Fix and hush Mypy errors

synapse/http/proxy.py

@@ -64,7 +64,7 @@ HOP_BY_HOP_HEADERS = {
 
 if hasattr(Headers, "_canonicalNameCaps"):
     # Twisted < 24.7.0rc1
-    _canonicalHeaderName = Headers()._canonicalNameCaps
+    _canonicalHeaderName = Headers()._canonicalNameCaps  # type: ignore[attr-defined]
 else:
     # Twisted >= 24.7.0rc1
     # But note that `_encodeName` still exists on prior versions,

synapse/http/server.py

@@ -74,6 +74,7 @@ from synapse.api.errors import (
 from synapse.config.homeserver import HomeServerConfig
 from synapse.logging.context import defer_to_thread, preserve_fn, run_in_background
 from synapse.logging.opentracing import active_span, start_active_span, trace_servlet
+from synapse.types import ISynapseReactor
 from synapse.util import json_encoder
 from synapse.util.caches import intern_dict
 from synapse.util.cancellation import is_function_cancellable
@@ -868,7 +869,8 @@ async def _async_write_json_to_request_in_thread(
 
     with start_active_span("encode_json_response"):
         span = active_span()
-        json_str = await defer_to_thread(request.reactor, encode, span)
+        reactor: ISynapseReactor = request.reactor  # type: ignore
+        json_str = await defer_to_thread(reactor, encode, span)
 
     _write_bytes_to_request(request, json_str)
 

synapse/http/site.py

@@ -683,7 +683,7 @@ class SynapseSite(ProxySite):
         self.access_logger = logging.getLogger(logger_name)
         self.server_version_string = server_version_string.encode("ascii")
 
-    def log(self, request: SynapseRequest) -> None:
+    def log(self, request: SynapseRequest) -> None:  # type: ignore[override]
         pass
 
 

tests/rest/client/test_login.py

@@ -969,7 +969,7 @@ class CASTestCase(unittest.HomeserverTestCase):
         # Test that the response is HTML.
         self.assertEqual(channel.code, 200, channel.result)
         content_type_header_value = ""
-        for header in channel.headers.getRawHeaders("Content-Type"):
+        for header in channel.headers.getRawHeaders("Content-Type", []):
             content_type_header_value = header
 
         self.assertTrue(content_type_header_value.startswith("text/html"))