refactor: refactor FastAPI route setup and docs

src/a2a/server/apps/jsonrpc/fastapi_app.py

@@ -2,25 +2,25 @@
 
 from typing import Any
 
-from fastapi import FastAPI, Request, Response
+from fastapi import FastAPI
 
 from a2a.server.apps.jsonrpc.jsonrpc_app import (
     CallContextBuilder,
     JSONRPCApplication,
 )
 from a2a.server.request_handlers.jsonrpc_handler import RequestHandler
 from a2a.types import AgentCard
 from a2a.utils.constants import (
     AGENT_CARD_WELL_KNOWN_PATH,
     DEFAULT_RPC_URL,
     EXTENDED_AGENT_CARD_PATH,
 )
 
 
 logger = logging.getLogger(__name__)
 
 
 class A2AFastAPIApplication(JSONRPCApplication):
     """A FastAPI application implementing the A2A protocol server endpoints.
 
     Handles incoming JSON-RPC requests, routes them to the appropriate
@@ -69,22 +69,13 @@
             rpc_url: The URL for the A2A JSON-RPC endpoint.
             extended_agent_card_url: The URL for the authenticated extended agent card endpoint.
         """
-
-        @app.post(rpc_url)
-        async def handle_a2a_request(request: Request) -> Response:
-            return await self._handle_requests(request)
-
-        @app.get(agent_card_url)
-        async def get_agent_card(request: Request) -> Response:
-            return await self._handle_get_agent_card(request)
+        app.post(rpc_url)(self._handle_requests)
+        app.get(agent_card_url)(self._handle_get_agent_card)
 
         if self.agent_card.supportsAuthenticatedExtendedCard:
-
-            @app.get(extended_agent_card_url)
-            async def get_extended_agent_card(request: Request) -> Response:
-                return await self._handle_get_authenticated_extended_agent_card(
-                    request
-                )
+            app.get(extended_agent_card_url)(
+                self._handle_get_authenticated_extended_agent_card
+            )
 
     def build(
         self,