https://bz.apache.org/bugzilla/show_bug.cgi?id=64946
Bug ID: 64946
Summary: Websocket tunnel is created and stay opened even if
the handshake failed
Product: Apache httpd-2
Version: 2.4.46
Hardware: Other
OS: All
Status: NEW
Severity: blocker
Priority: P2
Component: mod_proxy_wstunnel
Assignee: bugs@httpd.apache.org
Reporter: valentin.oza...@gmail.com
Target Milestone: ---
Hi,
We are facing a critical issue with mod_proxy_ws_tunnel : Websocket tunnel is
created and stay opened even if the handshake failed
Here is the observed behavior:
Assumptions:
- Let’s assume httpd is configured as reverse proxy with 2 backends :
backend_websocket_1 and backend_2
- The client is a browser that works with a reusable tcp/http connection pool.
Typical issue that occurred
- The Browser try to establish a websocket connection to /backend1
- backend_websocket_1 answers 500 instead 101 during websocket handshake (due
to temporary error)
- The browser received the 500 and considers the websocket connection as failed
- The browser reuse the same tcp connection to send others http requests to
backend_2
- The new http requests (to backend_2 for example) are not catched properly by
httpd and are directly forwarded to backend_websocket_1 (it seems they are
forwaded directly in the previously opened tunnel).
Additional notes:
We succeeded to reproduce this behavior on many httpd version 2.4.46 included.
We also test the same scenario with an other reverse proxy (haproxy) and
everything works fine
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