a username in the URL, as libcurl normally requires a username for
authentication.
+http.extraHeader::
+ Pass an additional HTTP header when communicating with a server. If
+ more than one such entry exists, all of them are added as extra
+ headers. To allow overriding the settings inherited from the system
+ config, an empty value will reset the extra headers to the empty list.
+
http.cookieFile::
File containing previously stored cookie lines which should be used
in the Git http session, if they match the server. The file format