The AngularJS Cross-Origin Resource Sharing (CORS) Policy

Our team is currently working on a web application using AngularJS that requires calling REST API services from another application. However, due to it being a cross domain request, we are facing difficulties in making the calls and receiving the following error message (en.wikipedia.org/wiki/Same-origin_policy))

The error message states: "XMLHttpRequest cannot load . No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access. The response had HTTP status code 400."

In our implementation, we are utilizing an angular service within our typescript module (docs.angularjs.org/api/ng/service/$http) as shown below:

////////

 static $inject = ["$http"];

constructor(private $http: ng.IHttpService) {}

public testApi(): ng.IPromise<any> {

    var baseUrl = "http://appserver:9090";
    var data  = {requestData};
    var response = this.$http.post(url+"/checkAndUpdate", data);
    
    return response;
}

/////

We would greatly appreciate any guidance on the best approach to resolving this issue using AngularJS. If there are any existing solutions available, please point us in the right direction.

Thank you.

Answer №1

It's important to note that the issue is not originating from AngularJS. Rather, it seems to stem from the headers within the API server's response.

In order for this communication to work smoothly, the CORS settings on the API server need to be properly configured. Are you able to manage these settings on the API server?

Answer №2

It appears to be a CORS problem.

If the request uses the GET method, you can utilize jsonp to resolve it. Keep in mind that jsonp only works with GET requests. If not, there are several other methods available to address this issue. One option is using Windows.PostMessage, although it may not be compatible with all browsers. The recommended approach would be to employ reverseProxy from your main domain and then proxy pass it to the sub-domain.

There are numerous solutions for handling CORS problems. A simple search on Google will provide various options.

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