Support both versions of Starlette

Don't lock starlette version

Author: SrzStephen

pyproject.toml

@@ -29,7 +29,7 @@ classifiers = [
 ]
 
 [project.optional-dependencies]
-http-server = ["fastapi>=0.115.2", "sse-starlette", "starlette>=0.48.0"]
+http-server = ["fastapi>=0.115.2", "sse-starlette", "starlette"]
 encryption = ["cryptography>=43.0.0"]
 grpc = ["grpcio>=1.60", "grpcio-tools>=1.60", "grpcio_reflection>=1.7.0"]
 telemetry = ["opentelemetry-api>=1.33.0", "opentelemetry-sdk>=1.33.0"]

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

@@ -64,7 +64,14 @@
     from starlette.exceptions import HTTPException
     from starlette.requests import Request
     from starlette.responses import JSONResponse, Response
-    from starlette.status import HTTP_413_CONTENT_TOO_LARGE
+
+    try:
+        # Starlette v0.48.0
+        from starlette.status import HTTP_413_CONTENT_TOO_LARGE
+    except ImportError:
+        from starlette.status import (
+            HTTP_413_REQUEST_ENTITY_TOO_LARGE as HTTP_413_CONTENT_TOO_LARGE,
+        )
 
     _package_starlette_installed = True
 else:
@@ -76,7 +83,14 @@
         from starlette.exceptions import HTTPException
         from starlette.requests import Request
         from starlette.responses import JSONResponse, Response
-        from starlette.status import HTTP_413_CONTENT_TOO_LARGE
+
+        try:
+            # Starlette v0.48.0
+            from starlette.status import HTTP_413_CONTENT_TOO_LARGE
+        except ImportError:
+            from starlette.status import (
+                HTTP_413_REQUEST_ENTITY_TOO_LARGE as HTTP_413_CONTENT_TOO_LARGE,
+            )
 
         _package_starlette_installed = True
     except ImportError: