cy.intercept with response generates cross-origin error

[tpodom]

I have a login link that links to /login. If I intercept /login using cy.intercept('/login', { statusCode: 200, body: 'Login page' }) with a response body, I get a cross-origin error. If I use cy.intercept('/login') it works fine but I'm not understanding why the first one fails.

Cypress detected a cross origin error happened on page load:

  > Blocked a frame with origin "https://localhost:3500" from accessing a cross-origin frame.

Before the page load, you were bound to the origin policy:

  > https://localhost:3500

A cross origin error happens when your application navigates to a new URL which does not match the origin policy above.