Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_HTTP_VERSION.3 @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH CURLOPT_HTTP_VERSION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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24 .SH NAME
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25 CURLOPT_HTTP_VERSION \- specify HTTP protocol version to use
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26 .SH SYNOPSIS
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27 #include <curl/curl.h>
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28
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29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);
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30 .SH DESCRIPTION
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31 Pass \fIversion\fP a long, set to one of the values described below. They ask
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32 libcurl to use the specific HTTP versions.
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33
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34 Note that the HTTP version is just a request. libcurl will still prioritize to
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35 re-use an existing connection so it might then re-use a connection using a
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36 HTTP version you haven't asked for.
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37
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38 .IP CURL_HTTP_VERSION_NONE
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39 We don't care about what version the library uses. libcurl will use whatever
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40 it thinks fit.
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41 .IP CURL_HTTP_VERSION_1_0
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42 Enforce HTTP 1.0 requests.
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43 .IP CURL_HTTP_VERSION_1_1
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44 Enforce HTTP 1.1 requests.
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45 .IP CURL_HTTP_VERSION_2_0
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46 Attempt HTTP 2 requests. libcurl will fall back to HTTP 1.1 if HTTP 2 can't be
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47 negotiated with the server. (Added in 7.33.0)
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48
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49 The alias \fICURL_HTTP_VERSION_2\fP was added in 7.43.0 to better reflect the
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50 actual protocol name.
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51 .IP CURL_HTTP_VERSION_2TLS
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52 Attempt HTTP 2 over TLS (HTTPS) only. libcurl will fall back to HTTP 1.1 if
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53 HTTP 2 can't be negotiated with the HTTPS server. For clear text HTTP servers,
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54 libcurl will use 1.1. (Added in 7.47.0)
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55 .IP CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE
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56 Issue non-TLS HTTP requests using HTTP/2 without HTTP/1.1 Upgrade. It requires
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57 prior knowledge that the server supports HTTP/2 straight away. HTTPS requests
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58 will still do HTTP/2 the standard way with negotiated protocol version in the
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59 TLS handshake. (Added in 7.49.0)
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60 .IP CURL_HTTP_VERSION_3
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61 (Added in 7.66.0) Setting this value will make libcurl attempt to use HTTP/3
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62 directly to server given in the URL. Note that this cannot gracefully
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63 downgrade to earlier HTTP version if the server doesn't support HTTP/3.
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64
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65 For more reliably upgrading to HTTP/3, set the prefered version to something
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66 lower and let the server announce its HTTP/3 support via Alt-Svc:. See
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67 \fICURLOPT_ALTSVC(3)\fP.
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68 .SH DEFAULT
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69 Since curl 7.62.0: CURL_HTTP_VERSION_2TLS
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70
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71 Before that: CURL_HTTP_VERSION_1_1
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72 .SH PROTOCOLS
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73 HTTP
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74 .SH EXAMPLE
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75 .nf
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76 CURL *curl = curl_easy_init();
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77 if(curl) {
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78 CURLcode ret;
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79 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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80 curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2TLS);
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81 ret = curl_easy_perform(curl);
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82 if(ret == CURLE_HTTP_RETURNED_ERROR) {
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83 /* an HTTP response error problem */
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84 }
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85 }
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86 .fi
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87 .SH AVAILABILITY
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88 Along with HTTP
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89 .SH RETURN VALUE
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90 Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
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91 .SH "SEE ALSO"
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92 .BR CURLOPT_SSLVERSION "(3), " CURLOPT_HTTP200ALIASES "(3), "
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93 .BR CURLOPT_HTTP09_ALLOWED "(3), " CURLOPT_ALTSVC "(3) "