Setting Cookies and Headers to either authenticate to your Sites or control the test environment has been in Calibre for some time (set via either the Test Agent or Test Profiles). Now, you can specify those settings while using Pull Request Reviews too:

version: 2
pullRequestReviews:
  # Headers
  - headers:
      - name: X-Calibre-Test
        value: Pull Request
      - name: User-Agent
        value: Calibre

  # Cookies
  - cookies:
      - name: seen-cookie-notice
        value: true
      - name: uid
        value: 1
        domain: calibreapp.com
        path: /
        secure: true
        httpOnly: true

This is especially useful if you’d like to set cookies and headers only for Pull Request Reviews tests (not inherited from Test Profiles settings). For example, you could set a header to signify that the test is for a Pull Request and should be safely routed to the staging infrastructure.