If EPSV, EPRT or LPRT is tried and doesn't work, it will not be retried on
the same server again even if a following request is made using a persistent
connection.

If a second request is made to a server, requesting a file from the same
directory as the previous request operated on, libcurl will no longer make
that long series of CWD commands just to end up on the same spot. Note that
this is only for *exactly* the same dir. There is still room for improvements
to optimize the CWD-sending when the dirs are only slightly different.

Added test 210, 211 and 212 to verify these changes. Had to improve the
test script too and added a new primitive to the test file format.

file that was already completely downloaded caused an error, while it
doesn't if you don't use --fail! I added test case 194 to verify the fix.
Grrr. CURLOPT_FAILONERROR is now added to the list stuff to remove in
libcurl v8 due to all the kludges needed to support it.

and password fields properly in URLs, like
ftp://us?er:pass?word@site.com/. Added test 191 to verify the fix.

CURLOPT_FOLLOWLOCATION, libcurl reported error if a redirect happened even if
the new URL would provide the resumed file. Test case 188 added to verify the
fix (together with existing test 99).

  replacement, curl only replaced the Host: header on the initial request
  and didn't replace it on the following ones. This resulted in requests with
  two Host: headers.

  Now, curl checks if the location is on the same host as the initial request
  and then continues to replace the Host: header. And when it moves to another
  host, it doesn't replace the Host: header but it also doesn't make the
  second Host: header get used in the request.

  This change is verified by the two new test cases 184 and 185.

getting multiple URLs over a single proxy connection

file

PUTs even when told to use HTTP 1.0, which is not correct.

auth

An attempt to repeat a reported auth problem. Works for me!

not be used both in one request. Fixed it and added test case 172 to verify.

set to the domain .a.b.c (that is with a dot prefix). This is now fixed and
test case 171 verifies it.

libcurl.

we can pass on "odd" characters (newline, CR, tab) like this.

  stuff added a few weeks ago.  Turns out that if you specify --proxy-ntlm and
  communicate with a proxy that requires basic authentication, the proxy
  properly returns a 407, but the failure detection code doesn't realize it
  should give up, so curl returns with exit code 0. Test case 162 verifies
  this.

we won't try to QUIT the control connection and risk "hanging" waiting for
a response. Test case 161 verifies this. The quit-sending function was
also made static.

to re-use a connection that is closed when re-used and libcurl should then
make a new fresh connection and use instead