Ways to Implement an Origin's First-Party Cookies While Using it as a Third-Party

Imagine I am the owner of a website called "treat1creator.com". I want my clients, who are also website owners, to send HTTP requests to my server that contain cookies I have generated. Here is how it works:

  1. User "Sally" visits my site at treat1creator.com
  2. I (treat1creator.com) provide her with a cookie that her browser saves
  3. Sally then goes to another website called "recipe-fun.com"
  4. When Sally clicks a button on recipe-fun.com, her browser sends an HTTP request to treat1creator.com.

Is there a way for me to include the cookie created in step 2 in the request sent in step 4?

(Assuming I have full control over both websites)

javascripthttpcookiescross-domainthird-party-cookies

Answer №1

When making HTTP requests, cookies are always sent to the requested URL. The website that is requesting it (yummy-treats.com) must include the following header in its response:

Access-Control-Allow-Origin: <origin> //The website requester

If this header is missing, an error will occur like the one below:

Access to fetch at '<requested site>' from origin '<your site>' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

To resolve this issue, the requested site's response headers (bakerystore.com) need to include the origin (yummy-treats.com):

Access-Control-Allow-Origin: https://yummy-treats.com

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