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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 .\" **************************************************************************
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8 .\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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10 .\" * This software is licensed as described in the file COPYING, which
11 .\" * you should have received as part of this distribution. The terms
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22 .\"
23 .TH CURLOPT_HTTP_VERSION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_HTTP_VERSION \- specify HTTP protocol version to use
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);
30 .SH DESCRIPTION
31 Pass \fIversion\fP a long, set to one of the values described below. They ask
32 libcurl to use the specific HTTP versions.
33
34 Note that the HTTP version is just a request. libcurl will still prioritize to
35 re-use an existing connection so it might then re-use a connection using a
36 HTTP version you haven't asked for.
37
38 .IP CURL_HTTP_VERSION_NONE
39 We don't care about what version the library uses. libcurl will use whatever
40 it thinks fit.
41 .IP CURL_HTTP_VERSION_1_0
42 Enforce HTTP 1.0 requests.
43 .IP CURL_HTTP_VERSION_1_1
44 Enforce HTTP 1.1 requests.
45 .IP CURL_HTTP_VERSION_2_0
46 Attempt HTTP 2 requests. libcurl will fall back to HTTP 1.1 if HTTP 2 can't be
47 negotiated with the server. (Added in 7.33.0)
48
49 The alias \fICURL_HTTP_VERSION_2\fP was added in 7.43.0 to better reflect the
50 actual protocol name.
51 .IP CURL_HTTP_VERSION_2TLS
52 Attempt HTTP 2 over TLS (HTTPS) only. libcurl will fall back to HTTP 1.1 if
53 HTTP 2 can't be negotiated with the HTTPS server. For clear text HTTP servers,
54 libcurl will use 1.1. (Added in 7.47.0)
55 .IP CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
56 Issue non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade. It requires
57 prior knowledge that the server supports HTTP/2 straight away. HTTPS requests
58 will still do HTTP/2 the standard way with negotiated protocol version in the
59 TLS handshake. (Added in 7.49.0)
60 .IP CURL_HTTP_VERSION_3
61 (Added in 7.66.0) Setting this value will make libcurl attempt to use HTTP/3
62 directly to server given in the URL. Note that this cannot gracefully
63 downgrade to earlier HTTP version if the server doesn't support HTTP/3.
64
65 For more reliably upgrading to HTTP/3, set the prefered version to something
66 lower and let the server announce its HTTP/3 support via Alt-Svc:. See
67 \fICURLOPT_ALTSVC(3)\fP.
68 .SH DEFAULT
69 Since curl 7.62.0: CURL_HTTP_VERSION_2TLS
70
71 Before that: CURL_HTTP_VERSION_1_1
72 .SH PROTOCOLS
73 HTTP
74 .SH EXAMPLE
75 .nf
76 CURL *curl = curl_easy_init();
77 if(curl) {
78 CURLcode ret;
79 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
80 curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2TLS);
81 ret = curl_easy_perform(curl);
82 if(ret == CURLE_HTTP_RETURNED_ERROR) {
83 /* an HTTP response error problem */
84 }
85 }
86 .fi
87 .SH AVAILABILITY
88 Along with HTTP
89 .SH RETURN VALUE
90 Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
91 .SH "SEE ALSO"
92 .BR CURLOPT_SSLVERSION "(3), " CURLOPT_HTTP200ALIASES "(3), "
93 .BR CURLOPT_HTTP09_ALLOWED "(3), " CURLOPT_ALTSVC "(3) "