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https://issues.apache.org/jira/browse/HTTPCLIENT-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913812#comment-17913812
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Oleg Kalnichevski commented on HTTPCLIENT-2344:
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[~sbailliez] The endpoint is absolutely correct in rejecting the request as
invalid as it lacks 'Connection: upgrade' header which is mandatory
See RFC 9110 section 7.8
Oleg
> HTTP/1.1 TLS Upgrade (RFC-2817) should not be default
> -----------------------------------------------------
>
> Key: HTTPCLIENT-2344
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2344
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 5.4
> Reporter: Ben Plotnick
> Priority: Minor
>
> Version 5.4 added RFC-2817 support, which by default tries to upgrade since
> protocolUpgradeEnabled is default enabled.
> Although the strict reading of the spec would indicate that a server should
> ignore upgrade requests that it cannot service, conservative proxies might
> reject these requests entirely. This is the case in Envoy today
> I don't see a big advantage to enabling this by default and it is causing
> real issues now.
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