This change adds experimental Metalink support to curl.
To enable Metalink support, run configure with --with-libmetalink.
To feed Metalink file to curl, use --metalink option like this:

  $ curl -O --metalink foo.metalink

We use libmetalink to parse Metalink files.

Updated various references of real domain names to example.com as per
RFC-2606.

Setting bit 2 for this value was documented as having a constant value
defined as CURL_REDIR_POST_303 yet referenced a 302 request.

Additionally corrected the meaning of CURL_REDIR_POST_ALL for all three
bits and fixed problems with the bolding of keywords in this section.

Standardised how RFCs are referenced so that the website may autolink to
the correct documentation on ietf.org. Additionally removed the one link
to RFC3986 on curl.haxx.se.

To achieve this, first new structure HeaderData is defined to hold
necessary data to perform header-related work.  Then tool_header_cb now
receives HeaderData pointer as userdata.  All header-related work
(currently, dumping header and Content-Disposition inspection) are done
in this callback function.  HeaderData.outs->config is used to determine
whether each work is done.

Unit tests were also updated because after this change, curl code always
sets CURLOPT_HEADERFUNCTION and CURLOPT_HEADERDATA.

Tested with -O -J -D, -O -J -i and -O -J -D -i and all worked fine.

Move the SMTP_AUTH constants into a separate header file in
preparation for adding SASL based authentication to POP3 as the two
protocols will need to share them.

Removed DIGEST-MD5 from Section 9.1 Other authentication mechanisms as
the feature was added to SMTP in 7.26.0.

Also corrected small spelling mistake.

Just before 7.26.0 is about to ship

Due to the result code being reset to CURLE_OK when smtp_dophase_done()
was called, postdata would incorrectly be sent to the server when the
MAIL FROM or RCPT command was rejected.

As such, libcurl would return the wrong result code from performing the
operation and additionally set CURLINFO_RESPONSE_CODE to be that
returned by the postdata command.

Bug: http://curl.haxx.se/mail/lib-2012-05/0108.html
Reported by: Gokhan Sengun

In nettle/md5.h, md5_init and md5_update are defined as macros to
nettle_md5_init and nettle_md5_update respectively.  This causes
error when using MD5_params.md5_init and md5_update.  This patch
renames these members as md5_init_func and md5_update_func to
avoid name conflict. For completeness, MD5_params.md5_final was
also renamed as md5_final_func.

The changes in curl_ntlm_core.c is conversion error and fixed by
casting to proper type.

The existing check was wrong so IPv6 support would never be enabled

And mention that this will become 7.26.0

The curl-config command must be used twice in the single command line to
work properly in some environments.

Bug: http://curl.haxx.se/bug/view.cgi?id=3528241
Reported by: Julian Taylor

A dot character at the beginning of a line would not be escaped to a
double dot as required by RFC-2821, instead it would be deleted by the
mail server. Please see section 4.5.2 of the RFC for more information.

Note: This fix also simplifies the detection of repeated CRLF.CRLF
combinations, such as CRLF.CRLF.CRLF, a little rather than having to
advance the eob counter to 2.

Now linking to http://daniel.haxx.se/blog/2012/05/16/300m-users/

The commit e315927a left this in

The variable that control IDN enablement is called USE_IDN within these
Makefiles

It checks whether versioned symbols should be enabled before checking
whether it is possible (i.e. the linker supports --version-script) or
not. This avoids a useless warning when building cURL on a platform that
does not use GNU ld.

Moreover, it fixes broken indentation of this chunk of code.

1 - fix the syntax in the .IP line

2 - Provided user names and passwords are URL decoded by libcurl

Bug: http://curl.haxx.se/bug/view.cgi?id=3525935

... since commit 9a4c887c introduced in libcurl 7.19.4

The built-in user-agent will now only say curl/[version] and nothing
else in an attempt to decrease overhead in HTTP requests.

check whether md5 initialization succeeded before updating digest of
buffers onto it

Roman Mamedov spotted (in
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=670126) that curl would
not complain when given a URL with an IPv6 numerical address without
brackets. It would simply cut off the last ":[hex]" part and thus not
work correctly.

That's a URL using an illegal syntax and now libcurl will instead return
a clear error code and error message detailing the error.

The above mentioned bug report claims this to be a regression but
libcurl does not guarantee functionality when given URLs that aren't
following the URL spec (RFC3986 mostly). I consider the fact that it
used to handle this differently a mere coincidence.