CURLOPT_SSL_CTX_FUNCTION to set a callback that gets called with the
   OpenSSL's ssl_ctx pointer passed in and allow a callback to act on it. If
   anything but CURLE_OK is returned, that will also be returned by libcurl
   all the way back. If this function changes the CURLOPT_URL, libcurl will
   detect this and instead go use the new URL.

   CURLOPT_SSL_CTX_DATA is a pointer you set to get passed to the callback set
   with CURLOPT_SSL_CTX_FUNCTION.

a "plain" Negotiate as well.

to add more method in the future.

added.

defines in the public external header files

disables the host name check in the FOLLOWLOCATION code. With that option
set, libcurl will send user+password to all hosts.

the design draft mentioned and what I think is fit

decreased the write buffer size to 16KB to perform a lot better on Windows(!)

for storage and retrieval of private data in the curl handle.

CURLE_OPERATION_TIMEOUTED

too, as Emiliano Ida has confirmed it to work

adjustments and possibly some improvments to feature all those things we
could possibly want from this.

fallback to the old ftp-one to make old programs work the same

directive.