Hello,
I have a problem with mod_deflate. If deflate is enabled, 304 responses from
PHP are returned with some binary body data, which is in violation of
RFC2616 (304 response must have no body), and breaks pipelining/keep-alive.
Here is a simple test:
http://pp.siedziba.pl/tmp/ifmodifiedtest.php
Reload the page in a browser with some sniffer running, or just telnet to
the server and send Accept-Encoding and If-Modified headers like this:
$ telnet pp.siedziba.pl 80
Trying 213.25.55.158.80...
Connected to pp158.warszawa.sdi.tpnet.pl.
Escape character is '^]'.
GET /tmp/ifmodifiedtest.php HTTP/1.1
Host: pp.siedziba.pl
Accept-Encoding: gzip,deflate
If-Modified-Since: Sat, 14 Apr 2001 20:00:36 GMT
Binary data after the response may not be visible in a shell, so it may be a
good idea to redirect the output to a file.
I tested it with Apache 2.0.(53|54) and PHP 5.0.(3|4) (mod_php, compiled as
a handler). More details about my system:
http://pp.siedziba.pl/tmp/phpinfo.php
To work-around this problem, I added a simple check to mod_deflate.c:
(...)
return ap_pass_brigade(f->next, bb);
}
/* don't work on responses which must have no content */
if (r->status == HTTP_NOT_MODIFIED || r->status == HTTP_NO_CONTENT)
{
ap_remove_output_filter(f);
return ap_pass_brigade(f->next, bb);
}
/* some browsers might have problems, so set no-gzip
* (with browsermatch) for them
*/
if (apr_table_get(r->subprocess_env, "no-gzip")) {
(...)
It seems to work, as seen here:
http://biuro.siedziba.pl/tmp/ifmodifiedtest.php
(same test script, different server)
I don't know if this is a proper solution though.
Is it a known issue? Anyone else experiencing this problem?
Regards,
--
Piotr Pawłow
mailto:pp@xxxxxxxxxxx
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