[QuicTransport] Address comments in pull/22844

Address comments provided in
#22844.

tools/quic/quic_transport_server.py

@@ -56,9 +56,11 @@ def quic_event_received(self, event: QuicEvent) -> None:
                     isinstance(event, StreamDataReceived) and
                     event.stream_id == 2):
                 # client indication process
+                prefix = 'Client inditation error: '
                 self.client_indication_data += event.data
+                if len(self.client_indication_data) > 65535:
+                    raise Exception('too large data for client indication')
                 if event.end_stream:
-                    prefix = 'Client inditation error: '
                     self.process_client_indication()
                     if self.is_closing_or_closed():
                         return

webtransport/quic/handlers/client-indication.quic.py

@@ -12,6 +12,9 @@ async def notify_pass(connection: QuicConnectionProtocol):
     writer.write_eof()
 
 
+# Verifies that the client indication sent by the client is correct. Creates
+# a unidirectional stream containing "PASS" when the check finishes
+# sucessfully.
 def handle_client_indication(connection: QuicConnectionProtocol,
                              origin: str, query: Dict[str, str]):
     logging.log(logging.INFO, 'origin = %s, query = %s' % (origin, query))