115 lines
4.6 KiB
Markdown
115 lines
4.6 KiB
Markdown
<!-- Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. -->
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<!-- SPDX-License-Identifier: curl -->
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# ENVIRONMENT
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The environment variables can be specified in lower case or upper case. The
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lower case version has precedence. `http_proxy` is an exception as it is only
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available in lower case.
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Using an environment variable to set the proxy has the same effect as using
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the --proxy option.
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## `http_proxy` [protocol://]<host>[:port]
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Sets the proxy server to use for HTTP.
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## `HTTPS_PROXY` [protocol://]<host>[:port]
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Sets the proxy server to use for HTTPS.
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## `[url-protocol]_PROXY` [protocol://]<host>[:port]
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Sets the proxy server to use for [url-protocol], where the protocol is a
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protocol that curl supports and as specified in a URL. FTP, FTPS, POP3, IMAP,
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SMTP, LDAP, etc.
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## `ALL_PROXY` [protocol://]<host>[:port]
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Sets the proxy server to use if no protocol-specific proxy is set.
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## `NO_PROXY` <comma-separated list of hosts/domains>
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list of hostnames that should not go through any proxy. If set to an asterisk
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'*' only, it matches all hosts. Each name in this list is matched as either a
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domain name which contains the hostname, or the hostname itself.
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This environment variable disables use of the proxy even when specified with
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the --proxy option. That is
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NO_PROXY=direct.example.com curl -x http://proxy.example.com
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http://direct.example.com
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accesses the target URL directly, and
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NO_PROXY=direct.example.com curl -x http://proxy.example.com
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http://somewhere.example.com
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accesses the target URL through the proxy.
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The list of hostnames can also be include numerical IP addresses, and IPv6
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versions should then be given without enclosing brackets.
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IP addresses can be specified using CIDR notation: an appended slash and
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number specifies the number of "network bits" out of the address to use in the
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comparison (added in 7.86.0). For example "192.168.0.0/16" would match all
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addresses starting with "192.168".
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## `APPDATA` <dir>
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On Windows, this variable is used when trying to find the home directory. If
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the primary home variable are all unset.
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## `COLUMNS` <terminal width>
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If set, the specified number of characters is used as the terminal width when
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the alternative progress-bar is shown. If not set, curl tries to figure it out
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using other ways.
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## `CURL_CA_BUNDLE` <file>
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If set, it is used as the --cacert value. This environment variable is ignored
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if Schannel is used as the TLS backend.
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## `CURL_HOME` <dir>
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If set, is the first variable curl checks when trying to find its home
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directory. If not set, it continues to check *XDG_CONFIG_HOME*
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## `CURL_SSL_BACKEND` <TLS backend>
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If curl was built with support for "MultiSSL", meaning that it has built-in
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support for more than one TLS backend, this environment variable can be set to
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the case insensitive name of the particular backend to use when curl is
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invoked. Setting a name that is not a built-in alternative makes curl stay
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with the default.
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SSL backend names (case-insensitive): **bearssl**, **gnutls**, **mbedtls**,
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**openssl**, **rustls**, **schannel**, **secure-transport**, **wolfssl**
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## `HOME` <dir>
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If set, this is used to find the home directory when that is needed. Like when
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looking for the default .curlrc. *CURL_HOME* and *XDG_CONFIG_HOME*
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have preference.
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## `QLOGDIR` <directory name>
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If curl was built with HTTP/3 support, setting this environment variable to a
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local directory makes curl produce **qlogs** in that directory, using file
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names named after the destination connection id (in hex). Do note that these
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files can become rather large. Works with the ngtcp2 and quiche QUIC backends.
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## `SHELL`
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Used on VMS when trying to detect if using a **DCL** or a **unix** shell.
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## `SSL_CERT_DIR` <dir>
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If set, it is used as the --capath value. This environment variable is ignored
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if Schannel is used as the TLS backend.
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## `SSL_CERT_FILE` <path>
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If set, it is used as the --cacert value. This environment variable is ignored
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if Schannel is used as the TLS backend.
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## `SSLKEYLOGFILE` <filename>
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If you set this environment variable to a filename, curl stores TLS secrets
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from its connections in that file when invoked to enable you to analyze the
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TLS traffic in real time using network analyzing tools such as Wireshark. This
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works with the following TLS backends: OpenSSL, libressl, BoringSSL, GnuTLS
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and wolfSSL.
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## `USERPROFILE` <dir>
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On Windows, this variable is used when trying to find the home directory. If
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the other, primary, variable are all unset. If set, curl uses the path
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**"$USERPROFILE\Application Data"**.
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## `XDG_CONFIG_HOME` <dir>
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If *CURL_HOME* is not set, this variable is checked when looking for a
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default .curlrc file.
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