应用程序可以使用Ajax实现自动保存，但前提是表单应提供传统的提交按钮或使用同步请求发送数据以做处理。

Applications can use Ajax for auto-saving, but your forms should either provide good old submit buttons or use synchronous requests for sending the data for processing.

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HEADER请求不向服务器发送任何数据。

HEADER requests do not send any data to a server.

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在使用GET请求发送大块数据时，对UR l字符串有长度限制。

You're sending potentially huge chunks of data using a GET request, which has a length limitation on the URL string.

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