Round 3 fixes: cancelled polling, aggregator invalid_count, filter state, scheduler atomicity, HTTP exception handler, tests

app/api/errors.py

@@ -1,6 +1,7 @@
 """统一异常处理"""
 from fastapi import Request
 from fastapi.responses import JSONResponse
+from starlette.exceptions import HTTPException as StarletteHTTPException
 from pydantic import ValidationError
 from app.core.exceptions import ProxyPoolException
 from app.core.log import logger
@@ -13,6 +14,13 @@ async def proxy_pool_exception_handler(request: Request, exc: ProxyPoolException
     )
 
 
+async def http_exception_handler(request: Request, exc: StarletteHTTPException):
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"code": exc.status_code, "message": exc.detail, "data": None},
+    )
+
+
 async def pydantic_validation_handler(request: Request, exc: ValidationError):
     logger.error(f"Validation error: {exc}")
     return JSONResponse(