Fix BadRequestError

✅ Solution

BadRequestError in Langchain often arises from sending improperly formatted requests to LLM APIs, such as Anthropic, which can include empty content or disallowed characters like trailing whitespaces in messages. To fix this, implement input validation and sanitization before sending data to the LLM, specifically checking for and removing empty strings or trailing whitespaces in message content. Ensuring that the input adheres strictly to the API's expected format will prevent these errors.