https://bz.apache.org/bugzilla/show_bug.cgi?id=64947
--- Comment #3 from Remy Maucherat <r...@apache.org> ---
(In reply to Peter Major from comment #2)
> Sadly I don't have access to the source code (found it when setting up a
> third party reverse proxy product). The reason why upgradeGroupInfo is null,
> is because AbstractHttp11Protocol#getUpgradeGroupInfo is called with a null
> upgradeProtocol.
> The reason why upgradeProtocol is null is that Request#upgrade populates it
> with response.getHeader("upgrade"), and that is being null. Was that meant
> to be request.getHeader instead?
Ok, so that makes sense, there is supposed to be a header "upgrade" in the
response, it's mandatory in the 101 response [I suppose the client never checks
it and just checks the 101 status]. But nothing checks for that missing header
in Tomcat, and something has to be improved to avoid the NPE in that case.
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