Fix RemoteProtocolError

✅ Solution

The "RemoteProtocolError" in httpx often arises when the connection state is unexpectedly modified during data reception, such as when a deque for buffering data is altered while being iterated. To fix this, ensure thread safety when accessing shared resources like deques or dictionaries, using appropriate locking mechanisms or copy the data structure before iteration. Additionally, scrutinize custom transport implementations for race conditions that may trigger concurrent modifications.