角$ HTTP超时返回undefined [英] Angular $http timeout returning undefined

问题描述

我只是测试用角的$ HTTP模块的超时功能，但它一直返回undefined作为响应

I'm just testing the timeout functionality with Angular's $http module, however it keeps returning undefined as the response

这是罚款，如果设置就是这样的，但如果我钉在 .error（功能）而不是。然后（功能），到 $ HTTP 呼叫时，它抛出试图从一个未定义的对象获取数据字段中的错误

It's fine if set up just like this, but if I tack on .error(function) instead of .then(function), to the $http call, it throws an error trying to grab the data field from an undefined object

var timeout = $q.defer();

var config = {
        url: 'http://192.168.1.65:3000',
        timeout: timeout.promise,
        method: 'POST'
    };

    $http(config).then(function(res) {
        // This is always undefined when timeout occurs
        console.log(res);
    });

    $timeout(function() {
        console.log('resolving the promise to abort the http call. This works fine');
        timeout.resolve();
    }, 1000);

任何想法我做错了吗？

Any ideas what I'm doing wrong?

推荐答案

在 $ HTTP 倍出，它返回一个拒绝承诺，你可以用<$ C处理$ C> .catch ：

When $http times-out, it returns a rejected promise that you can handle with .catch:

$http(config)
  .then(function(response){
  })
  .catch(function(error){
     // will fire when timed out
  })

演示

题外话：它实际上是简单的只使用由 $超时，产生无需 $ q.defer ：

Off-topic: it's actually simpler to just use the promise generated by $timeout, without the need for $q.defer:

var timeout = $timeout(angular.noop, 1000);
$http.get(url, {timeout: timeout})
     .then(...)
     .catch(...)

编辑：

在情况下，有一个拦截器，则超时将导致 responseError ，如果定义，拦截器基本上是处理的错误，使之不再成为拒绝承诺并将结果发送到。然后 - 如果你不返回从 responseError 函数的任何信息，数​​据传递到。然后处理程序未定义。如果你想保留拒绝，你可以这样做：

In case there is an interceptor, then the timeout would result in responseError, and if defined, that interceptor essentially "handles" the error so it no longer becomes a rejected promise and the result is routed to .then - and if you do not return anything from the responseError function, the data passed to the .then handler is undefined. If you want to keep the rejection, you can do:

// inside http inteceptor
responseError: function(rejection){

  if (rejection.status === 0){ // if timeout
    return $q.reject({reason: "timeout"});
  }
  // ...
}

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