Question

How can I set CORS headers for a static site?

Posted on January 24, 2024
DigitalOcean App Platform
Asked by Thomas Meerpohl

Hi, I’m having CORS issues. I have a backend running in digitalocean as an App and another App running the frontend as a static site. When I’m trying to access the backend from the frontend I get a CORS error. I tried setting my backend url in the app spec as follows:

ingress:
  rules:
  - component:
      name: guest-list-frontend
    cors:
      allow_origins:
      - prefix: https://my-backend-app.ondigitalocean.app
    match:
      path:
        prefix: /

Where the url mentioned in prefix is the URL of my backend. But I still get this issue. Can anybody help me out?

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Bobby Iliev

Site Moderator

• January 27, 2024

Hey!

To set CORS headers for your static site on DigitalOcean App Platform, you need to configure CORS policies for your app’s resources. Here’s a brief guide on how to do it:

Go to your DigitalOcean control panel at cloud.digitalocean.com/apps.
Click on your app, then select ‘Settings’.
Click on the resource (like your backend app) for which you want to edit CORS policies.
Under ‘HTTP Request Routes’, click ‘Edit’, then ‘Configure CORS’.
In the ‘Configure CORS’ window, you can add an origin and specify the match type (Exact, Prefix, or Regex).

This approach will help you set the Access-Control-Allow-Origin header based on the match type you select. Keep in mind that the ‘Exact’ match type will set the header only if the client’s origin exactly matches the value you provide, while ‘Prefix’ and ‘Regex’ offer more flexibility in matching the origin.

For more detailed instructions, you can refer to DigitalOcean’s documentation on configuring CORS policies.

Hope that this helps!

Best,

Bobby