I have implemented a HTTP transport with custom format which follows Open Telemetry standard. I send the logs to my backend. I'd like to test a format of sent logs. I have already tried to test the output based on a console transport and it worked pretty well but I am going go use separate formats for each transport (OpenTelemetry format for HTTP transport, and a simple format(timestamp, message, level) for console transport). How can I test the custom formatted logs (in json) sending to the backend?