_mark = 0;
+
+  if (state == s_header_field)
+    header_field_mark = data;
+  if (state == s_header_value)
+    header_value_mark = data;
+  if (state == s_req_path || state == s_req_schema || state == s_req_schema_slash
+      || state == s_req_schema_slash_slash || state == s_req_port
+      || state == s_req_query_string_start || state == s_req_query_string
+      || state == s_req_host
+      || state == s_req_fragment_start || state == s_req_fragment)
+    url_mark = data;
+
+  for (p=data, pe=data+len; p != pe; p++) {
+    ch = *p;
+
+    if (PARSING_HEADER(state)) {
+      ++nread;
+      /* Buffer overflow attack */
+      if (nread > HTTP_MAX_HEADER_SIZE) {
+        SET_ERRNO(HPE_HEADER_OVERFLOW);
+        goto error;
+      }
+    }
+
+    switch (state) {
+
+      case s_dead:
+        /* this state is used after a 'Connection: close' message
+         * the parser will error out if it reads another message
+         */
+        SET_ERRNO(HPE_CLOSED_CONNECTION);
+        goto error;
+
+      case s_start_req_or_res:
+      {
+        if (ch == CR || ch == LF)
+          break;
+        parser->flags = 0;
+        parser->content_length = -1;
+
+        CALLBACK2(message_begin);
+
+        if (ch == 'H')
+          state = s_res_or_resp_H;
+        else {
+          parser->type = HTTP_REQUEST;
+          goto start_req_method_assign;
+        }
+        break;
+      }
+
+      case s_res_or_resp_H:
+        if (ch == 'T') {
+          parser->type = HTTP_RESPONSE;
+          state = s_res_HT;
+        } else {
+          if (ch != 'E') {
+            SET_ERRNO(HPE_INVALID_CONSTANT);
+            goto error;
+          }
+
+          parser->type = HTTP_REQUEST;
+          parser->method = HTTP_HEAD;
+          index = 2;
+          state = s_req_method;
+        }
+        break;
+
+      case s_start_res:
+      {
+        parser->flags = 0;
+        parser->content_length = -1;
+
+        CALLBACK2(message_begin);
+
+        switch (ch) {
+          case 'H':
+            state = s_res_H;
+            break;
+
+          case CR:
+          case LF:
+            break;
+
+          default:
+            SET_ERRNO(HPE_INVALID_CONSTANT);
+            goto error;
+        }
+        break;
+      }
+
+      case s_res_H:
+        STRICT_CHECK(ch != 'T');
+        state = s_res_HT;
+        break;
+
+      case s_res_HT:
+        STRICT_CHECK(ch != 'T');
+        state = s_res_HTT;
+        break;
+
+      case s_res_HTT:
+        STRICT_CHECK(ch != 'P');
+        state = s_res_HTTP;
+        break;
+
+      case s_res_HTTP:
+        STRICT_CHECK(ch != '/');
+        state = s_res_first_http_major;
+        break;
+
+      case s_res_first_http_major:
+        if (ch < '1' || ch > '9') {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_major = ch - '0';
+        state = s_res_http_major;
+        break;
+
+      /* major HTTP version or dot */
+      case s_res_http_major:
+      {
+        if (ch == '.') {
+          state = s_res_first_http_minor;
+          break;
+        }
+
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_major *= 10;
+        parser->http_major += ch - '0';
+
+        if (parser->http_major > 999) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        break;
+      }
+
+      /* first digit of minor HTTP version */
+      case s_res_first_http_minor:
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_minor = ch - '0';
+        state = s_res_http_minor;
+        break;
+
+      /* minor HTTP version or end of request line */
+      case s_res_http_minor:
+      {
+        if (ch == ' ') {
+          state = s_res_first_status_code;
+          break;
+        }
+
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_minor *= 10;
+        parser->http_minor += ch - '0';
+
+        if (parser->http_minor > 999) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        break;
+      }
+
+      case s_res_first_status_code:
+      {
+        if (!IS_NUM(ch)) {
+          if (ch == ' ') {
+            break;
+          }
+
+          SET_ERRNO(HPE_INVALID_STATUS);
+          goto error;
+        }
+        parser->status_code = ch - '0';
+        state = s_res_status_code;
+        break;
+      }
+
+      case s_res_status_code:
+      {
+        if (!IS_NUM(ch)) {
+          switch (ch) {
+            case ' ':
+              state = s_res_status;
+              break;
+            case CR:
+              state = s_res_line_almost_done;
+              break;
+            case LF:
+              state = s_header_field_start;
+              break;
+            default:
+              SET_ERRNO(HPE_INVALID_STATUS);
+              goto error;
+          }
+          break;
+        }
+
+        parser->status_code *= 10;
+        parser->status_code += ch - '0';
+
+        if (parser->status_code > 999) {
+          SET_ERRNO(HPE_INVALID_STATUS);
+          goto error;
+        }
+
+        break;
+      }
+
+      case s_res_status:
+        /* the human readable status. e.g. "NOT FOUND"
+         * we are not humans so just ignore this */
+        if (ch == CR) {
+          state = s_res_line_almost_done;
+          break;
+        }
+
+        if (ch == LF) {
