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Usually, the web server that is serving a page includes the CSRF token inside the HTML. However when I'm using a cross-origin REST API, there is no "initial" page that could include the CSRF token.

My idea is to respond with a CSRF token after the user logs in, but I'm not entirely sure if this protects against a CSRF-attack?

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    The alternative is to expose a service that returns a CSRF token, which should be included in the next request. Being that web services typically use header-based authentication, I'm not sure if a CSRF token applies. Oct 29 at 12:24
  • There are two common solutions - csrf in the header with cors (if you control web servers which apis you call) or samesite cookie. Other scenarios may include defining additional domains. Oct 31 at 0:30
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What you are referring to is a stateless API request where you need to prevent CSRF on the initial caller request.

What you need here is a mechanism called a double-submit-cookie

But you have not made it clear which endpoint you control so I am unable to derive if this solution will work for you because in a stateless scenario there are limited options, and even less ability to implement security controls when you have no control over both endpoints.

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