RFC 2616 says "All 1xx (informational), 204 (no content), and 304 (not

modified) responses MUST NOT include a message-body," so
Content-Length: is not needed in these cases (and Apache does indeed
not include it).  This causes PassBody() to call pass_straight() with
a NULL length argument, which waits until the connection is closed by
the server.  PassBody() should not call pass_*() at all for responses
that are known to be bodyless.

Submitted by:	Dagfinn Ilmari Mannsåker <ilmari@ping.uio.no>


git-svn-id: http://www.varnish-cache.org/svn/trunk@1138 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache.h

@@ -371,6 +371,7 @@ void http_Setup(struct http *ht, void *space, unsigned len);
 int http_GetHdr(struct http *hp, const char *hdr, char **ptr);
 int http_GetHdrField(struct http *hp, const char *hdr, const char *field, char **ptr);
 int http_GetStatus(struct http *hp);
+int http_IsBodyless(struct http *hp);
 int http_HdrIs(struct http *hp, const char *hdr, const char *val);
 int http_GetTail(struct http *hp, unsigned len, char **b, char **e);
 int http_Read(struct http *hp, int fd, void *b, unsigned len);

bin/varnishd/cache_http.c

@@ -316,6 +316,21 @@ http_GetStatus(struct http *hp)
 	    NULL /* XXX */, 10));
 }
 
+/*---------------------------------------------------------------------
+ * All 1xx (informational), 204 (no content), and 304 (not modified)
+ * responses MUST NOT include a message-body.
+ */
+
+int
+http_IsBodyless(struct http *hp)
+{
+	int status;
+
+	status = http_GetStatus(hp);
+	return (status >= 100 && status < 200)
+		|| status == 204 || status == 304;
+}
+
 /*--------------------------------------------------------------------
  * Dissect the headers of the HTTP protocol message.
  * Detect conditionals (headers which start with '^[Ii][Ff]-')

bin/varnishd/cache_pass.c

@@ -201,6 +201,8 @@ PassBody(struct sess *sp)
 		cls = pass_straight(sp, vc->fd, vc->http, NULL);
 	else if (http_HdrIs(vc->http, H_Transfer_Encoding, "chunked"))
 		cls = pass_chunked(sp, vc->fd, vc->http);
+	else if (http_IsBodyless(vc->http))
+		cls = 0;
 	else {
 		cls = pass_straight(sp, vc->fd, vc->http, NULL);
 	}