+          state = s_header_field_start;
+          break;
+        }
+        break;
+
+      case s_res_line_almost_done:
+        STRICT_CHECK(ch != LF);
+        state = s_header_field_start;
+        break;
+
+      case s_start_req:
+      {
+        if (ch == CR || ch == LF)
+          break;
+        parser->flags = 0;
+        parser->content_length = -1;
+
+        CALLBACK2(message_begin);
+
+        if (!IS_ALPHA(ch)) {
+          SET_ERRNO(HPE_INVALID_METHOD);
+          goto error;
+        }
+
+      start_req_method_assign:
+        parser->method = (enum http_method) 0;
+        index = 1;
+        switch (ch) {
+          case 'C': parser->method = HTTP_CONNECT; /* or COPY, CHECKOUT */ break;
+          case 'D': parser->method = HTTP_DELETE; break;
+          case 'G': parser->method = HTTP_GET; break;
+          case 'H': parser->method = HTTP_HEAD; break;
+          case 'L': parser->method = HTTP_LOCK; break;
+          case 'M': parser->method = HTTP_MKCOL; /* or MOVE, MKACTIVITY, MERGE, M-SEARCH */ break;
+          case 'N': parser->method = HTTP_NOTIFY; break;
+          case 'O': parser->method = HTTP_OPTIONS; break;
+          case 'P': parser->method = HTTP_POST;
+            /* or PROPFIND or PROPPATCH or PUT or PATCH */
+            break;
+          case 'R': parser->method = HTTP_REPORT; break;
+          case 'S': parser->method = HTTP_SUBSCRIBE; break;
+          case 'T': parser->method = HTTP_TRACE; break;
+          case 'U': parser->method = HTTP_UNLOCK; /* or UNSUBSCRIBE */ break;
+          default:
+            SET_ERRNO(HPE_INVALID_METHOD);
+            goto error;
+        }
+        state = s_req_method;
+        break;
+      }
+
+      case s_req_method:
+      {
+        if (ch == '\0') {
+          SET_ERRNO(HPE_INVALID_METHOD);
+          goto error;
+        }
+
+        const char *matcher = method_strings[parser->method];
+        if (ch == ' ' && matcher[index] == '\0') {
+          state = s_req_spaces_before_url;
+        } else if (ch == matcher[index]) {
+          ; /* nada */
+        } else if (parser->method == HTTP_CONNECT) {
+          if (index == 1 && ch == 'H') {
+            parser->method = HTTP_CHECKOUT;
+          } else if (index == 2  && ch == 'P') {
+            parser->method = HTTP_COPY;
+          } else {
+            goto error;
+          }
+        } else if (parser->method == HTTP_MKCOL) {
+          if (index == 1 && ch == 'O') {
+            parser->method = HTTP_MOVE;
+          } else if (index == 1 && ch == 'E') {
+            parser->method = HTTP_MERGE;
+          } else if (index == 1 && ch == '-') {
+            parser->method = HTTP_MSEARCH;
+          } else if (index == 2 && ch == 'A') {
+            parser->method = HTTP_MKACTIVITY;
+          } else {
+            goto error;
+          }
+        } else if (index == 1 && parser->method == HTTP_POST) {
+          if (ch == 'R') {
+            parser->method = HTTP_PROPFIND; /* or HTTP_PROPPATCH */
+          } else if (ch == 'U') {
+            parser->method = HTTP_PUT;
+          } else if (ch == 'A') {
+            parser->method = HTTP_PATCH;
+          } else {
+            goto error;
+          }
+        } else if (index == 2 && parser->method == HTTP_UNLOCK && ch == 'S') {
+          parser->method = HTTP_UNSUBSCRIBE;
+        } else if (index == 4 && parser->method == HTTP_PROPFIND && ch == 'P') {
+          parser->method = HTTP_PROPPATCH;
+        } else {
+          SET_ERRNO(HPE_INVALID_METHOD);
+          goto error;
+        }
+
+        ++index;
+        break;
+      }
+      case s_req_spaces_before_url:
+      {
+        if (ch == ' ') break;
+
+        if (ch == '/' || ch == '*') {
+          MARK(url);
+          state = s_req_path;
+          break;
+        }
+
+        /* Proxied requests are followed by scheme of an absolute URI (alpha).
+         * CONNECT is followed by a hostname, which begins with alphanum.
+         * All other methods are followed by '/' or '*' (handled above).
+         */
+        if (IS_ALPHA(ch) || (parser->method == HTTP_CONNECT && IS_NUM(ch))) {
+          MARK(url);
+          state = (parser->method == HTTP_CONNECT) ? s_req_host : s_req_schema;
+          break;
+        }
+
+        SET_ERRNO(HPE_INVALID_URL);
+        goto error;
+      }
+
+      case s_req_schema:
+      {
+        if (IS_ALPHA(ch)) break;
+
+        if (ch == ':') {
+          state = s_req_schema_slash;
+          break;
+        }
+
+        SET_ERRNO(HPE_INVALID_URL);
+        goto error;
+      }
+
+      case s_req_schema_slash:
+        STRICT_CHECK(ch != '/');
+        state = s_req_schema_slash_slash;
+        break;
+
+      case s_req_schema_slash_slash:
+        STRICT_CHECK(ch != '/');
+        state = s_req_host;
+        break;
+
+      case s_req_host:
+      {
+        if (IS_HOST_CHAR(ch)) break;
+        switch (ch) {
+          case ':':
+            state = s_req_port;
+            break;
+          case '/':
+            state = s_req_path;
+            break;
+          case ' ':
+            /* The request line looks like:
+             *   "GET http://foo.bar.com HTTP/1.1"
+             * That is, there is no path.
