仅移动CORS错误：Node.js中的Access-Control-Allow-Origin不允许起源 [英] Mobile only CORS Error: Origin is not allowed by Access-Control-Allow-Origin In Node.js

问题描述

我已经为CORS设置了Node.js（在Google Cloud Platform [GCP]上托管的TypeScript）应用，但是在移动设备上，我仍然收到错误消息（Access-Control-Allow-Origin不允许使用Origin） -desktop可以正常工作。

I've set up a Node.js (TypeScript hosted on Google Cloud Platform [GCP]) app for CORS but I'm still getting errors (Origin is not allowed by Access-Control-Allow-Origin) on mobile--desktop works fine.

我已经搜索过，但是对于设置此设置有很多疑问，我无法找到为什么它不能正常工作

I've searched but there are so many questions about getting this set up in general, I can't find why it specifically isn't working for mobile.

    this.app.use(cors()); 
    this.app.options('*', cors());

...

    router.use(function(req, res, next) {
          res.header('Content-Type', 'application/json');
          res.setHeader('Access-Control-Allow-Origin', '*');
          res.setHeader('Access-Control-Allow-Methods', 'DELETE,GET,OPTIONS,PATCH,POST');
          res.setHeader('Access-Control-Allow-Headers', 'Origin, Accept, Authorization, Content-Type, X-Requested-With, Access-Control-Allow-Headers, Access-Control-Request-Method, Access-Control-Request-Headers');
          next();
        });

BTW错误只有在页面加载几分钟后才会出现在控制台中。 （我删除了有效的URL。）

BTW The errors don't appear in the console until a few minutes after the page has loaded. (I've removed the URLs which are valid.)

由于访问控制检查，XMLHttpRequest无法加载。

"XMLHttpRequest cannot load due to access control checks."

无法加载资源：Access-Control-Allow-Origin不允许起源。

"Failed to load resource: Origin is not allowed by Access-Control-Allow-Origin."

推荐答案

问题DB中缺少数据，因此Node端点未正确返回。错误与问题无关。

The issue was missing data in the DB, so the Node endpoint was not returning properly. The errors had nothing to do with the problem.

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