https://bz.apache.org/bugzilla/show_bug.cgi?id=65286

            Bug ID: 65286
           Summary: Websockets connections fail with Apache as forward
                    proxy
           Product: Apache httpd-2
           Version: 2.4.46
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_proxy
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

When Apache is configured as a forward proxy, Websocket connections fail.

The Websocket echo test https://www.websocket.org/echo.html already fails with
"Connect". The error message is

ERROR: undefined

DISCONNECTED

Other connections work as expected.

This is a minimal proxy configuration which shows the issue:

<IfModule mod_proxy.c>
  ProxyRequests On
  <Proxy *>
    Require ip 192.168.1.0/255.255.255.0 127.0.0.0/255.0.0.0 ::1
  </Proxy>
</IfModule>

This is the list of activated Apache modules:

APACHE_MODULES="actions alias asis auth_basic auth_digest authn_file authz_core
authz_host authz_groupfile authz_user autoindex cgi dir env expires include
log_config mime negotiation rewrite setenvif status ssl userdir proxy
proxy_connect proxy_ftp proxy_http proxy_http2 proxy_wstunnel cache cache_disk
authn_core dbd authn_dbd reqtimeout authn_socache socache_shmcb socache_dbm
wsgi proxy-html proxy_html headers xml2enc dav dav_fs http2 proxy_fcgi"

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