Recently wrote a spring project encountered an error, can't solve, I use the jQuery form is submitted to log in, always prompt Request method 'POST' not supported this error, but when I was in a few days before the deployment of the project, and not to the fault, today suddenly error, jump links and associated controller receives the way I check several times the error is not found, the front desk POST method form is submitted, the background is not specified receiving method, the default should be able to receive the GET and POST methods, I read online explanation seems to be said has something to do with CSRF verification of ajax, specific I also don't understand, have this aspect of the great god something about

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May be much more, or less a space