[core] permit env w/ blank value (fix regression)

(thx Lars Bingchong)

empty env var must be set to blank string and not left unset
(regression in lighttpd 1.4.56 - lighttpd 1.4.64)

x-ref:
  https://stackoverflow.com/a/52913064/1338888

1 files changed, 19 insertions, 1 deletions

diff --git a/tests/request.t b/tests/request.t
index 5c27c48b..68829d5b 100755
--- a/tests/request.t
+++ b/tests/request.t
@@ -8,7 +8,7 @@ BEGIN {
 
 use strict;
 use IO::Socket;
-use Test::More tests => 176;
+use Test::More tests => 178;
 use LightyTest;
 
 my $tf = LightyTest->new();
@@ -1399,6 +1399,24 @@ EOF
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.1', 'HTTP-Status' => 200, '+Content-Length' => '' } ];
 ok($tf->handle_http($t) == 0, 'cgi-env: HTTP_HOST');
 
+$t->{REQUEST}  = ( <<EOF
+GET /cgi.pl?env=ABSENT HTTP/1.1
+Host: www.example.org
+Connection: close
+EOF
+ );
+$t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.1', 'HTTP-Status' => 200, 'HTTP-Content' => '[ABSENT not found]' } ];
+ok($tf->handle_http($t) == 0, 'cgi-env: ABSENT');
+
+$t->{REQUEST}  = ( <<EOF
+GET /cgi.pl?env=BLANK_VALUE HTTP/1.1
+Host: www.example.org
+Connection: close
+EOF
+ );
+$t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.1', 'HTTP-Status' => 200, 'HTTP-Content' => '' } ];
+ok($tf->handle_http($t) == 0, 'cgi-env: BLANK_VALUE');
+
 # broken header crash
 $t->{REQUEST}  = ( <<EOF
 GET /cgi.pl?crlfcrash HTTP/1.0