Ticket #3496: wsgi_patch.diff

django/core/handlers/wsgi.py

@@ -160 +160 @@
             try:
                 # CONTENT_LENGTH might be absent if POST doesn't have content at all (lighttpd)
                 content_length = int(self.environ.get('CONTENT_LENGTH', 0))
+                has_content_length = True
             except ValueError: # if CONTENT_LENGTH was empty string or not an integer
                 content_length = 0
-            safe_copyfileobj(self.environ['wsgi.input'], buf, size=content_length)
+                has_content_length = False
+            
+            if has_content_length and content_length == 0:
+                # A case when HTML form containing only empty checkboxes 
+                # is submitted. It POSTs zero length HTTP request.
+                #
+                # Socket read doesn't return if we pass size=0
+                # forward this point and Django request handling hangs.
+                pass
+            else:                 
+                safe_copyfileobj(self.environ['wsgi.input'], buf, size=content_length)
+            
             self._raw_post_data = buf.getvalue()
             buf.close()
             return self._raw_post_data