Enable trust_env in ClientSession for improved proxy handling

Author: danyi1212

horizon/opal_relay_api.py

@@ -95,7 +95,7 @@ def _apply_context(self, context: dict[str, str]):
     def api_session(self) -> ClientSession:
         if self._api_session is None:
             env_api_key = get_env_api_key()
-            self._api_session = ClientSession(headers={"Authorization": f"Bearer {env_api_key}"})
+            self._api_session = ClientSession(headers={"Authorization": f"Bearer {env_api_key}"}, trust_env=True)
         return self._api_session
 
     async def relay_session(self) -> ClientSession:
@@ -133,7 +133,9 @@ async def relay_session(self) -> ClientSession:
                         f"Server responded to token request with an invalid result: {text}",
                     ) from e
             self._relay_token = obj.token
-            self._relay_session = ClientSession(headers={"Authorization": f"Bearer {self._relay_token}"})
+            self._relay_session = ClientSession(
+                headers={"Authorization": f"Bearer {self._relay_token}"}, trust_env=True
+            )
         return self._relay_session
 
     async def send_ping(self):