fix: change MAX_CONTENT_LENGTH (for file attachment) in json-rpc to be larger size (10mb) (#518)

# Description The current max content length for file attachment in an A2A request is only 1mb which is too small for most files. Change MAX_CONTENT_LENGTH to be larger size (10mb). (Note currently we only have this limit for json-rpc)

Author: mindpower

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

@@ -91,7 +91,7 @@
  Response = Any
  HTTP_413_REQUEST_ENTITY_TOO_LARGE = Any
 
-MAX_CONTENT_LENGTH = 1_000_000
+MAX_CONTENT_LENGTH = 10_000_000
 
 
 class StarletteUserProxy(A2AUser):

tests/server/apps/jsonrpc/test_serialization.py

@@ -122,30 +122,18 @@ def test_handle_oversized_payload(agent_card_with_api_key: AgentCard):
  app_instance = A2AStarletteApplication(agent_card_with_api_key, handler)
  client = TestClient(app_instance.build())
 
- large_string = 'a' * 2_000_000 # 2MB string
+ large_string = 'a' * 11 * 1_000_000 # 11MB string
  payload = {
  'jsonrpc': '2.0',
  'method': 'test',
  'id': 1,
  'params': {'data': large_string},
  }
 
- # Starlette/FastAPI's default max request size is around 1MB.
- # This test will likely fail with a 413 Payload Too Large if the default is not increased.
- # If the application is expected to handle larger payloads, the server configuration needs to be adjusted.
- # For this test, we expect a 413 or a graceful JSON-RPC error if the app handles it.
-
- try:
- response = client.post('/', json=payload)
- # If the app handles it gracefully and returns a JSON-RPC error
- if response.status_code == 200:
- data = response.json()
- assert data['error']['code'] == InvalidRequestError().code
- else:
- assert response.status_code == 413
- except Exception as e:
- # Depending on server setup, it might just drop the connection for very large payloads
- assert isinstance(e, ConnectionResetError | RuntimeError)
+ response = client.post('/', json=payload)
+ assert response.status_code == 200
+ data = response.json()
+ assert data['error']['code'] == InvalidRequestError().code
 
 
 def test_handle_unicode_characters(agent_card_with_api_key: AgentCard):