cnp3-ebook/protocols/http2 — English @ Weblate

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36 ../../protocols/http2.rst:239

	English HTTP/2.0 is a new version of the HTTP protocol that still uses port 80. When a client contacts an HTTP server, it must be able to determine whether it supports HTTP/1.x or HTTP/2.0. If the client sends a binary encoded HTTP/2.0 request to a server that only supports the ASCII encoded HTTP/1.x, it could cause problems on the server and even crash it. To minimize the risk of crashing HTTP/1.x servers, an HTTP/2.0 session starts like an HTTP/1.1 session and the first request contains the `Connection`, `Upgrade` and `HTTP2-Settings` headers. An example of such a request to upgrade the version of HTTP is shown below. 619/10000 · 619
37 ../../protocols/http2.rst:251

	English The `HTTP2-Settings` line contains the HTTP/2.0 settings frame that the client would server over an HTTP/2.0 session encoded in Base64. The server replies with a response that indicates that it has accepted to upgrade the connection to HTTP/2.0. A sample response is shown below. 279/10000 · 279
38 ../../protocols/http2.rst:260

	English Finally, the client and the server need to confirm the utilization of HTTP/2.0. A client confirms this by sending the following Magic string `PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n` or `0x505249202a20485454502f322e300d0a0d0a534d0d0a0d0a` in hex. This string is followed by a SETTINGS frame. The server must send a possibly empty SETTINGS frame. 338/10000 · 338
39 ../../protocols/http2.rst:266

	English Footnotes 9/10000 · 9
40 ../../protocols/http2.rst:267

	English See https://en.wikipedia.org/wiki/HTTP_pipelining for additional information. 77/10000 · 77
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