Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/libcurl-env.3 @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 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 .TH libcurl-env 3 "20 January 2018" "libcurl 7.58.0" "libcurl environment variables"
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23 .SH NAME
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24 libcurl-env \- environment variables libcurl understands
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25 .SH DESCRIPTION
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26 libcurl reads and understands a set of environment variables that if set will
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27 control and change behaviors. This is the full list of variables to set and
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28 description of what they do. Also note that curl, the command line tool,
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29 supports a set of additional environment variables independently of this.
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30 .IP "[scheme]_proxy"
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31 When libcurl is given a URL to use in a transfer, it first extracts the
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32 "scheme" part from the URL and checks if there is a given proxy set for that
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33 in its corresponding environment variable. A URL like "http://example.com"
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34 will hence use the "http_proxy" variable, while a URL like "ftp://example.com"
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35 will use the "ftp_proxy" variable.
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36
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37 These proxy variables are also checked for in their uppercase versions, except
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38 the "http_proxy" one which is only used lowercase. Note also that some systems
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39 actually have a case insensitive handling of environment variables and then of
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40 course "HTTP_PROXY" will still work...
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41 .IP ALL_PROXY
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42 This is a setting to set proxy for all URLs, independently of what scheme is
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43 being used. Note that the scheme specific variables will override this one if
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44 set.
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45 .IP CURL_SSL_BACKEND
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46 When libcurl is built to support multiple SSL backends, it will select a
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47 specific backend at first use. If no selection is done by the program using
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48 libcurl, this variable's selection will be used. It should be set to the full
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49 SSL backend name to use (case insensitive).
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50 .IP HOME
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51 When the netrc feature is used (\fICURLOPT_NETRC(3)\fP), this variable is
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52 checked as the primary way to find the "current" home directory in which
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53 the .netrc file is likely to exist.
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54 .IP LOGNAME
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55 User name to use when invoking the ntlm-wb tool, if NTLMUSER wasn't set.
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56 .IP NO_PROXY
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57 This has the same functionality as the \fICURLOPT_NOPROXY(3)\fP option: it
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58 gives libcurl a comma-separated list of host name patterns for which libcurl
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59 should not use a proxy.
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60 .IP NTLMUSER
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61 User name to use when invoking the ntlm-wb tool.
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62 .IP SSLKEYLOGFILE
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63 When set and libcurl runs with a SSL backend that supports this feature,
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64 libcurl will save SSL secrets into the given file name. Using those SSL
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65 secrets, other tools (such as Wireshark) can decrypt the SSL communication and
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66 analyze/view the traffic.
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67 .IP SSL_DIR
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68 When libcurl runs with the NSS backends for TLS features, this variable is
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69 used to find the directory for NSS PKI database instead of the built-in.
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70 .IP USER
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71 User name to use when invoking the ntlm-wb tool, if NTLMUSER and LOGNAME
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72 weren't set.
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73 .SH "Debug Variables"
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74 There's a set of variables only recognized and used if libcurl was built
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75 "debug enabled", which should never be true for a library used in production.
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76 .IP "CURL_GETHOSTNAME"
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77 Debug-only variable.
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78 .IP "CURL_FORCETIME"
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79 Debug-only variable.
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80 .IP "CURL_ENTROPY"
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81 Debug-only variable. Used to set a fixed faked value to use instead of a
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82 proper random number so that functions in libcurl that are otherwise getting
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83 random outputs can be tested for what they generate.
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84 .IP "CURL_TRACE"
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85 Debug-only variable. Used for debugging the lib/ldap implementation.
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86 .IP "CURL_NTLM_WB_FILE"
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87 Debug-only variable. Used to set to a debug-version of the ntlm-wb executable.
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88 .IP "CURL_OPENLDAP_TRACE"
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89 Debug-only variable. Used for debugging the lib/openldap.c implementation.