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-rw-r--r--synapse/http/proxy.py12
-rw-r--r--synapse/http/server.py4
-rw-r--r--synapse/http/site.py2
3 files changed, 14 insertions, 4 deletions
diff --git a/synapse/http/proxy.py b/synapse/http/proxy.py
index 5b5ded757b..97aa429e7d 100644
--- a/synapse/http/proxy.py
+++ b/synapse/http/proxy.py
@@ -62,6 +62,15 @@ HOP_BY_HOP_HEADERS = {
     "Upgrade",
 }
 
+if hasattr(Headers, "_canonicalNameCaps"):
+    # Twisted < 24.7.0rc1
+    _canonicalHeaderName = Headers()._canonicalNameCaps  # type: ignore[attr-defined]
+else:
+    # Twisted >= 24.7.0rc1
+    # But note that `_encodeName` still exists on prior versions,
+    # it just encodes differently
+    _canonicalHeaderName = Headers()._encodeName
+
 
 def parse_connection_header_value(
     connection_header_value: Optional[bytes],
@@ -85,11 +94,10 @@ def parse_connection_header_value(
         The set of header names that should not be copied over from the remote response.
         The keys are capitalized in canonical capitalization.
     """
-    headers = Headers()
     extra_headers_to_remove: Set[str] = set()
     if connection_header_value:
         extra_headers_to_remove = {
-            headers._canonicalNameCaps(connection_option.strip()).decode("ascii")
+            _canonicalHeaderName(connection_option.strip()).decode("ascii")
             for connection_option in connection_header_value.split(b",")
         }
 
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 211795dc39..0d0c610b28 100644
--- a/synapse/http/server.py
+++ b/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)
 
diff --git a/synapse/http/site.py b/synapse/http/site.py
index a5b5780679..af169ba51e 100644
--- a/synapse/http/site.py
+++ b/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