https://bz.apache.org/bugzilla/show_bug.cgi?id=65666
Bug ID: 65666
Summary: 2.4.47 breaks ability to unset Expect header for proxy
compatibility, yielding 417 errors
Product: Apache httpd-2
Version: 2.4.47
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: P2
Component: mod_proxy
Assignee: bugs@httpd.apache.org
Reporter: kan...@luxsci.com
Target Milestone: ---
Using mod_proxy and mod_headers. Compiling apache on Oracle Linux 8 and CentOs
7.
Using v2.4.46 and prior versions, we have been able to use
RequestHeader unset Expect early
to remove the Expect header for requests that will use ProxyPass. This served
to remove errors (417 errors) when "Expect: 100-continue" was sent for a
proxied connection. This has worked for years until we updated to 2.4.50 this
week. We immediately started getting 417 errors on these connections again.
Rolling back to 2.4.46 with no other changes solved the problem on all upgraded
servers.
It appears that 2.4.47 has a patch for a mod_proxy/Expect issue in the Change
list:
"*) mod_proxy_http: Fix 100-continue deadlock for spooled request bodies,
leading to Request Timeout (408). PR 63855. [Yann Ylavic]"
I see no other related changes in 47->50... so perhaps this patch broke
something? Troubleshoot further (besides rollback), we have tried (all with no
success):
1/ Adding the "RequestHeader unset Expect early" globally instead of in a Vhost
2/ Adding "Proxy100Continue Off"
We have also:
1/ Verified that "RequestHeader unset" is working by sending other headers
through, and verifying that the back-end scripts do not see them. (We have not
verified that it is merely "early" that is failing).
2/ Verified that connections with an Expect header to a non-proxied page work
fine... it is only pages served with ProxyPass
We have not yet found a workaround that permits: ProxyPass + Clients sending an
Expect header + Apache 2.4.50+ to function properly. We have also not yet
found any discussion of this on Google.
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