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From Eric Covener <>
Subject Re: [users@httpd] RE: Web sockets & proxypass - No protocol handler was valid for the URL
Date Thu, 07 Sep 2017 16:04:09 GMT
On Thu, Sep 7, 2017 at 10:19 AM, Damien Clark <> wrote:
>> On 7 Sep 2017, at 11:53 pm, Eric Covener <> wrote:
>>> I am wondering whether the use of a rewriterule with the “P” flag is the
reason the upgrade header hasn’t been included.  I wonder this because it is pretty widely
reported to work fine when using ProxyPass to ws uri.

Since you have 2.4.27, can you try (untested -- please log
%{no-proxy}e to make sure nothing subtle is wrong)

# Don't allow ProxyPass to find these
SetEnvIf Upgrade (?i)websocket no-proxy=1

RewriteRule ... [P,E=no-proxy:1] is too late unfortunately.

no-proxy should not block RewriteBased [P] flag, only the ProxyPass.

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