is not dealt with when we find an end-of-response line, as there might be
important stuff even after the correct line. So on subsequent invokes, the
cached data must be used!

responses at once, to excerise the part of curl to make sure it can cache
(parts of) responses properly.

of some problems in the test server :-/

attempting to use EPSV before the standard PASV.

like on my linux box