Failed to load <service url>: Request header field x-ijt is not allowed by Access-Control-Allow-Headers in preflight response.

使用pycharm，tornado写了后台，仍然使用pycharm写了前端代码，运行后出现以下错误：

Failed to load <service url>: Request header field x-ijt is not allowed by Access-Control-Allow-Headers in preflight response.

跨域问题

解决

添加pycharm的Chrome扩展

右键该扩展，点击菜单中的“选项”:

填写后，应用。

再次访问，该错误消失。

参考：CORS Control in JetBrains Chrome Extension