javascript - Handling CORS Issues in Ionic

Question

I am creating an API with our API server script and am trying to communicate with the API on the IONIC framework application. I am working but it keeps on bringing up the cross-origin blocked error:

Answer 1

When developing locally using ionic serve or ionic run/emulate -l -c with livereload enabled, ionic creates a local dev server at port 8100 by default (http://localhost:8100/ ). The origin in this case is localhost:8100 , which when you contact an external service via HTTP with CORS enabled, they deem the request not trustworthy and therefor reject it.

As suggested by Ionic themselves (http://blog.ionic.io/handling-cors-issues-in-ionic/) , you can create a proxy alias within the Ionic app to route the API calls via, avoiding the origin issue altogether, however, their guide was specific for Ionic 1, so here is an update for Ionic v2.

Creating a Proxy in Ionic v2

Open ionic.config.json and add in the following proxies setup.

{
  "name": "project-name",
  "app_id": "xyz-projectid",
  "v2": true,
  "typescript": true,
  "proxies": [{
    "path": "/api",
    "proxyUrl": "https://the-real-api-host.com"
  }]
}

In this instance, we are creating a path within the ionic app at /api ,which will forward requests to the endpoint https://the-real-api-host.com . If you wanted to use a different api endpoint, for example http://my-custom-api.com/api/v2/ , you could insert it into proxyUrl instead.

Updating References to API Endpoint

In your app code, you now need to update all the references of the base URL for the API endpoint at https://the-real-api-host.com with /api . A call to /api should be detected when in Ionic serve, and proxied to the real address.

Each projects implementation may vary. In my case, I did not have control of the API, as it was an external service, so I could not control the CORS handling/responses myself.

Note: remember to restart the server (ionic serve) or you will get 404's from your API call because it will not yet be proxying.