+             */
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case '?':
+            state = s_req_query_string_start;
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_HOST);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_port:
+      {
+        if (IS_NUM(ch)) break;
+        switch (ch) {
+          case '/':
+            state = s_req_path;
+            break;
+          case ' ':
+            /* The request line looks like:
+             *   "GET http://foo.bar.com:1234 HTTP/1.1"
+             * That is, there is no path.
+             */
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case '?':
+            state = s_req_query_string_start;
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_PORT);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_path:
+      {
+        if (IS_URL_CHAR(ch)) break;
+
+        switch (ch) {
+          case ' ':
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case CR:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_req_line_almost_done;
+            break;
+          case LF:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_header_field_start;
+            break;
+          case '?':
+            state = s_req_query_string_start;
+            break;
+          case '#':
+            state = s_req_fragment_start;
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_PATH);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_query_string_start:
+      {
+        if (IS_URL_CHAR(ch)) {
+          state = s_req_query_string;
+          break;
+        }
+
+        switch (ch) {
+          case '?':
+            break; /* XXX ignore extra '?' ... is this right? */
+          case ' ':
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case CR:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_req_line_almost_done;
+            break;
+          case LF:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_header_field_start;
+            break;
+          case '#':
+            state = s_req_fragment_start;
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_QUERY_STRING);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_query_string:
+      {
+        if (IS_URL_CHAR(ch)) break;
+
+        switch (ch) {
+          case '?':
+            /* allow extra '?' in query string */
+            break;
+          case ' ':
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case CR:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_req_line_almost_done;
+            break;
+          case LF:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_header_field_start;
+            break;
+          case '#':
+            state = s_req_fragment_start;
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_QUERY_STRING);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_fragment_start:
+      {
+        if (IS_URL_CHAR(ch)) {
+          state = s_req_fragment;
+          break;
+        }
+
+        switch (ch) {
+          case ' ':
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case CR:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_req_line_almost_done;
+            break;
+          case LF:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_header_field_start;
+            break;
+          case '?':
+            state = s_req_fragment;
+            break;
+          case '#':
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_FRAGMENT);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_fragment:
+      {
+        if (IS_URL_CHAR(ch)) break;
+
+        switch (ch) {
+          case ' ':
+            CALLBACK(url);
+            state = s_req_http_start;
+            break;
+          case CR:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_req_line_almost_done;
+            break;
+          case LF:
+            CALLBACK(url);
+            parser->http_major = 0;
+            parser->http_minor = 9;
+            state = s_header_field_start;
+            break;
+          case '?':
+          case '#':
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_FRAGMENT);
+            goto error;
+        }
+        break;
+      }
+
+      case s_req_http_start:
+        switch (ch) {
+          case 'H':
+            state = s_req_http_H;
+            break;
+          case ' ':
+            break;
+          default:
+            SET_ERRNO(HPE_INVALID_CONSTANT);
+            goto error;
+        }
+        break;
+
+      case s_req_http_H:
+        STRICT_CHECK(ch != 'T');
+        state = s_req_http_HT;
+        break;
+
+      case s_req_http_HT:
+        STRICT_CHECK(ch != 'T');
+        state = s_req_http_HTT;
+        break;
+
+      case s_req_http_HTT:
+        STRICT_CHECK(ch != 'P');
+        state = s_req_http_HTTP;
+        break;
+
+      case s_req_http_HTTP:
+        STRICT_CHECK(ch != '/');
+        state = s_req_first_http_major;
+        break;
+
+      /* first digit of major HTTP version */
+      case s_req_first_http_major:
+        if (ch < '1' || ch > '9') {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_major = ch - '0';
+        state = s_req_http_major;
+        break;
+
+      /* major HTTP version or dot */
+      case s_req_http_major:
+      {
+        if (ch == '.') {
+          state = s_req_first_http_minor;
+          break;
+        }
+
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_major *= 10;
+        parser->http_major += ch - '0';
+
+        if (parser->http_major > 999) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        break;
+      }
+
+      /* first digit of minor HTTP version */
+      case s_req_first_http_minor:
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_minor = ch - '0';
+        state = s_req_http_minor;
+        break;
+
