甚至在进行设置时，访问控制-允许-起源问题 [英] Access-Control-Allow-Origin issues even on setting it up

问题描述

我的nodejs/express包括:

My nodejs/express includes:

app.use(function handleAppError(err, req, res, next) {
    const msg = 'ERROR: App error: ' + util.inspect(err);
     // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', '*');

    console.log(msg);
    if (res.headersSent) {
        next(err);
    } else {
        res.status(500).send(msg);
    }
});

…但是在拨打电话时，我仍然遇到Chrome错误:

…but on making a call, I still end up with an error in Chrome:

XMLHttpRequest无法加载http://:8080/management-api/v1/bots. 对预检请求的响应未通过访问控制检查:否 请求中存在"Access-Control-Allow-Origin"标头 资源.因此，不允许使用来源" http://localhost:8100 " 访问.

XMLHttpRequest cannot load http://:8080/management-api/v1/bots. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access.

推荐答案

您需要处理OPTIONS方法. 试试这个

You need to handle the OPTIONS method. Try this

app.all("/*", function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "Cache-Control, Pragma, Origin, Authorization, Content-Type, X-Requested-With");
    res.header("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE");
    if (req.method === "OPTIONS")
        res.send(200);
    else
        next();
});

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