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