angular-js：为已取消的请求设置HTTP状态代码 [英] angular-js: Set HTTP status code for cancelled requests

问题描述

取消这样的http请求时：

When cancelling an http request like this:

$scope.runTest = function() {
    if (canceler) canceler.resolve();
    canceler = $q.defer();
    $http({
        method: 'GET',
        url: 'http://www.google.com/',
        timeout: canceler.promise
    })
    .success(function(data) {
        $scope.result.push({msg: "this won't be displayed on cancel"});
    })
    .error(function(data) {
        $scope.result.push({msg: "this will be displayed on cancel"});
    });
};

是否可以使取消的HTTP请求具有特定的HTTP代码，如205？它会导致http拦截器被http状态0触发，这也用于超时或没有网络连接。我希望能够区分拦截器中的两个场景

Is it possible to make the cancelled HTTP request have a specific HTTP code, like 205? It causes http interceptors to be triggered with http status 0, which is also used for timeouts or no network connection. I'd like to be able to differentiate between the two scenarios in the interceptors

谢谢！

推荐答案

我最终采用了以下方法：

I ended up with the following approach:

$scope.runTest = function() {

    if (canceler) {
        // Set non-zero status for http interceptors
        // Using 499, an nginx extension to flag cancelled http requests
        // Could be something else like a boolean, using status code for convenience
        canceler.promise.status = 499;

        // Cancel the request
        canceler.resolve();
    }

    canceler = $q.defer();
    $http({
        method: 'GET',
        url: 'http://www.google.com/',
        timeout: canceler.promise
    })
    .success(function(data) {
        // On sucesss
    })
    .error(function(data) {
        // On error
    });
};

这里我只是在超时时设置了一些内容，将请求标记为已取消，正如@Daniel Silva建议的那样。然后在我的http拦截器上：

Here I just set something on the timeout to flag the request as cancelled, as @Daniel Silva suggested. Then on my http interceptor:

app.config(function($httpProvider) {

    $httpProvider.interceptors.push(function($q) {
        return {
            'responseError': function(response) {

                var statusCode = response.status;

                // Get status from timeout, if 0 and timeout present
                if (statusCode === 0 && response.config.timeout) {
                    statusCode = response.config.timeout.status;
                }

                // Ignore client request cancelled
                if (statusCode === 499) {
                    return response;
                }

                // Reject via $q, otherwise the error will pass as success
                return $q.reject(response);
            }
        };
    });
});

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