飞行前响应中的Access-Control-Allow-Headers不允许请求标头字段Access-Control-Allow-Origin [英] Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers in preflight response
问题描述
尝试加载网页时出现以下错误:飞行前响应中的Access-Control-Allow-Headers不允许请求标头字段Access-Control-Allow-Origin.
I get the following error in when I try to load a my webpage: Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers in preflight response.
我查看了其他针对此问题的答案,它们表明缺少CORS支持.令人困惑的是我得到了cors的支持!至少我认为是.
I have looked at other answers that respond to this issue and they indicate lack of CORS support. The confusing thing is that I have cors support! At least I think I do.
我正在尝试将Zingchart连接到我的Angular JS前端,并使用AJAX请求从我的REST API(在本地主机:3000)获取数据
I am trying to connect Zingchart to my Angular JS front end and using an AJAX request to get data from my REST API (at localhost:3000)
这是我的AJAX电话:
Here is my AJAX call:
window.feed = function(callback) {
$.ajax({
type: "GET",
dataType: "json",
headers: {
Accept: "application/json",
"Access-Control-Allow-Origin": "*"
},
url: "http://localhost:3000/readings",
success: function (data) {
var mem = data.mem.size/10000;
var tick = {
plot0: parseInt(mem)
};
callback(JSON.stringify(tick));
}
});
我的REST API实现包括以下内容:
My REST API implementation includes the following:
// CORS Support
app.use(function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*');
res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
res.header('Access-Control-Allow-Headers', 'Content-Type');
next();
});
我的REST API是在本教程的帮助下构建的: https://www.youtube. com/watch?v = OhPFgqHz68o
My REST API was built with the help of this tutorial: https://www.youtube.com/watch?v=OhPFgqHz68o
推荐答案
取出"headers"
和"dataType"
.您的请求将如下所示:
Take out the "headers"
and "dataType"
. Your request will then look like this:
$.ajax({
type: "GET",
url: "http://localhost:3000/readings",
success: function (data) {
var mem = data.mem.size/10000;
var tick = {
plot0: parseInt(mem)
};
callback(JSON.stringify(tick));
}
});
您的标题正在触发预检请求.
Your headers are triggering the preflight request.
如果您使用的是Angular,我会高度建议不要将jQuery用于AJAX,而应使用Angular的
If you're using Angular, I'd highly suggest not using jQuery for AJAX and instead use Angular's built-in $http service.
我在ZingChart团队中. Holler,如果我们可以为您提供图表方面的帮助.
I'm on the ZingChart team. Holler if we can help with your charts.
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