CORS (Cross-Origin Resource Sharing) is a mechanism that enables resources from different domains to be accessed securely. It is important because browsers usually restrict requests to the same domain as the requesting page. When handling AMP content in emails, adding the correct CORS headers to your API is crucial for security and compatibility.
To add CORS headers to your API, follow these steps:
1. Identify Your API Endpoint
Determine the endpoint of your API that serves the AMP content. You'll need to configure CORS headers specifically for this endpoint.
2. Configure CORS Headers
In your API server or configuration, set up the necessary CORS headers. Here are some commonly used headers:
Access-Control-Allow-Origin: Set this header to the origin(s) from which you expect AMP email requests. For example, if your emails are hosted on https://example.com, you should set Access-Control-Allow-Origin to https://example.com.
Access-Control-Allow-Methods: Specify the HTTP methods allowed for AMP email requests. Common methods include GET and POST.
For example, Access-Control-Allow-Methods: GET, POST.
Access-Control-Allow-Headers: Define the headers that are allowed in AMP email requests. This should include headers such as Content-Type and Authorization if applicable.
Access-Control-Allow-Credentials: If your API requires authentication and cookies, set this header to true. Otherwise, you can omit it.
HTTP/1.1 200 OK
Content-Type: application/json
Access-Control-Allow-Origin: https://example.com
Access-Control-Allow-Methods: GET, POST
Access-Control-Allow-Headers: Content-Type, Authorization
Access-Control-Allow-Credentials: true
3. Test Your CORS Configuration
After configuring the CORS headers, thoroughly test your API with AMP email requests to ensure that the headers are set correctly and that AMP content can be loaded securely.
