No 'Access-Control-Allow-Origin' header is

2019-01-04 09:39发布

XMLHttpRequest cannot load http://mywebservice. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:9000' is therefore not allowed access.

I get this error when I try to run my web-service from inside my code. I tried finding about it and tried many solutions which were suggested which I found on net. Pasting the code below.

<form name="LoginForm" ng-controller="LoginCtrl" ng-submit="init(username,password,country)">
    <label>Country</label><input type="text" ng-model="country"/><br/><br/>
    <label>UserName</label><input type="text" ng-model="username" /></br></br>
    <label>Password</label><input type="password" ng-model="password">
    </br>
    <button type="submit" >Login</button>
</form>

And controller form the corresponding js is:

app.controller('LoginController', ['$http', '$scope', function ($scope, $http) {
    $scope.login = function (credentials) {
    $http.get('http://mywebservice').success(function ( data ) {
        alert(data);
        });
    }
}]);

The web-service works fine when I hit it from URL bar. How to resolve the problem? Kindly help!

12条回答
疯言疯语
2楼-- · 2019-01-04 10:09

It is a problem on the server side. You have to add your client address to your server exposed API. If you are using Spring frame work you can annotate @CrossOrgin from org.springframework.web.bind.annotation.CrossOrigin;

Eg : @CrossOrigin(origins = "http://localhost:8080")

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ら.Afraid
3楼-- · 2019-01-04 10:11

I got

No 'Access-Control-Allow-Origin' header is present

and the problem was with the URL I was providing. I was providing the URL without a route, e.g., https://misty-valley-1234.herokuapp.com/.

When I added a path it worked, e.g., https://misty-valley-1234.herokuapp.com/messages. With GET requests it worked either way but with POST responses it only worked with the added path.

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虎瘦雄心在
4楼-- · 2019-01-04 10:13

This is how it worked for me. For Windows users testing with Bracket and AngularJS

1) Go to your desktop

2) Right click on your desktop and look for "NEW" in the popup drop down dialog box and it will expand

3) Choose Shortcut

4) A dialog box will open

5) Click on Browse and look for Google Chrome.

6) Click Ok->Next->Finish and it will create the google shortcut on your desktop

7) Now Right Click on the Google Chrome icon you just created

8) Click properties

9) Enter this in the target path

"C:\Program Files\Google\Chrome\Application\chrome.exe" --args --disable-web-security

10) Save it

11) Double click on your newly created chrome shortcut and past your link in the address bar and it will work.

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做个烂人
5楼-- · 2019-01-04 10:14

I have a solution below and its works for me:

app.controller('LoginController', ['$http', '$scope', function ($scope, $http) {
$scope.login = function (credentials) {
$http({
        method: 'jsonp',
        url: 'http://mywebservice',
        params: {
            format: 'jsonp',
            callback: 'JSON_CALLBACK'
        }
    }).then(function (response) {
        alert(response.data);
    });
  }
}]);

in 'http://mywebservice' there must be need a callback parameter which return JSON_CALLBACK with data.
There is a sample example below which works perfect

$scope.url = "https://angularjs.org/greet.php";
    $http({
        method: 'jsonp',
        url: $scope.url,
        params: {
            format: 'jsonp',
            name: 'Super Hero',
            callback: 'JSON_CALLBACK'
        }
    }).then(function (response) {
        alert(response.data);
    });

example output:

{"name":"Super Hero","salutation":"Apa khabar","greeting":"Apa khabar Super Hero!"}
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贼婆χ
6楼-- · 2019-01-04 10:15

In my case, I was trying to hit a WebAPI service on localhost from inside an MVC app that used a lot of Angular code. My WebAPI service worked fine with Fiddler via http://localhost/myservice. Once I took a moment to configure the MVC app to use IIS instead of IIS Express (a part of Visual Studio), it worked fine, without adding any CORS-related configuration to either area.

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爷的心禁止访问
7楼-- · 2019-01-04 10:19

This is a CORS issue. There are some settings you can change in angular - these are the ones I typically set in the Angular .config method (not all are related to CORS):

$httpProvider.defaults.useXDomain = true;
$httpProvider.defaults.withCredentials = true;
delete $httpProvider.defaults.headers.common["X-Requested-With"];
$httpProvider.defaults.headers.common["Accept"] = "application/json";
$httpProvider.defaults.headers.common["Content-Type"] = "application/json";

You also need to configure your webservice - the details of this will depend on the server side language you are using. If you use a network monitoring tool you will see it sends an OPTIONS request initially. Your server needs to respond appropriately to allow the CORS request.

The reason it works in your brower is because it isn't make a cross-origin request - whereas your Angular code is.

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