1 用get的地方

在浏览器中输入url直接访问资源时，用get。get是通过url传参的。

2 用post的地方

2.1 url长度超限时

post是将参数放在http body中的，因此对参数的长度是没有要求的，但是一般的服务器对url的长度都是有要求的，apache http服务器要求url长度不超过4000个字符。

如果参数长度超了，那么就必须要用post。

2.2 对加密要求很高时

get方式传参数会泄漏重要信息。

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