component AP gateway (http): handle properly NotFound error:

When an `exceptions.NotFound` is received, log a warning message and return the
appropriate HTTP code instead of raising the default `exceptions.InternalError`.

sat/plugins/plugin_comp_ap_gateway/__init__.py

@@ -474,7 +474,7 @@ class APGateway:
                 try:
                     found_item = found_items[0]
                 except IndexError:
-                    raise exceptions.NotFound("requested items can't be found")
+                    raise exceptions.NotFound(f"requested item at {url} can't be found")
 
             if node.startswith(self._events.namespace):
                 # this is an event

sat/plugins/plugin_comp_ap_gateway/http_server.py

@@ -78,14 +78,24 @@ class HTTPAPGServer(web_resource.Resource):
         request.setResponseCode(http_code, None if msg is None else msg.encode())
 
     def _onRequestError(self, failure_: failure.Failure, request: "HTTPRequest") -> None:
-        log.exception(f"Internal error: {failure_.value}")
-        self.responseCode(
-            request,
-            http.INTERNAL_SERVER_ERROR,
-            f"internal error: {failure_.value}"
-        )
+        exc = failure_.value
+        if isinstance(exc, exceptions.NotFound):
+            self.responseCode(
+                request,
+                http.NOT_FOUND,
+                str(exc)
+            )
+        else:
+            log.exception(f"Internal error: {failure_.value}")
+            self.responseCode(
+                request,
+                http.INTERNAL_SERVER_ERROR,
+                f"internal error: {failure_.value}"
+            )
+            request.finish()
+            raise failure_
+
         request.finish()
-        raise failure_
 
     async def webfinger(self, request):
         url_parsed = parse.urlparse(request.uri.decode())