+      /* minor HTTP version or end of request line */
+      case s_req_http_minor:
+      {
+        if (ch == CR) {
+          state = s_req_line_almost_done;
+          break;
+        }
+
+        if (ch == LF) {
+          state = s_header_field_start;
+          break;
+        }
+
+        /* XXX allow spaces after digit? */
+
+        if (!IS_NUM(ch)) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        parser->http_minor *= 10;
+        parser->http_minor += ch - '0';
+
+        if (parser->http_minor > 999) {
+          SET_ERRNO(HPE_INVALID_VERSION);
+          goto error;
+        }
+
+        break;
+      }
+
+      /* end of request line */
+      case s_req_line_almost_done:
+      {
+        if (ch != LF) {
+          SET_ERRNO(HPE_LF_EXPECTED);
+          goto error;
+        }
+
+        state = s_header_field_start;
+        break;
+      }
+
+      case s_header_field_start:
+      header_field_start:
+      {
+        if (ch == CR) {
+          state = s_headers_almost_done;
+          break;
+        }
+
+        if (ch == LF) {
+          /* they might be just sending \n instead of \r\n so this would be
+           * the second \n to denote the end of headers*/
+          state = s_headers_almost_done;
+          goto headers_almost_done;
+        }
+
+        c = TOKEN(ch);
+
+        if (!c) {
+          SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
+          goto error;
+        }
+
+        MARK(header_field);
+
+        index = 0;
+        state = s_header_field;
+
+        switch (c) {
+          case 'c':
+            header_state = h_C;
+            break;
+
+          case 'p':
+            header_state = h_matching_proxy_connection;
+            break;
+
+          case 't':
+            header_state = h_matching_transfer_encoding;
+            break;
+
+          case 'u':
+            header_state = h_matching_upgrade;
+            break;
+
+          default:
+            header_state = h_general;
+            break;
+        }
+        break;
+      }
+
+      case s_header_field:
+      {
+        c = TOKEN(ch);
+
+        if (c) {
+          switch (header_state) {
+            case h_general:
+              break;
+
+            case h_C:
+              index++;
+              header_state = (c == 'o' ? h_CO : h_general);
+              break;
+
+            case h_CO:
+              index++;
+              header_state = (c == 'n' ? h_CON : h_general);
+              break;
+
+            case h_CON:
+              index++;
+              switch (c) {
+                case 'n':
+                  header_state = h_matching_connection;
+                  break;
+                case 't':
+                  header_state = h_matching_content_length;
+                  break;
+                default:
+                  header_state = h_general;
+                  break;
+              }
+              break;
+
+            /* connection */
+
+            case h_matching_connection:
+              index++;
+              if (index > sizeof(CONNECTION)-1
+                  || c != CONNECTION[index]) {
+                header_state = h_general;
+              } else if (index == sizeof(CONNECTION)-2) {
+                header_state = h_connection;
+              }
+              break;
+
+            /* proxy-connection */
+
+            case h_matching_proxy_connection:
+              index++;
+              if (index > sizeof(PROXY_CONNECTION)-1
+                  || c != PROXY_CONNECTION[index]) {
+                header_state = h_general;
+              } else if (index == sizeof(PROXY_CONNECTION)-2) {
+                header_state = h_connection;
+              }
+              break;
+
+            /* content-length */
+
+            case h_matching_content_length:
+              index++;
+              if (index > sizeof(CONTENT_LENGTH)-1
+                  || c != CONTENT_LENGTH[index]) {
+                header_state = h_general;
+              } else if (index == sizeof(CONTENT_LENGTH)-2) {
+                header_state = h_content_length;
+              }
+              break;
+
+            /* transfer-encoding */
+
+            case h_matching_transfer_encoding:
+              index++;
+              if (index > sizeof(TRANSFER_ENCODING)-1
+                  || c != TRANSFER_ENCODING[index]) {
+                header_state = h_general;
+              } else if (index == sizeof(TRANSFER_ENCODING)-2) {
+                header_state = h_transfer_encoding;
+              }
+              break;
+
+            /* upgrade */
+
+            case h_matching_upgrade:
+              index++;
+              if (index > sizeof(UPGRADE)-1
+                  || c != UPGRADE[index]) {
+                header_state = h_general;
+              } else if (index == sizeof(UPGRADE)-2) {
+                header_state = h_upgrade;
+              }
+              break;
+
+            case h_connection:
+            case h_content_length:
+            case h_transfer_encoding:
+            case h_upgrade:
+              if (ch != ' ') header_state = h_general;
+              break;
+
+            default:
+              assert(0 && "Unknown header_state");
+              break;
+          }
+          break;
+        }
+
+        if (ch == ':') {
+          CALLBACK(header_field);
+          state = s_header_value_start;
+          break;
+        }
+
+        if (ch == CR) {
+          state = s_header_almost_done;
+          CALLBACK(header_field);
+          break;
+        }
+
+        if (ch == LF) {
+          CALLBACK(header_field);
+          state = s_header_field_start;
+          break;
+        }
+
+        SET_ERRNO(HPE_INVALID_HEADER_TOKEN);
+        goto error;
+      }
