3 files changed, 6 insertions, 6 deletions
diff --git a/synapse/http/federation/matrix_federation_agent.py b/synapse/http/federation/matrix_federation_agent.py
index a8a520f809..2f0177f1e2 100644
--- a/synapse/http/federation/matrix_federation_agent.py
+++ b/synapse/http/federation/matrix_federation_agent.py
@@ -239,7 +239,7 @@ class MatrixHostnameEndpointFactory:
 
         self._srv_resolver = srv_resolver
 
-    def endpointForURI(self, parsed_uri: URI):
+    def endpointForURI(self, parsed_uri: URI) -> "MatrixHostnameEndpoint":
         return MatrixHostnameEndpoint(
             self._reactor,
             self._proxy_reactor,
diff --git a/synapse/http/federation/srv_resolver.py b/synapse/http/federation/srv_resolver.py
index f68646fd0d..de0e882b33 100644
--- a/synapse/http/federation/srv_resolver.py
+++ b/synapse/http/federation/srv_resolver.py
@@ -16,7 +16,7 @@
 import logging
 import random
 import time
-from typing import Callable, Dict, List
+from typing import Any, Callable, Dict, List
 
 import attr
 
@@ -109,7 +109,7 @@ class SrvResolver:
 
     def __init__(
         self,
-        dns_client=client,
+        dns_client: Any = client,
         cache: Dict[bytes, List[Server]] = SERVER_CACHE,
         get_time: Callable[[], float] = time.time,
     ):
diff --git a/synapse/http/federation/well_known_resolver.py b/synapse/http/federation/well_known_resolver.py
index 43f2140429..71b685fade 100644
--- a/synapse/http/federation/well_known_resolver.py
+++ b/synapse/http/federation/well_known_resolver.py
@@ -74,9 +74,9 @@ _well_known_cache: TTLCache[bytes, Optional[bytes]] = TTLCache("well-known")
 _had_valid_well_known_cache: TTLCache[bytes, bool] = TTLCache("had-valid-well-known")
 
 
-@attr.s(slots=True, frozen=True)
+@attr.s(slots=True, frozen=True, auto_attribs=True)
 class WellKnownLookupResult:
-    delegated_server = attr.ib()
+    delegated_server: Optional[bytes]
 
 
 class WellKnownResolver:
@@ -336,4 +336,4 @@ def _parse_cache_control(headers: Headers) -> Dict[bytes, Optional[bytes]]:
 class _FetchWellKnownFailure(Exception):
     # True if we didn't get a non-5xx HTTP response, i.e. this may or may not be
     # a temporary failure.
-    temporary = attr.ib()
+    temporary: bool = attr.ib()