No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin

Hi, my name is Joshua, I’m new with Ionic and Angular and I’m trying to develop a and Ionic app with a Rest api for the login, but, when I try to consume the api with the URL, I get some troubles and I would like to know if someone has faced with this situation before and knows a solution that I do not know.

The function to consume the api that I have, is this:

Where “credentials” are the parameters (email, password, remember_me), and “type” is an extension for the api´s url.

and… the ‘error’ I get when I try to run on my android device, is this…

an “Access-Control-Allow-Origin” error.
So… I would like to know if one of you knows something about this message and how to fix it.
Thank you in advance.

Aditional information: I tried to set a proxy in the ionic.config.json and It works on webbrowsers, but still doesn’t work on devices.

This situation basically happens when your request is not authorized by your rest API server(backend). This error is also known as CORS(Cross-origin resource sharing) error. You have to give permission from your rest API server. If you are using PHP as rest API server language the try this:

header("Access-Control-Allow-Origin: *"); // Allow all request Url eg. http://localhost:8080,, etc.
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS'); // Allow API methods

You can either put individual IPs or use ‘*’ as allow all requests.

If you are using any other language/framework as your rest API server then please let us know.

Also, according to your second image you are trying to hit the login API with two ‘/’.
try removing the extra ‘/’.

Let me know if these help.