[core] shared code for socket backends

common codebase for socket backends, based off mod_fastcgi with
some features added for mod_proxy

(mostly intended to reduce code duplication and enhance code isolation)

mod_fastcgi and mod_scgi can now use fastcgi.balance and scgi.balance
  for similar behavior as proxy.balance, but the balancing is per-host
  and not per-proc.  proxy.balance is also per-host and not per-proc.

mod_proxy and mod_scgi can now use proxy.map-extensions and
scgi.map-extensions, similar to fastcgi.map-extensions.

mod_fastcgi behavior change (affects only mod_status):
- statistics tags have been renamed from "fastcgi.*" to "gw.*"
  "fastcgi.backend.*"       -> "gw.backend.*"
  "fastcgi.active-requests" -> "gw.active-requests"
  ("fastcgi.requests" remains "fastcgi.requests")
  ("proxy.requests" is new)
  ("scgi.requests" is new)

mod_scgi behavior change (likely minor):
- removed scgi_proclist_sort_down() and scgi_proclist_sort_up().
  procs now chosen based on load as measured by num socket connnections

Note:
modules using gw_backend.[ch] are currently still independent modules.
If it had been written as a single module with fastcgi, scgi, proxy
implementations, then there would have been a chance of breaking some
existing user configurations where module ordering made a difference
for which module handled a given request, though for most people, this
would have made no difference.

Details about mod_fastcgi code transformations:
unsigned int debug -> int debug
fastcgi_env member removed from plugin_config
renamed "fcgi" and "fastcgi" to "gw", and "FCGI" to "GW"
reorganize routines for high-level and lower-level interfaces
some lower-level internal interfaces changed to use host,proc,debug
  args rather than knowing about higher-level (app) hctx and plugin_data
tabs->spaces and reformatting

1 files changed, 2 insertions, 1 deletions

diff --git a/src/response.h b/src/response.h
index d0ddc90b..cd268394 100644
--- a/src/response.h
+++ b/src/response.h
@@ -35,8 +35,9 @@ typedef struct http_response_opts_t {
   unsigned short local_redir;
   unsigned short xsendfile_allow;
   array *xsendfile_docroot;
-  handler_t(*parse)(server *, connection *, struct http_response_opts_t *, buffer *, size_t);
   void *pdata;
+  handler_t(*parse)(server *, connection *, struct http_response_opts_t *, buffer *, size_t);
+  handler_t(*headers)(server *, connection *, struct http_response_opts_t *);
 } http_response_opts;
 
 typedef int (*http_cgi_header_append_cb)(void *vdata, const char *k, size_t klen, const char *v, size_t vlen);