+
+      case s_header_value_start:
+      {
+        if (ch == ' ' || ch == '\t') break;
+
+        MARK(header_value);
+
+        state = s_header_value;
+        index = 0;
+
+        if (ch == CR) {
+          CALLBACK(header_value);
+          header_state = h_general;
+          state = s_header_almost_done;
+          break;
+        }
+
+        if (ch == LF) {
+          CALLBACK(header_value);
+          state = s_header_field_start;
+          break;
+        }
+
+        c = LOWER(ch);
+
+        switch (header_state) {
+          case h_upgrade:
+            parser->flags |= F_UPGRADE;
+            header_state = h_general;
+            break;
+
+          case h_transfer_encoding:
+            /* looking for 'Transfer-Encoding: chunked' */
+            if ('c' == c) {
+              header_state = h_matching_transfer_encoding_chunked;
+            } else {
+              header_state = h_general;
+            }
+            break;
+
+          case h_content_length:
+            if (!IS_NUM(ch)) {
+              SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
+              goto error;
+            }
+
+            parser->content_length = ch - '0';
+            break;
+
+          case h_connection:
+            /* looking for 'Connection: keep-alive' */
+            if (c == 'k') {
+              header_state = h_matching_connection_keep_alive;
+            /* looking for 'Connection: close' */
+            } else if (c == 'c') {
+              header_state = h_matching_connection_close;
+            } else {
+              header_state = h_general;
+            }
+            break;
+
+          default:
+            header_state = h_general;
+            break;
+        }
+        break;
+      }
+
+      case s_header_value:
+      {
+
+        if (ch == CR) {
+          CALLBACK(header_value);
+          state = s_header_almost_done;
+          break;
+        }
+
+        if (ch == LF) {
+          CALLBACK(header_value);
+          goto header_almost_done;
+        }
+
+        c = LOWER(ch);
+
+        switch (header_state) {
+          case h_general:
+            break;
+
+          case h_connection:
+          case h_transfer_encoding:
+            assert(0 && "Shouldn't get here.");
+            break;
+
+          case h_content_length:
+            if (ch == ' ') break;
+            if (!IS_NUM(ch)) {
+              SET_ERRNO(HPE_INVALID_CONTENT_LENGTH);
+              goto error;
+            }
+
+            parser->content_length *= 10;
+            parser->content_length += ch - '0';
+            break;
+
+          /* Transfer-Encoding: chunked */
+          case h_matching_transfer_encoding_chunked:
+            index++;
+            if (index > sizeof(CHUNKED)-1
+                || c != CHUNKED[index]) {
+              header_state = h_general;
+            } else if (index == sizeof(CHUNKED)-2) {
+              header_state = h_transfer_encoding_chunked;
+            }
+            break;
+
+          /* looking for 'Connection: keep-alive' */
+          case h_matching_connection_keep_alive:
+            index++;
+            if (index > sizeof(KEEP_ALIVE)-1
+                || c != KEEP_ALIVE[index]) {
+              header_state = h_general;
+            } else if (index == sizeof(KEEP_ALIVE)-2) {
+              header_state = h_connection_keep_alive;
+            }
+            break;
+
+          /* looking for 'Connection: close' */
+          case h_matching_connection_close:
+            index++;
+            if (index > sizeof(CLOSE)-1 || c != CLOSE[index]) {
+              header_state = h_general;
+            } else if (index == sizeof(CLOSE)-2) {
+              header_state = h_connection_close;
+            }
+            break;
+
+          case h_transfer_encoding_chunked:
+          case h_connection_keep_alive:
+          case h_connection_close:
+            if (ch != ' ') header_state = h_general;
+            break;
+
+          default:
+            state = s_header_value;
+            header_state = h_general;
+            break;
+        }
+        break;
+      }
+
+      case s_header_almost_done:
+      header_almost_done:
+      {
+        STRICT_CHECK(ch != LF);
+
+        state = s_header_value_lws;
+
+        switch (header_state) {
+          case h_connection_keep_alive:
+            parser->flags |= F_CONNECTION_KEEP_ALIVE;
+            break;
+          case h_connection_close:
+            parser->flags |= F_CONNECTION_CLOSE;
+            break;
+          case h_transfer_encoding_chunked:
+            parser->flags |= F_CHUNKED;
+            break;
+          default:
+            break;
+        }
+        break;
+      }
+
+      case s_header_value_lws:
+      {
+        if (ch == ' ' || ch == '\t')
+          state = s_header_value_start;
+        else
+        {
+          state = s_header_field_start;
+          goto header_field_start;
+        }
+        break;
+      }
+
+      case s_headers_almost_done:
+      headers_almost_done:
+      {
+        STRICT_CHECK(ch != LF);
+
+        if (parser->flags & F_TRAILING) {
+          /* End of a chunked request */
+          CALLBACK2(message_complete);
+          state = NEW_MESSAGE();
+          break;
+        }
+
+        nread = 0;
+
+        if (parser->flags & F_UPGRADE || parser->method == HTTP_CONNECT) {
+          parser->upgrade = 1;
+        }
+
+        /* Here we call the headers_complete callback. This is somewhat
+         * different than other callbacks because if the user returns 1, we
+         * will interpret that as saying that this message has no body. This
+         * is needed for the annoying case of recieving a response to a HEAD
+         * request.
+         */
+        if (settings->on_headers_complete) {
+          switch (settings->on_headers_complete(parser)) {
+            case 0:
+              break;
+
+            case 1:
+              parser->flags |= F_SKIPBODY;
+              break;
+
+            default:
+              parser->state = state;
+              SET_ERRNO(HPE_CB_headers_complete);
+              return p - data; /* Error */
+          }
+        }
+
+        /* Exit, the rest of the connect is in a different protocol. */
+        if (parser->upgrade) {
+          CALLBACK2(message_complete);
+          return (p - data) + 1;
+        }
+
+        if (parser->flags & F_SKIPBODY) {
+          CALLBACK2(message_complete);
+          state = NEW_MESSAGE();
+        } else if (parser->flags & F_CHUNKED) {
+          /* chunked encoding - ignore Content-Length header */
+          state = s_chunk_size_start;
+        } else {
+          if (parser->content_length == 0) {
+            /* Content-Length header given but zero: Content-Length: 0\r\n */
+            CALLBACK2(message_complete);
+            state = NEW_MESSAGE();
+          } else if (parser->content_length > 0) {
+            /* Content-Length header given and non-zero */
+            state = s_body_identity;
+          } else {
+            if (parser->type == HTTP_REQUEST || http_should_keep_alive(parser)) {
+              /* Assume content-length 0 - read the next */
+              CALLBACK2(message_complete);
+              state = NEW_MESSAGE();
+            } else {
+              /* Read body until EOF */
+              state = s_body_identity_eof;
+            }
+          }
+        }
+
+        break;
+      }
+
+      case s_body_identity:
+        to_read = MIN(pe - p, (int64_t)parser->content_length);
+        if (to_read > 0) {
+          if (settings->on_body) settings->on_body(parser, p, to_read);
+          p += to_read - 1;
+          parser->content_length -= to_read;
+          if (parser->content_length == 0) {
+            CALLBACK2(message_complete);
+            state = NEW_MESSAGE();
+          }
+        }
+        break;
+
+      /* read until EOF */
+      case s_body_identity_eof:
+        to_read = pe - p;
+        if (to_read > 0) {
+          if (settings->on_body) settings->on_body(parser, p, to_read);
+          p += to_read - 1;
+        }
+        break;
+
+      case s_chunk_size_start:
+      {
+        assert(nread == 1);
+        assert(parser->flags & F_CHUNKED);
+
+        unhex_val = unhex[(unsigned char)ch];
+        if (unhex_val == -1) {
+          SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
+          goto error;
+        }
+
+        parser->content_length = unhex_val;
+        state = s_chunk_size;
+        break;
+      }
+
+      case s_chunk_size:
+      {
+        assert(parser->flags & F_CHUNKED);
+
+        if (ch == CR) {
+          state = s_chunk_size_almost_done;
+          break;
+        }
+
+        unhex_val = unhex[(unsigned char)ch];
+
+        if (unhex_val == -1) {
+          if (ch == ';' || ch == ' ') {
+            state = s_chunk_parameters;
+            break;
+          }
+
+          SET_ERRNO(HPE_INVALID_CHUNK_SIZE);
+          goto error;
+        }
+
+        parser->content_length *= 16;
+        parser->content_length += unhex_val;
+        break;
+      }
+
+      case s_chunk_parameters:
+      {
+        assert(parser->flags & F_CHUNKED);
+        /* just ignore this shit. TODO check for overflow */
+        if (ch == CR) {
+          state = s_chunk_size_almost_done;
+          break;
+        }
+        break;
+      }
+
+      case s_chunk_size_almost_done:
+      {
+        assert(parser->flags & F_CHUNKED);
+        STRICT_CHECK(ch != LF);
+
+        nread = 0;
+
+        if (parser->content_length == 0) {
+          parser->flags |= F_TRAILING;
+          state = s_header_field_start;
+        } else {
+          state = s_chunk_data;
+        }
+        break;
+      }
+
+      case s_chunk_data:
+      {
+        assert(parser->flags & F_CHUNKED);
+
+        to_read = MIN(pe - p, (int64_t)(parser->content_length));
+
+        if (to_read > 0) {
+          if (settings->on_body) settings->on_body(parser, p, to_read);
+          p += to_read - 1;
+        }
+
+        if (to_read == parser->content_length) {
+          state = s_chunk_data_almost_done;
+        }
+
+        parser->content_length -= to_read;
+        break;
+      }
+
+      case s_chunk_data_almost_done:
+        assert(parser->flags & F_CHUNKED);
+        STRICT_CHECK(ch != CR);
+        state = s_chunk_data_done;
+        break;
+
+      case s_chunk_data_done:
+        assert(parser->flags & F_CHUNKED);
+        STRICT_CHECK(ch != LF);
+        state = s_chunk_size_start;
+        break;
+
+      default:
+        assert(0 && "unhandled state");
