Make HTTP1Connection and WSGIConnection subclasses of HTTPConnection.

tornado/http1connection.py

@@ -54,7 +54,7 @@ def __init__(self, no_keep_alive=False, chunk_size=None,
         self.body_timeout = body_timeout
         self.use_gzip = use_gzip
 
-class HTTP1Connection(object):
+class HTTP1Connection(httputil.HTTPConnection):
     """Implements the HTTP/1.x protocol.
 
     This class can be on its own for clients, or via `HTTP1ServerConnection`

tornado/httputil.py

@@ -542,8 +542,9 @@ def write_headers(self, start_line, headers, chunk=None, callback=None,
             so that small responses can be written in the same call as their
             headers.
         :arg callback: a callback to be run when the write is complete.
-        :arg has_body: as an optimization, may be ``False`` to indicate
-            that no further writes will be coming.
+        :arg bool has_body: may be false to indicate that this message
+            has no body (and so does not need either a Content-Length
+            or Transfer-Encoding)
 
         Returns a `.Future` if no callback is given.
         """

tornado/wsgi.py

@@ -84,7 +84,7 @@ def __call__(self, environ, start_response):
         return WSGIAdapter(self)(environ, start_response)
 
 
-class _WSGIConnection(object):
+class _WSGIConnection(httputil.HTTPConnection):
     def __init__(self, method, start_response, context):
         self.method = method
         self.start_response = start_response
@@ -99,7 +99,8 @@ def set_close_callback(self, callback):
         # so we can simply ignore the callback.
         pass
 
-    def write_headers(self, start_line, headers, chunk=None, callback=None):
+    def write_headers(self, start_line, headers, chunk=None, callback=None,
+                      has_body=True):
         if self.method == 'HEAD':
             self._expected_content_remaining = 0
         elif 'Content-Length' in headers: