fix: remove unused import and request for FastAPI in pyproject (#934)

# Description

This PR removes unused imports and dependencies across the project.

Author: guglielmo-san

GEMINI.md

@@ -8,7 +8,7 @@
 
 - **Language**: Python 3.10+
 - **Package Manager**: `uv`
-- **Lead Transports**: FastAPI (REST/JSON-RPC), gRPC
+- **Lead Transports**: Starlette (REST/JSON-RPC), gRPC
 - **Data Layer**: SQLAlchemy (SQL), Pydantic (Logic/Legacy), Protobuf (Modern Messaging)
 - **Key Directories**:
     - `/src`: Core implementation logic.

pyproject.toml

@@ -34,7 +34,7 @@ classifiers = [
 ]
 
 [project.optional-dependencies]
-http-server = ["fastapi>=0.115.2", "sse-starlette", "starlette"]
+http-server = ["sse-starlette", "starlette"]
 encryption = ["cryptography>=43.0.0"]
 grpc = ["grpcio>=1.60", "grpcio-tools>=1.60", "grpcio-status>=1.60", "grpcio_reflection>=1.7.0"]
 telemetry = ["opentelemetry-api>=1.33.0", "opentelemetry-sdk>=1.33.0"]
@@ -107,6 +107,7 @@ style = "pep440"
 
 [dependency-groups]
 dev = [
+  "fastapi>=0.115.2",
   "mypy>=1.15.0",
   "PyJWT>=2.0.0",
   "pytest>=8.3.5",

src/a2a/server/routes/jsonrpc_dispatcher.py

@@ -62,10 +62,7 @@
 logger = logging.getLogger(__name__)
 
 if TYPE_CHECKING:
-    from fastapi import FastAPI
     from sse_starlette.sse import EventSourceResponse
-    from starlette.applications import Starlette
-    from starlette.authentication import BaseUser
     from starlette.exceptions import HTTPException
     from starlette.requests import Request
     from starlette.responses import JSONResponse, Response
@@ -80,11 +77,8 @@
 
     _package_starlette_installed = True
 else:
-    FastAPI = Any
     try:
         from sse_starlette.sse import EventSourceResponse
-        from starlette.applications import Starlette
-        from starlette.authentication import BaseUser
         from starlette.exceptions import HTTPException
         from starlette.requests import Request
         from starlette.responses import JSONResponse, Response
@@ -103,8 +97,6 @@
         # Provide placeholder types for runtime type hinting when dependencies are not installed.
         # These will not be used if the code path that needs them is guarded by _http_server_installed.
         EventSourceResponse = Any
-        Starlette = Any
-        BaseUser = Any
         HTTPException = Any
         Request = Any
         JSONResponse = Any

src/a2a/server/routes/rest_routes.py

@@ -14,25 +14,15 @@
 
 
 if TYPE_CHECKING:
-    from sse_starlette.sse import EventSourceResponse
-    from starlette.requests import Request
-    from starlette.responses import JSONResponse, Response
     from starlette.routing import BaseRoute, Mount, Route
 
     _package_starlette_installed = True
 else:
     try:
-        from sse_starlette.sse import EventSourceResponse
-        from starlette.requests import Request
-        from starlette.responses import JSONResponse, Response
         from starlette.routing import BaseRoute, Mount, Route
 
         _package_starlette_installed = True
     except ImportError:
-        EventSourceResponse = Any
-        Request = Any
-        JSONResponse = Any
-        Response = Any
         Route = Any
         Mount = Any
         BaseRoute = Any