https://bz.apache.org/bugzilla/show_bug.cgi?id=63891
Bug ID: 63891
Summary: Balancer failover fails for POST with small request
Body and CL set
Product: Apache httpd-2
Version: 2.4.41
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P2
Component: mod_proxy_http
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Since r1860166 in 2.4.41 the order of request body prefetch and backend connect
changed. This is due to backporting r1656259 "mod_proxy_http: don't connect or
reuse backend before prefetching request body." or parts of it with the same
commit.
Now when a POST request has a small body that fits into the prefetch buffer and
has CL set plus the request to the first backend in the balancer fails during
the TCP connect to this backend, the failed over request will be send to the
next backend with a CL of 0.
Order of execution:
2.4.39:
In proxy_http_handler():
- ap_proxy_determine_connection()
- ap_proxy_check_connection()
- optionally ap_proxy_connect_backend() which might fail.
- ap_proxy_connection_create_ex()
- ap_proxy_http_request() which does prefetch late!
2.4.41:
In proxy_http_handler():
- ap_proxy_determine_connection()
- early ap_proxy_http_prefetch() which does the prefetch!
- optionally again ap_proxy_determine_connection()
- ap_proxy_check_connection()
- optionally ap_proxy_connect_backend() which might fail.
- ap_proxy_connection_create_ex()
- ap_proxy_http_request()
Regards,
Rainer
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