Verify redirect behavior
When using redirects in your HTTP Practical Demonstration DCV process, redirects must begin with the domain being validated and include the same base domain.
Redirects must also meet the following requirements per the TLS baseline requirements:
Occurs at the HTTP protocol layer
Results from a 301, 302, or 307 HTTP status code response
Uses resource URLs with the HTTP or HTTPS scheme
Uses resource URLs accessed through authorized ports
Improper redirect configuration prevents DigiCert from retrieving the validation file.