使用 Express 检测 NodeJS 上的 AJAX 请求
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15945118/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Detecting AJAX requests on NodeJS with Express
提问by michael
I'm using NodeJS with Express. How can I tell the difference between an ordinary browser request and an AJAX request? I know I could check the request headers but does Node/Exprsss expose this information?
我在 Express 中使用 NodeJS。如何区分普通浏览器请求和 AJAX 请求？我知道我可以检查请求头，但是 Node/Exprsss 会公开这些信息吗？
回答by robertklep
Most frameworks set the X-Requested-Withheader to XMLHttpRequest, for which Express has a test:
大多数框架将X-Requested-With标头设置XMLHttpRequest为 ，Express 对此进行了测试：
app.get('/path', function(req, res) {
var isAjaxRequest = req.xhr;
...
});
回答by kumarharsh
In case the req.xhris not set, say in frameworks such as Angularjs, where it was removed, then you should also check whether the header can accept a JSON response (or XML, or whatever your XHR sends as a response instead of HTML).
如果req.xhr未设置，例如在 Angularjs 等框架中删除了它，那么您还应该检查标头是否可以接受 JSON 响应（或 XML，或者您的 XHR 作为响应而不是 HTML 发送的任何内容）。
if (req.xhr || req.headers.accept.indexOf('json') > -1) {
// send your xhr response here
} else {
// send your normal response here
}
Of course, you'll have to tweak the second part a little to match your usecase, but this should be a more complete answer.
当然，您必须稍微调整第二部分以匹配您的用例，但这应该是一个更完整的答案。
Ideally, the angular team should not have removed it, but should have actually found a better solution for the CORS' pre-flight problem, but that's how it rests now...
理想情况下，angular 团队不应该删除它，但实际上应该为 CORS 的飞行前问题找到更好的解决方案，但现在就是这样......
