IONIC 3 CORS Issue while opening in device and using api

access-control-allow-origin ionic 4
access-control-allow-origin ionic 3 android
ionic 5 cors issue
ionic origin http://localhost:8080 is not allowed by access-control-allow-origin.
cors error localhost
ionic.project file location
ionic://localhost

I am beginner in IONIC, I am using slim rest api with ionic 3. I am getting this error:

"Failed to load http://sargam.digifrizz.com/api/v1/empLogin: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8100' is therefore not allowed access."

I am also using proxies URL.

 {
      "name": "sargam",
      "integrations": {
        "cordova": {}
      },
      "type": "ionic-angular",
       "proxies": [
        {
          "path": "/v1/empLogin",
          "proxyUrl": "http://sargam.digifrizz.com/api/v1/empLogin"
        }
      ]
    }

I am using this code:

  return new Promise((resolve, reject) => {
                let headers = new Headers();

                headers.append('Access-Control-Allow-Origin' , '*');
                        headers.append('Access-Control-Allow-Headers','Origin, Content-Type, X-Auth-Token, authorization, X-Requested-With');           
                headers.append('Access-Control-Allow-Methods', 'POST, GET, OPTIONS, PUT');
                headers.append('Access-Control-Allow-Credentials', 'true');
                headers.append('Accept','application/json');
                        headers.append('Content-Type', 'application/json');


            this.http.post(apiUrl+'empLogin', JSON.stringify(credentials), {headers: headers})
              .subscribe(res => {
                resolve(res.json());

              }, (err) => {
                reject(err);
              });
            });

Please help me in solving this issue

Thanks Snigdha

CORS access control must be implemented on server side. You should respond with 200 OK to an OPTIONS request and include these headers with proper configuration: Access-Control-Allow-Origin, Access-Control-Allow-Headers and Access-Control-Allow-Methods. You should read CORS documentation to how to implement it in the backend.

Handling CORS issues in Ionic, Your browser is opened to point at the local server address. Your files for the app are copied to the device (or simulator). CORS is only an issue when we are running or testing our app when We will also set up an Angular Service to use that API Endpoint to get data. February 3, 2016 at 11:58 am. CORS Errors in Ionic Apps What is CORS? Cross-Origin Resource Sharing (CORS) is a mechanism that browsers and webviews — like the ones powering Capacitor and Cordova — use to restrict HTTP and HTTPS requests made from scripts to resources in a different origin for security reasons, mainly to protect your user's data and prevent attacks that

Add cors plugin to your chrome browser it will work for now. But you have handle cors on server side.

CORS Errors, CORS errors are common in web apps when a cross-origin request is made but to a 3rd-party API, first check in its documentation that is safe to use it of the app must always be done in a device or simulator going forward. CORS stands for Cross-Origin Resource Sharing and it is a security protocol implemented by browsers that allow a server to determine what domains/origins should be allowed access to its resources. Since an Ionic application runs inside of a browser, CORS will apply to requests that are launched from within an Ionic application.

I am using "Access-Control-Allow-Origin, Access-Control-Allow-Headers and Access-Control-Allow-Methods" backend but geting same error

Backend response is

access-control-allow-headers →X-Requested-With, Content-Type, Accept, Origin, Authorization access-control-allow-methods →GET,PUT,POST,DELETE,OPTIONS access-control-allow-origin →* cache-control →no-store, no-cache, must-revalidate connection →close content-length →412 content-type →application/json;charset=utf-8 date →Fri, 21 Dec 2018 08:06:22 GMT expires →Thu, 19 Nov 1981 08:52:00 GMT pragma →no-cache server →Apache/2.2.15 x-powered-by →PHP/7.0.27

IONIC 3 CORS Issue while opening in device and using api, CORS Errors, CORS errors are common in web apps when a cross-origin request is made but to a 3rd-party API, first check in its documentation that is safe to use it of the app must always be done in a device or simulator going forward. We've now identified a major issue that we need to fix, so that's great. We did test HTTP and didn't have any issues, but it must have been with the way our server was configured. We are all swamped right now getting Ionic V2 ready to go. Hopefully, the plugin will be ready for prime time to correspond with Ionic V2 RC.

CORS Issue With Ionic Apps [Solved], If you code with Ionic or Cordova and use a REST API, you probably have seen an error like Ionic's blog has an old post on CORS issues. Handling CORS issues in Ionic. to handle the CORS problem is to ultimately ask your API provider to allow all hosts. an issue while running the application on

A Practical solution for CORS (Cross-Origin Resource Sharing , i have a problem with CORS when i install built apk on my actual device. when i run app on emulator or with ionic serve or even with ionic run it works fine. after installing ZuraM opened this issue on Oct 10, 2017 · 2 comments local packages: @ionic/app-scripts : 3.0.0 Cordova Platforms : android 6.2.3 Ionic Framework  Ionic’s blog has an old post on CORS issues. Unfortunately, the solution that they provide is only suitable when you are running the app using ionic serve or ionic run -l. Unfortunately, the solution that they provide is only suitable when you are running the app using ionic serve or ionic run -l.

CORS error on Device · Issue #13094 · ionic-team/ionic · GitHub, Dealing with CORS (Cross-Origin Resource Sharing) in Ionic Applications This is an issue I've seen popping up on forums more and more frequently on a device, then the origin would also be localhost because Ionic spins 3. Downgrade to UIWebView (not recommended). The reason a lot of people  When I am using api via CURL -i, it's Right. But the angularjs shows CORS problem.