Fetching port distfiles with the ftp command from githup did not

Fetching port distfiles with the ftp command from githup did not
work when using a https proxy because of a missing host header.
Remember the host form the url and write it into the http request.
Fix the format string when using Proxy-Authorization together with
Cookie.  Also write the http request to the debugging output to
see what is going on.
input jca@; OK sthen@ mpi@