I am trying to intercept a png image request and check part of its request. For instance, the GET request data:image/png;base64,ASDFASDGHTRADBT#$%GDFWSDFDAAAAAAAAA, I wan't to check that there are more than 5 A's. So far I have tried this but it can't intercept the request. Can anyone help with this?

cy.intercept('data:image/png').as('img')

cy.wait('@img').its('request.url').should('contain','AAAAA')