Since the server is sending a fresh request to your destination, there will be no origin and therefore, no CORS needed. The Ionic CLI introduced the ability to have a proxy server issue requests for you to get around any CORS issues you may have. Will take our requests, issue a new request to the API endpoint, receive the response, and forward it back to our app so we can get around CORS issues. What we’d need to do to get around these CORS issues is have a proxy server that In computer networks, a proxy server is a server (a computer system or an application) that acts as an intermediary for requests from clients seeking resources from other servers. Let’s look how the Ionic CLI providesĪn easily configurable proxy server. What we need, then, is a request that does not specify an origin. However, we can’t always control the endpoint we are accessing. There are two ways to solve the issue: The first, and easier, solution is to just allow all origins from your API endpoint. Dealing with CORS in IonicĬORS is only an issue when we are running or testing our app when running ionic serve or ionic run -l. The app runs, thus firing a browser on the phone/simulator to run the files from the server (or whatever your local IP address is).Īny AJAX request sent out to a host other than 192.168.1.1:8100 will require a CORS preflight request to see if it can access the resource.The app runs, thus firing a browser on the phone/simulator to run the files that were copied over, something like: file://some/path/Your origin will not exist, since you are running off of a file:// URI therefore, any request outwards will not require a CORS request.Your files for the app are copied to the device (or simulator).This starts you off looking at your app loaded in a browser on your computer with the address (if you chose localhost).Īny AJAX request sent out to a host other than localhost:8100 will have localhost:8100 as its origin and thus will require a CORS preflight request to see if it can access the resource. Your browser is opened to point at the local server address.Let’s take a look what your origin will be when you’re running your app via ionic serve, ionic run, or ionic run -l. If we get the error above, then we may not access the resource from the server. Since does not match the host of api.com, our request from must ask the server for approval before we can access the resource, in the form of an HTTP OPTIONS request header. Say we send an AJAX request to, your host origin will be specified by the Origin header that is automatically included for CORS requests by the browser. The origin is the host you are currently viewing. So what is CORS, and why is it a problem? Origin ' is therefore not allowed access. No 'Access-Control-Allow-Origin' header is present on the requested resource. They usually look something like this: XMLHttpRequest cannot load. If you’ve used ionic serve or ionic run with live reload and accessing external API endpoints, chances are you’ve run into some CORS
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