这个功能有什么用？

Question

功能如下：

def cors_handler(request, response):
    response.set_header("Access-Control-Allow-Origin", "*")
    response.set_header("Access-Control-Allow-Headers", "Content-Type")
    response.set_header("Access-Control-Allow-Methods", "POST")
    response.set_status(204)
    response.send("")