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Add note about X-XSRF-TOKEN header #171

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Add note about X-XSRF-TOKEN header #171

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3 changes: 3 additions & 0 deletions docs/guide/csrf-protection.md
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Expand Up @@ -57,6 +57,9 @@ Axios automatically checks for the existence of an `XSRF-TOKEN` cookie. If it's

The easiest way to implement this is using server-side middleware. Simply include the `XSRF-TOKEN` cookie on each response, and then verify the token using the `X-XSRF-TOKEN` header sent in the requests from axios. (That's basically what `inertia_rails` does).

> [!NOTE]
> `X-XSRF-TOKEN` header only works for [Inertia requests](/guide/the-protocol#inertia-responses). If you want to send a normal request you can use `X-CSRF-TOKEN` instead.

## Handling mismatches

When a CSRF token mismatch occurs, Rails raises the `ActionController::InvalidAuthenticityToken` error. Since that isn't a valid Inertia response, the error is shown in a modal.
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