Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_SSLVERSION.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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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 - 2015, 2018, 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_SSLVERSION 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_SSLVERSION \- set preferred TLS/SSL version
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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_SSLVERSION, long version);
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30 .SH DESCRIPTION
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31 Pass a long as parameter to control which version range of SSL/TLS versions to
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32 use.
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33
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34 The SSL and TLS versions have typically developed from the most insecure
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35 version to be more and more secure in this order through history: SSL v2,
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36 SSLv3, TLS v1.0, TLS v1.1, TLS v1.2 and the most recent TLS v1.3.
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37
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38 Use one of the available defines for this purpose. The available options are:
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39 .RS
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40 .IP CURL_SSLVERSION_DEFAULT
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41 The default acceptable version range. The minimum acceptable version is by
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42 default TLS v1.0 since 7.39.0 (unless the TLS library has a stricter rule).
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43 .IP CURL_SSLVERSION_TLSv1
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44 TLS v1.0 or later
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45 .IP CURL_SSLVERSION_SSLv2
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46 SSL v2 (but not SSLv3)
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47 .IP CURL_SSLVERSION_SSLv3
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48 SSL v3 (but not SSLv2)
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49 .IP CURL_SSLVERSION_TLSv1_0
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50 TLS v1.0 or later (Added in 7.34.0)
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51 .IP CURL_SSLVERSION_TLSv1_1
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52 TLS v1.1 or later (Added in 7.34.0)
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53 .IP CURL_SSLVERSION_TLSv1_2
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54 TLS v1.2 or later (Added in 7.34.0)
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55 .IP CURL_SSLVERSION_TLSv1_3
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56 TLS v1.3 or later (Added in 7.52.0)
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57 .RE
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58
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59 The maximum TLS version can be set by using \fIone\fP of the
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60 CURL_SSLVERSION_MAX_ macros below. It is also possible to OR \fIone\fP of the
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61 CURL_SSLVERSION_ macros with \fIone\fP of the CURL_SSLVERSION_MAX_ macros.
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62 The MAX macros are not supported for WolfSSL.
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63 .RS
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64 .IP CURL_SSLVERSION_MAX_DEFAULT
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65 The flag defines the maximum supported TLS version by libcurl, or the default
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66 value from the SSL library is used. libcurl will use a sensible default
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67 maximum, which was TLS v1.2 up to before 7.61.0 and is TLS v1.3 since then -
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68 assuming the TLS library support it. (Added in 7.54.0)
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69 .IP CURL_SSLVERSION_MAX_TLSv1_0
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70 The flag defines maximum supported TLS version as TLS v1.0.
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71 (Added in 7.54.0)
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72 .IP CURL_SSLVERSION_MAX_TLSv1_1
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73 The flag defines maximum supported TLS version as TLS v1.1.
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74 (Added in 7.54.0)
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75 .IP CURL_SSLVERSION_MAX_TLSv1_2
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76 The flag defines maximum supported TLS version as TLS v1.2.
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77 (Added in 7.54.0)
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78 .IP CURL_SSLVERSION_MAX_TLSv1_3
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79 The flag defines maximum supported TLS version as TLS v1.3.
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80 (Added in 7.54.0)
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81 .RE
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82
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83 In versions of curl prior to 7.54 the CURL_SSLVERSION_TLS options were
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84 documented to allow \fIonly\fP the specified TLS version, but behavior was
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85 inconsistent depending on the TLS library.
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86
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87 .SH DEFAULT
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88 CURL_SSLVERSION_DEFAULT
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89 .SH PROTOCOLS
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90 All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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91 .SH EXAMPLE
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92 .nf
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93 CURL *curl = curl_easy_init();
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94 if(curl) {
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95 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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96
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97 /* ask libcurl to use TLS version 1.0 or later */
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98 curl_easy_setopt(curl, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
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99
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100 /* Perform the request */
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101 curl_easy_perform(curl);
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102 }
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103 .fi
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104 .SH AVAILABILITY
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105 SSLv2 is disabled by default since 7.18.1. Other SSL versions availability may
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106 vary depending on which backend libcurl has been built to use.
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107
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108 SSLv3 is disabled by default since 7.39.0.
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109 .SH RETURN VALUE
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110 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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111 .SH "SEE ALSO"
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112 .BR CURLOPT_USE_SSL "(3), " CURLOPT_HTTP_VERSION "(3), "
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113 .BR CURLOPT_PROXY_SSLVERSION "(3), " CURLOPT_IPRESOLVE "(3) "