+        SET_ERRNO(HPE_INVALID_INTERNAL_STATE);
+        goto error;
+    }
+  }
+
+  CALLBACK(header_field);
+  CALLBACK(header_value);
+  CALLBACK(url);
+
+  parser->state = state;
+  parser->header_state = header_state;
+  parser->index = index;
+  parser->nread = nread;
+
+  return len;
+
+error:
+  if (HTTP_PARSER_ERRNO(parser) == HPE_OK) {
+    SET_ERRNO(HPE_UNKNOWN);
+  }
+
+  return (p - data);
+}
+
+
+int
+http_should_keep_alive (http_parser *parser)
+{
+  if (parser->http_major > 0 && parser->http_minor > 0) {
+    /* HTTP/1.1 */
+    if (parser->flags & F_CONNECTION_CLOSE) {
+      return 0;
+    } else {
+      return 1;
+    }
+  } else {
+    /* HTTP/1.0 or earlier */
+    if (parser->flags & F_CONNECTION_KEEP_ALIVE) {
+      return 1;
+    } else {
+      return 0;
+    }
+  }
+}
+
+
+const char * http_method_str (enum http_method m)
+{
+  return method_strings[m];
+}
+
+
+void
+http_parser_init (http_parser *parser, enum http_parser_type t)
+{
+  parser->type = t;
+  parser->state = (t == HTTP_REQUEST ? s_start_req : (t == HTTP_RESPONSE ? s_start_res : s_start_req_or_res));
+  parser->nread = 0;
+  parser->upgrade = 0;
+  parser->flags = 0;
+  parser->method = 0;
+  parser->http_errno = 0;
+}
+
+const char *
+http_errno_name(enum http_errno err) {
+  assert(err < (sizeof(http_strerror_tab)/sizeof(http_strerror_tab[0])));
+  return http_strerror_tab[err].name;
+}
+
+const char *
+http_errno_description(enum http_errno err) {
+  assert(err < (sizeof(http_strerror_tab)/sizeof(http_strerror_tab[0])));
+  return http_strerror_tab[err].description;
+}
diff --git a/deps/http-parser/http_parser.h b/deps/http-parser/http_parser.h
new file mode 100644
index 000000000..76a61f26b
--- /dev/null
+++ b/deps/http-parser/http_parser.h
@@ -0,0 +1,276 @@
+/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+#ifndef http_parser_h
+#define http_parser_h
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define HTTP_PARSER_VERSION_MAJOR 1
+#define HTTP_PARSER_VERSION_MINOR 0
+
+#include <sys/types.h>
+#if defined(_WIN32) && !defined(__MINGW32__) && !defined(_MSC_VER)
+typedef __int8 int8_t;
+typedef unsigned __int8 uint8_t;
+typedef __int16 int16_t;
+typedef unsigned __int16 uint16_t;
+typedef __int32 int32_t;
+typedef unsigned __int32 uint32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+
+typedef unsigned int size_t;
+typedef int ssize_t;
+#else
+#include <stdint.h>
+#endif
+
+/* Compile with -DHTTP_PARSER_STRICT=0 to make less checks, but run
+ * faster
+ */
+#ifndef HTTP_PARSER_STRICT
+# define HTTP_PARSER_STRICT 1
+#endif
+
+/* Compile with -DHTTP_PARSER_DEBUG=1 to add extra debugging information to
+ * the error reporting facility.
+ */
+#ifndef HTTP_PARSER_DEBUG
+# define HTTP_PARSER_DEBUG 0
+#endif
+
+
+/* Maximium header size allowed */
+#define HTTP_MAX_HEADER_SIZE (80*1024)
+
+
+typedef struct http_parser http_parser;
+typedef struct http_parser_settings http_parser_settings;
+typedef struct http_parser_result http_parser_result;
+
+
+/* Callbacks should return non-zero to indicate an error. The parser will
+ * then halt execution.
+ *
+ * The one exception is on_headers_complete. In a HTTP_RESPONSE parser
+ * returning '1' from on_headers_complete will tell the parser that it
+ * should not expect a body. This is used when receiving a response to a
+ * HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
+ * chunked' headers that indicate the presence of a body.
+ *
+ * http_data_cb does not return data chunks. It will be call arbitrarally
+ * many times for each string. E.G. you might get 10 callbacks for "on_path"
+ * each providing just a few characters more data.
+ */
+typedef int (*http_data_cb) (http_parser*, const char *at, size_t length);
+typedef int (*http_cb) (http_parser*);
+
+
+/* Request Methods */
+enum http_method
+  { HTTP_DELETE    = 0
+  , HTTP_GET
+  , HTTP_HEAD
+  , HTTP_POST
+  , HTTP_PUT
+  /* pathological */
+  , HTTP_CONNECT
+  , HTTP_OPTIONS
+  , HTTP_TRACE
+  /* webdav */
+  , HTTP_COPY
+  , HTTP_LOCK
+  , HTTP_MKCOL
+  , HTTP_MOVE
+  , HTTP_PROPFIND
+  , HTTP_PROPPATCH
+  , HTTP_UNLOCK
+  /* subversion */
+  , HTTP_REPORT
+  , HTTP_MKACTIVITY
+  , HTTP_CHECKOUT
+  , HTTP_MERGE
+  /* upnp */
+  , HTTP_MSEARCH
+  , HTTP_NOTIFY
+  , HTTP_SUBSCRIBE
+  , HTTP_UNSUBSCRIBE
+  /* RFC-5789 */
+  , HTTP_PATCH
+  };
+
+
+enum http_parser_type { HTTP_REQUEST, HTTP_RESPONSE, HTTP_BOTH };
+
+
+/* Flag values for http_parser.flags field */
+enum flags
+  { F_CHUNKED               = 1 << 0
+  , F_CONNECTION_KEEP_ALIVE = 1 << 1
+  , F_CONNECTION_CLOSE      = 1 << 2
+  , F_TRAILING              = 1 << 3
+  , F_UPGRADE               = 1 << 4
+  , F_SKIPBODY              = 1 << 5
+  };
+
+
+/* Map for errno-related constants
+ * 
+ * The provided argument should be a macro that takes 2 arguments.
