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https://issues.apache.org/jira/browse/HTTPCLIENT-2344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17913871#comment-17913871
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Stephane Bailliez commented on HTTPCLIENT-2344:
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[~olegk] - This has been reported already.

> 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 upgradeĀ  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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