Can you please try if the following patch fixes your issue?
Index: mod_proxy_ajp.c
===================================================================
--- mod_proxy_ajp.c (revision 1150558)
+++ mod_proxy_ajp.c (working copy)
@@ -506,16 +506,18 @@
if (bb_len != -1)
conn->worker->s->read += bb_len;
}
- if (ap_pass_brigade(r->output_filters,
- output_brigade) != APR_SUCCESS) {
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "proxy: error processing body.%s",
- r->connection->aborted ?
- " Client aborted connection." : "");
- output_failed = 1;
+ if (headers_sent) {
+ if (ap_pass_brigade(r->output_filters,
+ output_brigade) !=
APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "proxy: error processing
body.%s",
+ r->connection->aborted ?
+ " Client aborted connection." :
"");
+ output_failed = 1;
+ }
+ data_sent = 1;
+ apr_brigade_cleanup(output_brigade);
}
- data_sent = 1;
- apr_brigade_cleanup(output_brigade);
}
}
else {
Currently the code sends an empty brigade in your case which also triggers the
sending of headers by httpd.
Regards
Rüdiger
> -----Original Message-----
> From: Jim Riggs
> Sent: Dienstag, 2. August 2011 18:03
> To: [email protected]
> Subject: mod_proxy_ajp: ignoring flush before headers (again)
>
> For some (old 2007) context, see:
>
> http://markmail.org/message/btwcnbl2i7ftwj4n
>
> https://community.jivesoftware.com/message/201787
>
>
> I am proxying an app via AJP to Tomcat 6/7. In certain
> circumstances, it appears that the app (or possibly Tomcat)
> is erroneously sending a flush before the headers have been
> sent. In r579999, Jim added an exception to handle this
> situation with the intention of ignoring the flush. I'm not
> sure it's working quite right, though, as the brigade is
> still getting passed through the filter chain. So,
> ap_headers_output_filter() is getting called too soon, I
> think. (I am no expert in the httpd code, so I'm not sure
> this is really the problem.)
>
> Can any of you who ARE experts in the code tell me what you
> think of the issue and how we can fix it? I'm thinking that
> if we are ignoring a flush at mod_proxy_ajp.c:448 (in 2.2.x),
> we should not be calling ap_pass_brigade() at line 472, but I
> don't know if there are any ramifications of that.
>
> The symptom is that when this issue happens, the user gets
> prompted to save a file (Content-Type returned by httpd is
> 'text/plain' even though Tomcat is returning
> 'text/html;charset=utf-8'). Below is some debug output
> showing correct and incorrect behavior:
>
> Correct:
>
> [Tue Aug 02 09:34:50 2011] [debug] mod_proxy_ajp.c(266):
> proxy: APR_BUCKET_IS_EOS
> [Tue Aug 02 09:34:50 2011] [debug] mod_proxy_ajp.c(271):
> proxy: data to read (max 8186 at 4)
> [Tue Aug 02 09:34:50 2011] [debug] mod_proxy_ajp.c(286):
> proxy: got 0 bytes of data
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(687):
> ajp_read_header: ajp_ilink_received 04
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(697):
> ajp_parse_type: got 04
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(516):
> ajp_unmarshal_response: status = 200
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(537):
> ajp_unmarshal_response: Number of headers is = 5
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[0] [Pragma] = [No-cache]
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[1] [Cache-Control] = [no-cache]
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[2] [Expires] = [Wed, 31 Dec
> 1969 18:00:00 CST]
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[4] [Content-Type] =
> [text/html;charset=utf-8]
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(609):
> ajp_unmarshal_response: ap_set_content_type done
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(687):
> ajp_read_header: ajp_ilink_received 03
> [Tue Aug 02 09:34:50 2011] [debug] ajp_header.c(697):
> ajp_parse_type: got 03
> [Tue Aug 02 09:34:50 2011] [debug] mod_headers.c(756):
> headers: ap_headers_output_filter()
>
>
> Incorrect (notice how ap_headers_output_filter() is called
> before the headers are received):
>
> [Tue Aug 02 09:32:18 2011] [debug] mod_proxy_ajp.c(266):
> proxy: APR_BUCKET_IS_EOS
> [Tue Aug 02 09:32:18 2011] [debug] mod_proxy_ajp.c(271):
> proxy: data to read (max 8186 at 4)
> [Tue Aug 02 09:32:18 2011] [debug] mod_proxy_ajp.c(286):
> proxy: got 0 bytes of data
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(687):
> ajp_read_header: ajp_ilink_received 03
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(697):
> ajp_parse_type: got 03
> [Tue Aug 02 09:32:18 2011] [debug] mod_proxy_ajp.c(452):
> Ignoring flush message received before headers
> [Tue Aug 02 09:32:18 2011] [debug] mod_headers.c(756):
> headers: ap_headers_output_filter()
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(687):
> ajp_read_header: ajp_ilink_received 03
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(697):
> ajp_parse_type: got 03
> [Tue Aug 02 09:32:18 2011] [debug] mod_proxy_ajp.c(452):
> Ignoring flush message received before headers
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(687):
> ajp_read_header: ajp_ilink_received 04
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(697):
> ajp_parse_type: got 04
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(516):
> ajp_unmarshal_response: status = 200
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(537):
> ajp_unmarshal_response: Number of headers is = 5
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[0] [Pragma] = [No-cache]
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[1] [Cache-Control] = [no-cache]
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[2] [Expires] = [Wed, 31 Dec
> 1969 18:00:00 CST]
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[3] [Set-Cookie] =
> [JSESSIONID=39968855F543CA08A440E6136EA6FC28.app1;
> Path=/tomcat-manager; Secure; HttpOnly]
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(599):
> ajp_unmarshal_response: Header[4] [Content-Type] =
> [text/html;charset=utf-8]
> [Tue Aug 02 09:32:18 2011] [debug] ajp_header.c(609):
> ajp_unmarshal_response: ap_set_content_type done
>
>