+ */
+#define HTTP_ERRNO_MAP(XX)                                           \
+  /* No error */                                                     \
+  XX(OK, "success")                                                  \
+                                                                     \
+  /* Callback-related errors */                                      \
+  XX(CB_message_begin, "the on_message_begin callback failed")       \
+  XX(CB_path, "the on_path callback failed")                         \
+  XX(CB_query_string, "the on_query_string callback failed")         \
+  XX(CB_url, "the on_url callback failed")                           \
+  XX(CB_fragment, "the on_fragment callback failed")                 \
+  XX(CB_header_field, "the on_header_field callback failed")         \
+  XX(CB_header_value, "the on_header_value callback failed")         \
+  XX(CB_headers_complete, "the on_headers_complete callback failed") \
+  XX(CB_body, "the on_body callback failed")                         \
+  XX(CB_message_complete, "the on_message_complete callback failed") \
+                                                                     \
+  /* Parsing-related errors */                                       \
+  XX(INVALID_EOF_STATE, "stream ended at an unexpected time")        \
+  XX(HEADER_OVERFLOW,                                                \
+     "too many header bytes seen; overflow detected")                \
+  XX(CLOSED_CONNECTION,                                              \
+     "data received after completed connection: close message")      \
+  XX(INVALID_VERSION, "invalid HTTP version")                        \
+  XX(INVALID_STATUS, "invalid HTTP status code")                     \
+  XX(INVALID_METHOD, "invalid HTTP method")                          \
+  XX(INVALID_URL, "invalid URL")                                     \
+  XX(INVALID_HOST, "invalid host")                                   \
+  XX(INVALID_PORT, "invalid port")                                   \
+  XX(INVALID_PATH, "invalid path")                                   \
+  XX(INVALID_QUERY_STRING, "invalid query string")                   \
+  XX(INVALID_FRAGMENT, "invalid fragment")                           \
+  XX(LF_EXPECTED, "LF character expected")                           \
+  XX(INVALID_HEADER_TOKEN, "invalid character in header")            \
+  XX(INVALID_CONTENT_LENGTH,                                         \
+     "invalid character in content-length header")                   \
+  XX(INVALID_CHUNK_SIZE,                                             \
+     "invalid character in chunk size header")                       \
+  XX(INVALID_CONSTANT, "invalid constant string")                    \
+  XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state")\
+  XX(STRICT, "strict mode assertion failed")                         \
+  XX(UNKNOWN, "an unknown error occurred")
+
+
+/* Define HPE_* values for each errno value above */
+#define HTTP_ERRNO_GEN(n, s) HPE_##n,
+enum http_errno {
+  HTTP_ERRNO_MAP(HTTP_ERRNO_GEN)
+};
+#undef HTTP_ERRNO_GEN
+
+
+/* Get an http_errno value from an http_parser */
+#define HTTP_PARSER_ERRNO(p)            ((enum http_errno) (p)->http_errno)
+
+/* Get the line number that generated the current error */
+#if HTTP_PARSER_DEBUG
+#define HTTP_PARSER_ERRNO_LINE(p)       ((p)->error_lineno)
+#else
+#define HTTP_PARSER_ERRNO_LINE(p)       0
+#endif
+
+
+struct http_parser {
+  /** PRIVATE **/
+  unsigned char type : 2;
+  unsigned char flags : 6; /* F_* values from 'flags' enum; semi-public */
+  unsigned char state;
+  unsigned char header_state;
+  unsigned char index;
+
+  uint32_t nread;
+  int64_t content_length;
+
+  /** READ-ONLY **/
+  unsigned short http_major;
+  unsigned short http_minor;
+  unsigned short status_code; /* responses only */
+  unsigned char method;    /* requests only */
+  unsigned char http_errno : 7;
+
+  /* 1 = Upgrade header was present and the parser has exited because of that.
+   * 0 = No upgrade header present.
+   * Should be checked when http_parser_execute() returns in addition to
+   * error checking.
+   */
+  unsigned char upgrade : 1;
+
+#if HTTP_PARSER_DEBUG
+  uint32_t error_lineno;
+#endif
+
+  /** PUBLIC **/
+  void *data; /* A pointer to get hook to the "connection" or "socket" object */
+};
+
+
+struct http_parser_settings {
+  http_cb      on_message_begin;
+  http_data_cb on_url;
+  http_data_cb on_header_field;
+  http_data_cb on_header_value;
+  http_cb      on_headers_complete;
+  http_data_cb on_body;
+  http_cb      on_message_complete;
+};
+
+
+void http_parser_init(http_parser *parser, enum http_parser_type type);
+
+
+size_t http_parser_execute(http_parser *parser,
+                           const http_parser_settings *settings,
+                           const char *data,
+                           size_t len);
+
+
+/* If http_should_keep_alive() in the on_headers_complete or
+ * on_message_complete callback returns true, then this will be should be
+ * the last message on the connection.
+ * If you are the server, respond with the "Connection: close" header.
+ * If you are the client, close the connection.
+ */
+int http_should_keep_alive(http_parser *parser);
+
+/* Returns a string version of the HTTP method. */
+const char *http_method_str(enum http_method m);
+
+/* Return a string name of the given error */
+const char *http_errno_name(enum http_errno err);
+
+/* Return a string description of the given error */
+const char *http_errno_description(enum http_errno err);
+
+#ifdef __cplusplus
+}
+#endif
+#endif