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https://issues.apache.org/jira/browse/HTTPCORE-669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911048#comment-17911048
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Oleg Kalnichevski commented on HTTPCORE-669:
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[~cooltomatos] It should certainly be possible. Take a look at
`ServerH2PrefaceHandler`. At present it fails with ProtocolNegotiationException
if it does not receive a valid H2 preface. What you could do is to create a
custom protocol negotiator falls back onto HTTP/1.1 protocol instead of failing
the protocol negotiation.
https://github.com/apache/httpcomponents-core/blob/master/httpcore5-h2/src/main/java/org/apache/hc/core5/http2/impl/nio/ServerH2PrefaceHandler.java#L90
Oleg
> I found use H2C ,the capture packet doesn't contain Upgrade header
> ------------------------------------------------------------------
>
> Key: HTTPCORE-669
> URL: https://issues.apache.org/jira/browse/HTTPCORE-669
> Project: HttpComponents HttpCore
> Issue Type: Wish
> Components: HttpCore
> Affects Versions: 5.0.3
> Reporter: zd
> Priority: Minor
> Fix For: Future
>
> Attachments: image-2021-02-25-14-25-40-888.png,
> image-2021-02-25-14-27-06-073.png
>
>
> My server is support H2C ,and I use JDK 11 httpclient ,this capture packet
> is
> !image-2021-02-25-14-25-40-888.png!
> when I use HttpClient Core , the capture packet is
> !image-2021-02-25-14-27-06-073.png!
> it likes use H2C directly.
> I found the RFC7540 says like JDK11 httpClient is correctly
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