http获取NodeJS如何获取错误状态码？ [英] http get NodeJS how to get error status code?

问题描述

好吧，我必须密集，因为在使用Node.JS http.get或http.request时我无法找到任何地方如何获取错误状态代码。我的代码：

OK, I must be dense since I cannot find anywhere how to get the error status codes when using Node.JS http.get or http.request. My code:

    var deferred = $q.defer();

    var req = https.get(options, function(response){
        var str = '';
        response.on('data', function (chunk) {
            str += chunk;
        });
        response.on('end', function () {
            console.log("[evfService] Got user info: "+str);
            deferred.resolve(str);
        });


    });

    req.on('error', function(e){
       deferred.reject(e);
    });

在req.on位中，我想要的是http状态代码（即401， 403等）。我得到的是一个半无用的错误对象，它不会给我代码或对响应对象的任何引用。我试过拦截函数（响应）回调，但是当有404时，它永远不会被调用。

In that "req.on" bit, what I want is the http status code (i.e. 401, 403, etc.). What I get is a semi-useless error object that does not give me the code or any reference to the response object. I have tried intercepting in the function(response) callback, but when there is a 404, it never gets called.

谢谢！

推荐答案

无论来自服务器的响应状态代码如何调用您的回调，因此在回调中，请检查 response.statusCode 。也就是说，4xx状态代码不是您正在处理的级别的错误;服务器响应，只是服务器回应说资源不可用（等等）

Your callback gets called regardless of the response status code from the server, so within your callback, check response.statusCode. That is, a 4xx status code isn't an error at the level you're working at; the server responded, it's just that the server responded by saying the resource wasn't available (etc.)

这是，但特征模糊。以下是他们提供的示例，注释指向相关位：

This is in the documentation but characteristically vague. Here's the example they give, with a comment pointing to the relevant bit:

var https = require('https');

https.get('https://encrypted.google.com/', function(res) {
  console.log("statusCode: ", res.statusCode); // <======= Here's the status code
  console.log("headers: ", res.headers);

  res.on('data', function(d) {
    process.stdout.write(d);
  });

}).on('error', function(e) {
  console.error(e);
});

如果您尝试使用（比如说）未知资源，您会看到 statusCode：404 。

If you try that with (say) an unknown resource, you'll see statusCode: 404.

所以对于你正在做的事情，你可能会想要这样的事情：

So for what you're doing, you may want something like this:

var deferred = $q.defer();

var req = https.get(options, function (response) {
    var str = '';

    if (response.statusCode < 200 || response.statusCode > 299) { // (I don't know if the 3xx responses come here, if so you'll want to handle them appropriately
        deferred.reject(/*...with appropriate information, including statusCode if you like...*/);
    }
    else {
        response.on('data', function (chunk) {
            str += chunk;
        });
        response.on('end', function () {
            console.log("[evfService] Got user info: " + str);
            deferred.resolve(str);
        });
    }
});

req.on('error', function (e) {
    deferred.reject(/*...with appropriate information, but status code is irrelevant [there isn't one]...*/);
});

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