关于云通讯跨域，怎么解决？
Access to XMLHttpRequest at 'https://pic.tim.qq.com/v4/openpic/pic_up?websdkappid=537048168&v=1.7.2&platform=10&tinyid=144115213211057880&a2=8559578c1b0269ca170de8932cabb424c85806ae764f3395b92044489910422c3b36af3164c20287365235eb8416b88eb45a6d3871155feda06f5b6fc0267737428197275fdb534a&contenttype=json&sdkappid=1400202952&accounttype=36862&apn=1&reqtime=1558338771' from origin 'http://1XX.1XX.0.35:8080' has been blocked by CORS policy: Request header field content-type is not allowed by Access-Control-Allow-Headers in preflight response.
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