Angular $ http状态（-1） [英] Angular $http status (-1)

问题描述

我通过AngularJs $ HTTP GET 调用后端服务/资源。当它不可用时，它返回 404 ，Chrome网络标签显示它是 404 ，如下所示：

I call a backend service/resource by AngularJs $HTTP GET. When it is not available it returns 404 and Chrome Network tab shows that it is 404 as the followings:

Request Method:OPTIONS
Status Code:404 Not Found

但是在AngularJs $ HTTP 调用结果中，我得到 status = -1 而不是 404 ：

BUT inside AngularJs $HTTP call result, I get status=-1 and not 404:

{data: null, status: -1, config: Object, statusText: ""}

为什么会发生？

NB）
我在后端有一个码头服务并启用了CORS：

NB ) I have a jetty Service on the backend and enabled CORS:

"Access-Control-Allow-Origin":"*"
"Access-Control-Allow-Headers": "origin, content-type, accept, authorization"
"Access-Control-Allow-Methods": "GET, POST, PUT, DELETE, OPTIONS, HEAD"

推荐答案

它返回-1，因为跟踪显示的是，甚至没有发送GET请求。已发送的是飞行前OPTIONS请求，通过返回404，阻止浏览器发送实际的GET请求。

It returns -1 because, as the traces show, the GET request has not even been sent. What has been sent is the pre-flight OPTIONS request, which, by returning 404, prevented the browser to send the actual GET request.

您的服务器不应返回对OPTIONS请求的404响应。它应该返回200响应。

Your server shouldn't return a 404 response for the OPTIONS request. It should return a 200 response.

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