Always set proper 'Host' header

would default to localhost:80 otherwise and that
confuses e.g. Google App Engine

Author: peritus

src/HttpLibrary/__init__.py

@@ -37,6 +37,7 @@ class Context(object):
         def __init__(self, http, host=None):
             # daddy
             self._http = http
+            self._host = host
 
             # the livetest app
             if host:
@@ -85,6 +86,8 @@ def post_process_request(self, response):
             # fail
             self.next_request_should = True
             self.request_headers = {}
+            if self._host != None:
+                self.request_headers['Host'] = self._host
             self.request_body = None
 
             # check flag set by "Next Request Should Succeed"