每当我制作一个webapp并且我遇到CORS问题时，我就开始煮咖啡了。拧紧它一段时间后，我设法让它工作，但这次不是，我需要帮助。
以下是客户端代码：
$http({method: 'GET', url: 'http://localhost:3000/api/symbol/junk',
headers:{
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, PUT, DELETE, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, X-Requested-With',
'X-Random-Shit':'123123123'
}})
.success(function(d){ console.log( "yay" ); })
.error(function(d){ console.log( "nope" ); });
服务器端是带有快速应用程序的常规node.js。我有一个名为cors的扩展名，它以这种方式表达：
var app = express();
app.configure(function(){
app.use(express.bodyParser());
app.use(app.router);
app.use(cors({origin:"*"}));
});
app.listen(3000);
app.get('/', function(req, res){
res.end("ok");
});
如果我这样做
curl -v -H "Origin: https://github.com" http://localhost:3000/
它回来了：
* Adding handle: conn: 0x7ff991800000
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x7ff991800000) send_pipe: 1, recv_pipe: 0
* About to connect() to localhost port 3000 (#0)
* Trying ::1...
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 3000 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.30.0
> Host: localhost:3000
> Accept: */*
> Origin: https://github.com
>
< HTTP/1.1 200 OK
< X-Powered-By: Express
< Date: Tue, 24 Dec 2013 03:23:40 GMT
< Connection: keep-alive
< Transfer-Encoding: chunked
<
* Connection #0 to host localhost left intact
ok
如果我运行客户端代码，则会出现此错误：
OPTIONS http://localhost:3000/api/symbol/junk No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access. angular.js:7889
XMLHttpRequest cannot load http://localhost:3000/api/symbol/junk. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8000' is therefore not allowed access. localhost/:1
nope
检查Chromes标题：
Request URL:http://localhost:3000/api/symbol/junk
Request Method:OPTIONS
Status Code:200 OK
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8,es;q=0.6,pt;q=0.4
Access-Control-Request-Headers:access-control-allow-origin, accept, access-control-allow-methods, access-control-allow-headers, x-random-shit
Access-Control-Request-Method:GET
Cache-Control:max-age=0
Connection:keep-alive
Host:localhost:3000
Origin:http://localhost:8000
Referer:http://localhost:8000/
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Response Headersview source
Allow:GET
Connection:keep-alive
Content-Length:3
Content-Type:text/html; charset=utf-8
Date:Tue, 24 Dec 2013 03:27:45 GMT
X-Powered-By:Express
检查请求标题我看到我的测试字符串X-Random-Shit出现在“Access-Control-Request-Headers”中，但它的值不存在。另外，在我脑海中，我期待看到我设置的每个标题都有一行，而不是blob。
更新---
我将我的前端改为jQuery而不是Angular，并将我的后端改为：
var app = express();
app.configure(function(){
app.use(express.bodyParser());
app.use(app.router);
});
app.all('*', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header('Access-Control-Allow-Methods', 'OPTIONS,GET,POST,PUT,DELETE');
res.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");
if ('OPTIONS' == req.method){
return res.send(200);
}
next();
});
app.get('/', function(req, res){
res.end("ok");
});
现在它适用于GET，但没有任何其他功能（PUT，POST ..）。
我会看看你们中是否有人提出了解决方案。同时将RESTful概念抛出窗口并使用GET创建所有内容。
答案 0 :(得分：8)
我是AngularJS的新手，我遇到了这个CORS问题，几乎失去了理智！幸运的是我找到了解决这个问题的方法。所以这就是......
我的问题是，当我在发送API请求时使用AngularJS $资源时，我收到此错误消息XMLHttpRequest cannot load http://website.com. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.是的，我已经添加了callback =＆＃34; JSON_CALLBACK＆＃34;它没有用。
我做了什么来解决问题，而不是使用GET方法或诉诸$ http.get，我使用了JSONP。只需用JSONP替换GET方法，并将api响应格式也更改为JSONP。
myApp.factory('myFactory', ['$resource', function($resource) {
return $resource( 'http://website.com/api/:apiMethod',
{ callback: "JSON_CALLBACK", format:'jsonp' },
{
method1: {
method: 'JSONP',
params: {
apiMethod: 'hello world'
}
},
method2: {
method: 'JSONP',
params: {
apiMethod: 'hey ho!'
