TypeError: b'1' is not JSON serializable
This is happening because you're passing a bytes object in the data dict (b'1', specifically), probably as the value of index. You need to decode it to a str object before json.dumps can work with it:
data = { "body": email.decode('utf-8'), "query_id": index.decode('utf-8'), # decode it here "debug": 1, "client_id": "1", "campaign_id": 1, "meta": {"content_type": "mime"}}