Merge pull request #1522 from turt2live/travis/c2s/http-push-gw-required-path

Require the push gateway URL to be of a specific path

api/client-server/pusher.yaml

@@ -222,7 +222,9 @@ paths:
                     type: string
                     description: |-
                       Required if ``kind`` is ``http``. The URL to use to send
-                      notifications to.
+                      notifications to. MUST be an HTTPS URL with a path of 
+                      ``/_matrix/push/v1/notify``.
+                    example: "https://push-gateway.location.here/_matrix/push/v1/notify"
                   format:
                     type: string
                     description: |-