Test field:  

--------
Frame: 'cross-site-frame'
--------
This page was requested with the HTTP method POST.

Parameters:

test-field = test-value

Http headers:

HTTP_CACHE_CONTROL = max-age=0
HTTP_CONNECTION = keep-alive
HTTP_HOST = localhost:8080
HTTP_ORIGIN = null
HTTP_SEC_CH_UA = "content_shell";v="999"
HTTP_SEC_CH_UA_MOBILE = ?0
HTTP_SEC_CH_UA_PLATFORM = "Unknown"
HTTP_SEC_FETCH_DEST = iframe
HTTP_SEC_FETCH_MODE = navigate
HTTP_SEC_FETCH_SITE = cross-site
HTTP_SEC_FETCH_STORAGE_ACCESS = active
HTTP_UPGRADE_INSECURE_REQUESTS = 1