Add return types to PUT, POST and PATCH methods.

Also add return types for proxy and redirect handlers.

api/swagger-spec/api.json

@@ -24,4 +24,4 @@
     ]
    }
   ]
- }
+ }

api/swagger-spec/resourceListing.json

@@ -27,4 +27,4 @@
    "title": "",
    "description": ""
   }
- }
+ }

api/swagger-spec/version.json

@@ -24,4 +24,4 @@
     ]
    }
   ]
- }
+ }