JMeter you can't log in when recording an app

　　Problem Description:

While recording the app, everything else went well, but when you logged in, you were prompted with "Unknown server error, please try again later". At first thought is the interface problem, with the Python script called Under, is able to log on, troubleshooting interface problems. Baidu a bit, but did not find a solution.

　Workaround:

Later, I studied the next, found to modify the HTTP sampler settings inside the type, choose Java can solve the problem of login.

JMeter you can't log in when recording an app