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manpage: add three missing environment variables 

CURL_SSL_BACKEND, QLOGDIR and SSLKEYLOGFILE

Closes #5571
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Daniel Stenberg 2020-06-16 17:36:50 +02:00
parent 83503c7240
commit 477a4e31d7
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18
docs/cmdline-opts/page-footer
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@ -36,7 +36,23 @@ accesses the target URL through the proxy.
The list of host names can also be include numerical IP addresses, and IPv6
versions should then be given without enclosing brackets.
.IP "CURL_SSL_BACKEND <TLS backend>"
If curl was built with support for "MultiSSL", meaning that it has built-in
support for more than one TLS backend, this environment variable can be set to
the case insensitive name of the particular backend to use when curl is
invokved. Setting a name that isn't a built-in alternative, will make curl
stay with the default.
.IP "QLOGDIR <directory name>"
If curl was built with HTTP/3 support, setting this environment variable to a
local directory will make curl produce qlogs in that directory, using file
names named after the destination connection id (in hex). Do note that these
files can become rather large. Works with both QUIC backends.
.IP "SSLKEYLOGFILE <file name>"
If you set this environment variable to a file name, curl will store TLS
secrets from its connections in that file when invoked to enable you to
analyze the TLS traffic in real time using network analyzing tools such as
Wireshark. This works with the following TLS backends: OpenSSL, libressl,
BoringSSL, GnuTLS, NSS and wolfSSL.
.SH "PROXY PROTOCOL PREFIXES"
Since curl version 7.21.7, the proxy string may be specified with a
protocol:// prefix to specify alternative proxy protocols.