feat/add some precheck

app/httpsig.py

@@ -20,12 +20,17 @@ async def httpsig_checker(
     Check http signature
     """
     payload = await request.json()
+
+    try:
         logger.info(f"headers={request.headers}")
         logger.info(f"{payload=}")
 
         parsec_signature = HttpSignature.parse_signature(
             request.headers.get("signature")
         )
+    except KeyError:
+        logger.warning("Not signature headers")
+        raise KeyError
 
     actor_url = payload["actor"]
     async with httpx.AsyncClient() as client:
@@ -43,6 +48,9 @@ async def httpsig_checker(
         pubkey = _actor["publicKey"]["publicKeyPem"]
     except json.JSONDecodeError:
         raise ValueError
+    except KeyError:
+        logger.warning("actor gone? ")
+        raise KeyError
 
     body = await request.body()
     signture_string = HttpSignature.build_signature_string(