现象：

本地运行工程在浏览器上执行post动作一切正常，但是打包成app后报错599：http failure response for(unknown url)。此错误非常奇怪，百思不得解，突然灵机一动，有了如下解决方案。

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解决方案：

post请求body之前不需要传值所以设置为null，现在必须将body改为{}才可以解决报错。