Question

我面对下面的问题，我在7777的另一台服务器上命中了一个文件。平台是node.js吗？

XMLHttpRequest cannot load http://localhost:3000/register_user. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:7777' is therefore not allowed access.

提前致谢！

Answer 1

您可以通过添加Access-Control-Allow-Origin来通过HTTP标头控制此操作。将其设置为Access-Control-Allow-Origin: *将接受来自任何域的跨域AJAX请求。

尝试在app.js文件中添加此内容

var allowCrossDomain = function (req, res, next) {
    res.header('Access-Control-Allow-Origin', '*');
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0');  

    next();
};

然后像这样使用： -

app.use(allowCrossDomain);

Answer 2

我只需要一个域

var allowCrossDomain = function (req, res, next) {
    res.header('Access-Control-Allow-Origin', req.headers.orgigin);
    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS');
    res.header('Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With');
    res.header('Cache-Control', 'no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0');  

    next();
};
app.use(allowCrossDomain);

XMLHttpRequest，请求的资源中没有Access-Control-Allow-Origin

2 个答案: