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https://issues.apache.org/jira/browse/HTTPCLIENT-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17884346#comment-17884346
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Arturo Bernal commented on HTTPCLIENT-2344:
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I still don’t see any issue here. The HttpClient is behaving correctly and
following RFC-2817 as intended. While servers and proxies are not obligated to
accept upgrade requests per RFC-9110, rejecting these requests doesn’t mean the
client is at fault. This is more of a compatibility concern rather than a bug
in the client itself.
> 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
> Fix For: 5.4.1
>
>
> 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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