This changeset does two things: introduces a new RemoteDisconnected exception
(that subclasses ConnectionResetError and BadStatusLine) so that a remote
server disconnection can be detected by client code (and provides a better
error message for debugging purposes), and ensures that the client socket is
closed if a ConnectionError happens, so that the automatic re-connection code
can work if the application handles the error and continues on.
Tests are added that confirm that a connection is re-used or not re-used
as appropriate to the various combinations of protocol version and headers.
Patch by Martin Panter, reviewed by Demian Brecht. (Tweaked only slightly by
me.)
Some http servers will reject PUT, POST, and PATCH requests if they
do not have a Content-Length header.
Patch by James Rutherford, with additional cleaning up of the
'request' documentation by me.
Setting attributes key, value and coded_value directly now is deprecated.
update() and setdefault() now transform and check keys. Comparing for
equality now takes into account attributes key, value and coded_value.
copy() now returns a Morsel, not a dict. repr() now contains all attributes.
Optimized checking keys and quoting values. Added new tests.
Original patch by Demian Brecht.
