fix: return 404 for invalid URL's for consistency

URL's that are invalid should return a 404, just like any other
invalid URL.

Closes #578

autopush/tests/test_integration.py

@@ -1318,7 +1318,7 @@ def test_with_key(self):
 
         yield client.send_notification(
             vapid=vapid,
-            status=400)
+            status=404)
 
         yield self.shut_down(client)
 

autopush/web/validation.py

@@ -199,7 +199,7 @@ def extract_subscription(self, d):
                 ckey_header=d["ckey_header"],
             )
         except (InvalidTokenException, InvalidToken):
-            raise InvalidRequest("invalid token", errno=102)
+            raise InvalidRequest("invalid token", status_code=404, errno=102)
         return result
 
     @validates_schema(skip_on_field_errors=True)

docs/http.rst

@@ -89,7 +89,6 @@ Unless otherwise specified, all calls return the following error codes:
 -  400 - Bad Parameters
 
    - errno 101 - Missing neccessary crypto keys
-   - errno 102 - Invalid URL endpoint
    - errno 108 - Router type is invalid
    - errno 110 - Invalid crypto keys specified
    - errno 111 - Missing Required Header
@@ -103,6 +102,10 @@ Unless otherwise specified, all calls return the following error codes:
 
    - errno 109 - Invalid authentication
 
+- 404 - Not Found
+
+   - errno 102 - Invalid URL endpoint
+
 -  410 - `{UAID}` or `{CHID}` not found
 
    - errno 103 - Expired URL endpoint