mirror of https://github.com/moparisthebest/curl
HTTP2: mention the tool's limited support
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@ -96,18 +96,31 @@ curl tool
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curl offers the `--http2` command line option to enable use of HTTP/2.
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curl offers the `--http2` command line option to enable use of HTTP/2.
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curl offers the `--http2-prior-knowledge` command line option to enable use of
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curl offers the `--http2-prior-knowledge` command line option to enable use of
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HTTP/2 without HTTP/1.1 Upgrade.
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HTTP/2 without HTTP/1.1 Upgrade.
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Since 7.47.0, the curl tool enables HTTP/2 by default for HTTPS connections.
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Since 7.47.0, the curl tool enables HTTP/2 by default for HTTPS connections.
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curl tool limitations
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---------------------
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The command line tool won't do any HTTP/2 multiplexing even though libcurl
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supports it, simply because the curl tool is not written to take advantage of
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the libcurl API that's necessary for this (the multi interface). We have an
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outstanding TODO item for this and **you** can help us make it happen.
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The command line tool also doesn't support HTTP/2 server push for the same
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reason it doesn't do multiplexing: it needs to use the multi interface for
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that so that multiplexing is supported.
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HTTP Alternative Services
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HTTP Alternative Services
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-------------------------
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-------------------------
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Alt-Svc is a suggested extension with a corresponding frame (ALTSVC) in HTTP/2
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Alt-Svc is an extension with a corresponding frame (ALTSVC) in HTTP/2 that
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that tells the client about an alternative "route" to the same content for the
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tells the client about an alternative "route" to the same content for the same
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same origin server that you get the response from. A browser or long-living
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origin server that you get the response from. A browser or long-living client
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client can use that hint to create a new connection asynchronously. For
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can use that hint to create a new connection asynchronously. For libcurl, we
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libcurl, we may introduce a way to bring such clues to the applicaton and/or
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may introduce a way to bring such clues to the applicaton and/or let a
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let a subsequent request use the alternate route
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subsequent request use the alternate route automatically.
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automatically. [Spec](https://tools.ietf.org/html/draft-ietf-httpbis-alt-svc-14)
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[Detailed in RFC 7838](https://tools.ietf.org/html/rfc7838)
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