}
}
} );
}]);
我希望有人觉得这很有帮助。 ：）
答案 1 :(得分：4)
我在表达和编辑res.header方面取得了成功。我的匹配非常接近，但我有一个不同的Allow-Headers，如下所示：
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
我也在使用Angular和Node / Express，但我没有在Angular代码中只调出节点/ express
答案 2 :(得分：1)
在server.js下面添加解决了我的
server.post('/your-rest-endpt/*', function(req,res){
console.log('');
console.log('req.url: '+req.url);
console.log('req.headers: ');
console.dir(req.headers);
console.log('req.body: ');
console.dir(req.body);
var options = {
host: 'restAPI-IP' + ':' + '8080'
, protocol: 'http'
, pathname: 'your-rest-endpt/'
};
console.log('options: ');
console.dir(options);
var reqUrl = url.format(options);
console.log("Forward URL: "+reqUrl);
var parsedUrl = url.parse(req.url, true);
console.log('parsedUrl: ');
console.dir(parsedUrl);
var queryParams = parsedUrl.query;
var path = parsedUrl.path;
var substr = path.substring(path.lastIndexOf("rest/"));
console.log('substr: ');
console.dir(substr);
reqUrl += substr;
console.log("Final Forward URL: "+reqUrl);
var newHeaders = {
};
//Deep-copy it, clone it, but not point to me in shallow way...
for (var headerKey in req.headers) {
newHeaders[headerKey] = req.headers[headerKey];
};
var newBody = (req.body == null || req.body == undefined ? {} : req.body);
if (newHeaders['Content-type'] == null
|| newHeaders['Content-type'] == undefined) {
newHeaders['Content-type'] = 'application/json';
newBody = JSON.stringify(newBody);
}
var requestOptions = {
headers: {
'Content-type': 'application/json'
}
,body: newBody
,method: 'POST'
};
console.log("server.js : routes to URL : "+ reqUrl);
request(reqUrl, requestOptions, function(error, response, body){
if(error) {
console.log('The error from Tomcat is --> ' + error.toString());
console.dir(error);
//return false;
}
if (response.statusCode != null
&& response.statusCode != undefined
&& response.headers != null
&& response.headers != undefined) {
res.writeHead(response.statusCode, response.headers);
} else {
//404 Not Found
res.writeHead(404);
}
if (body != null
&& body != undefined) {
res.write(body);
}
res.end();
});
});
答案 3 :(得分：1)
编写这个中间件可能有所帮助！
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next();
});
答案 4 :(得分：1)
@Swapnil Niwane
我能够通过调用ajax请求并将数据格式化为'jsonp'来解决此问题。
$.ajax({
method: 'GET',
url: url,
defaultHeaders: {
'Content-Type': 'application/json',
"Access-Control-Allow-Origin": "*",
'Accept': 'application/json'
},
dataType: 'jsonp',
success: function (response) {
console.log("success ");
console.log(response);
},
error: function (xhr) {
console.log("error ");
console.log(xhr);
}
});
答案 5 :(得分：0)
我找到了一种在JSONP中直接使用$http方法并在配置对象中支持params的方法：
params = {
'a': b,
'callback': 'JSON_CALLBACK'
};
$http({
url: url,
method: 'JSONP',
params: params
})
答案 6 :(得分：-1)
试试这个：
$.ajax({
type: 'POST',
url: URL,
defaultHeaders: {
'Content-Type': 'application/json',
"Access-Control-Allow-Origin": "*",
'Accept': 'application/json'
},
data: obj,
dataType: 'json',
success: function (response) {
// BindTableData();
console.log("success ");
alert(response);
},
error: function (xhr) {
console.log("error ");
console.log(xhr);
}
});