code cleanup, minor bug fixes, allow lookup up trailing values with key of NULL

git-svn-id: https://gnunet.org/svn/libmicrohttpd@22733 140774ce-b5e7-0310-ab8b-a85725594a96

Author: grothoff

ChangeLog

@@ -1,3 +1,8 @@
+Tue Jul 17 23:50:43 CEST 2012
+	Stylistic code clean up.  Allowing lookup up of trailing values
+	without keys using "MHD_lookup_connection_value" with a key of NULL
+	(thus achieving consistency with the existing iterator API). -CG
+
 Tue Jul 17 22:37:05 CEST 2012
 	Adding experimental (!) code for MHD operation without listen socket. -CG
 

doc/microhttpd.texi

@@ -1270,12 +1270,16 @@ and @code{MHD_YES} on success.
 
 
 @deftypefun {const char *} MHD_lookup_connection_value (struct MHD_Connection *connection, enum MHD_ValueKind kind, const char *key)
-Get a particular header value.  If multiple values match the @var{kind},
-return one of them (the ``first'', whatever that means).  @var{key} must
-reference a zero-terminated @ascii{}-coded string representing the
-header to look for: it is compared against the headers using
-@cfunction{strcasecmp}, so case is ignored.  Return @mynull{} if no such
-item was found.
+Get a particular header value.  If multiple values match the
+@var{kind}, return one of them (the ``first'', whatever that means).
+@var{key} must reference a zero-terminated @ascii{}-coded string
+representing the header to look for: it is compared against the
+headers using @cfunction{strcasecmp}, so case is ignored.  A value of
+NULL for @var{key} can be used to lookup 'trailing' values without a
+key, for example if a URI is of the form
+``http://example.com/?trailer'', a @var{key} of NULL can be used to
+access ``tailer" The function returns @mynull{} if no matching item
+was found.
 @end deftypefun