ajp through ProxyPass is sending HTTP HEAD requests as HTTPGET to servlets. 2007-08-08 - By Rainer Jung
Back
Hi Chad,
yes, it looks like that's a bug in mod_proxy_ajp. You should log a bug
in bugzilla for httpd. I checked the code for Apache httpd 2.2.4 and
also shortly for 2.2.x head and trunk.
The situation is as follows (you might include this in the bug description):
Apache httpd decodes HTTP methods as method_number. HTTP HEAD and GET
get the same method_number. To make HEAD distinguishable form GET,
adiitionally header_only gets set for a HEAD request.
mod_proxy_ajp only decodes the method_number and doesn't check the
header_only flag. So every HEAD request gets forwarded as a GET request.
In order to fix the forwarding, one has to improve
ajp_marshal_into_msgb() in ajp_header.c and also ap_proxy_ajp_request(9
in mod_proxy_ajp.c. A patch against 2.2.4 could be close to the
following (I didn't test, I didn't even compile it):
Index: mod_proxy_ajp.c
===================================================================
--- mod_proxy_ajp.c (revision 563796)
+++ mod_proxy_ajp.c (working copy)
@@ -313,6 +313,16 @@
break;
case CMD_AJP13_SEND_BODY_CHUNK:
/* AJP13_SEND_BODY_CHUNK: piece of data */
+ if (r->header_only) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
+ "proxy: header only");
+ isok = 0;
+ /* Pass EOS bucket down the filter chain. */
+ e = apr_bucket_eos_create(r->connection->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(output_brigade, e);
+ apr_brigade_cleanup(output_brigade);
+ break;
+ }
status = ajp_parse_data(r, conn->data, &size, &buff);
if (status == APR_SUCCESS) {
if (size == 0) {
Index: ajp_header.c
===================================================================
--- ajp_header.c (revision 563796)
+++ ajp_header.c (working copy)
@@ -224,6 +224,9 @@
r->method);
return AJP_EBAD_METHOD;
}
+ if ((method == SC_M_GET) && r->header_only) {
+ method = SC_M_HEAD;
+ }
is_ssl = (apr_byte_t) ap_proxy_conn_is_https(r->connection);
Regards,
Rainer
Chad Scholes wrote:
> I am using Apache 2.2.3 and Tomcat 5.0. I use ProxyPass to ajp to
> send Servlet requests from Apache to Tomcat and for some reason all
> HEAD requests are being sent to my servlets as GET requests. I
> probably don't have something setup correctly but I don't know what
> would affect the HEAD request.
>
> My Apache configuration for ProxyPass is set like:
>
> Alias /qfsearch "/var/lib/qfsearch/docs" <Location "/qfsearch"> Allow
> from all </Location> ProxyPass /qfsearch
> ajp://localhost:9009/qfsearch
>
>
> mod_proxy and mod_rewrite are setup as:
>
> <IfModule mod_proxy.c> <Proxy *> Order deny,allow Deny from all
> </Proxy> ProxyRequests Off </IfModule>
>
> <IfModule mod_rewrite.c> RewriteEngine On RewriteLog
> /var/log/apache2/rewrite_log RewriteLogLevel 1 </IfModule>
>
>
> In the apache access log the request is getting to apache as a "HEAD"
> request: 137.65.79.137 - - [06/Aug/2007:14:33:45 -0600] "HEAD
> /qfsearch/ClusterServlet?server=qfsearch3.provo.novell.com&type=index&putname
=duh&putsubname=qfind.idx&idxdatetime=1186176509000&idxlocation=%2Fvar%2Flib
%2Fqfsearch%2FSites%2Fdefault%2Findexes%2Fduh%2F2007-08-03%3B+15.28.29&put=qfind
.idx&filesize=11709498&datetime=1186176509000&do=canput
> HTTP/1.1" 503 - "-" "Java/1.5.0"
>
>
> However, I have a servlet that overrides the service function and in
> that call request.getMethod() and it is now returning "GET" not
> "HEAD".
>
> If I call Tomcat directly then everything works fine
> (request.getMethod() returns "HEAD"). This particular section of code
> has been working for years with the JKMount command but now that we
> have changed to the ProxyPass it is not working. If you have any
> ideas what could be wrong I would appreciate the help!
>
> Thanks you!! Chad
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ------
To start a new topic, e-mail: users@(protected)
To unsubscribe, e-mail: users-unsubscribe@(protected)
For additional commands, e-mail: users-help@(protected)
|
|
