curl_easy_setopt: CURLOPT_USERNAME and CURLOPT_PASSWORD that sort of
  deprecates the good old CURLOPT_USERPWD since they allow applications to set
  the user name and password independently and perhaps more importantly allow
  both to contain colon(s) which CURLOPT_USERPWD doesn't fully support.

examples that I found in the FreeBSD ports system.

page.

  CURLOPT_POST301 (but adds a define for backwards compatibility for you who
  don't define CURL_NO_OLDIES). This option allows you to now also change the
  libcurl behavior for a HTTP response 302 after a POST to not use GET in the
  subsequent request (when CURLOPT_FOLLOWLOCATION is enabled). I edited the
  patch somewhat before commit. The curl tool got a matching --post302
  option. Test case 1076 was added to verify this.

  enabling this feature with CURLOPT_CERTINFO for a request using SSL (HTTPS
  or FTPS), libcurl will gather lots of server certificate info and that info
  can then get extracted by a client after the request has completed with
  curl_easy_getinfo()'s CURLINFO_CERTINFO option. Linus Nielsen Feltzing
  helped me test and smoothen out this feature.

  Unfortunately, this feature currently only works with libcurl built to use
  OpenSSL.

  This feature was sponsored by networking4all.com - thanks!

  CURLOPT_FAILONERROR with FTP to detect if a file exists or not, but it is
  not working: http://curl.haxx.se/mail/lib-2008-07/0295.html

  Server with the correct content-length.  Sending a file with 511 or less
  bytes, content-length 512 is used.  Sending a file with 513 - 1023 bytes,
  content-length 1024 is used.  Files with a length of a multiple of 512 Bytes
  show the correct content-length. Only these files work for upload.
  http://curl.haxx.se/bug/view.cgi?id=2057858

commands to the man pages.

header replacing an internal one

to have a curl_off_t data type no longer gated to off_t.

  curl_multi_socket()
- don't claim that it has an argument named 'easy' because it doesn't!

support this so it goes untested.

incorrectly--the host name is treated as part of the user name and the
port number becomes the password.  This can be observed in test 279
(was KNOWN_ISSUE #54).

as well as IPv4 addresses in IPv6 format. Also, better handle the case
of a malformatted IPv6 address (avoid empty and NULL strings).

  parser to allow numerical IPv6-addresses to be specified with the scope
  given, as per RFC4007 - with a percent letter that itself needs to be URL
  escaped. For example, for an address of fe80::1234%1 the HTTP URL is:
  "http://[fe80::1234%251]/"

  server using the multi interface, the commands are not being sent correctly
  and instead the connection is "cancelled" (the operation is considered done)
  prematurely. There is a half-baked (busy-looping) patch provided in the bug
  report but it cannot be accepted as-is. See
  http://curl.haxx.se/bug/view.cgi?id=2006544

OpenSSL.

defined by the libcurl API. Also changed curl_easy_setopt examples to
pass longs where appropriate.

  non-zero with the fixed value of 1. We should strive at making options
  support '1' for enabling them mentioned explicitly, as that then will allow
  us for to extend them in the future without breaking older programs.