vcs: Remove custom response header which contains backend key.

We used this custom header to skip the error handling.
This is no linger needed since the VCS middleware is moved above of the error handling.

rhodecode/lib/middleware/simplesvn.py

@@ -89,10 +89,6 b' class SimpleSvnApp(object):'
             if h.lower() not in self.IGNORED_HEADERS
         ]
 
-        # Add custom response header to indicate that this is a VCS response
-        # and which backend is used.
-        headers.append(('X-RhodeCode-Backend', 'svn'))
-
         return headers
 
 

rhodecode/lib/middleware/utils/scm_app_http.py

@@ -116,10 +116,6 b' class VcsHttpProxy(object):'
             if not wsgiref.util.is_hop_by_hop(h)
         ]
 
-        # Add custom response header to indicate that this is a VCS response
-        # and which backend is used.
-        response_headers.append(('X-RhodeCode-Backend', self._backend))
-
         # TODO: johbo: Better way to get the status including text?
         status = str(response.status_code)
         start_response(status, response_headers)

rhodecode/lib/middleware/utils/wsgi_app_caller_client.py

@@ -94,10 +94,6 b' class RemoteAppCaller(object):'
             data, status, headers = self._remote_wsgi.handle(
                 clean_environ, input_data, *self._args, **self._kwargs)
 
-        # Add custom response header to indicate that this is a VCS response
-        # and which backend is used.
-        headers.append(('X-RhodeCode-Backend', self._backend))
-
         log.debug("Got result from proxy, returning to WSGI container")
         start_response(status, headers)
 

rhodecode/tests/lib/middleware/test_simplesvn.py

@@ -157,7 +157,6 b' class TestSimpleSvnApp(object):'
         expected_headers = [
             ('MS-Author-Via', 'DAV'),
             ('SVN-Supported-Posts', 'create-txn-with-props'),
-            ('X-RhodeCode-Backend', 'svn'),
         ]
         response_headers = self.app._get_response_headers(headers)
         assert sorted(response_headers) == sorted(expected_headers)
@@ -192,7 +191,6 b' class TestSimpleSvnApp(object):'
         expected_response_headers = [
             ('SVN-Supported-Posts', 'create-txn-with-props'),
             ('MS-Author-Via', 'DAV'),
-            ('X-RhodeCode-Backend', 'svn'),
         ]
         request_mock.assert_called_once_with(
             self.environment['REQUEST_METHOD'], expected_url,