##### 3.2.2.4.18 Agreed-Upon Change to Website v2
Confirming the Applicant's control over the FQDN by verifying that the Request Token or Random Value is contained in the contents of a file.
1. The entire Request Token or Random Value MUST NOT appear in the request used to retrieve the file, and
2. the CA MUST receive a successful HTTP response from the request (meaning a 2xx HTTP status code must be received).
The file containing the Request Token or Random Number:
1. MUST be located on the Authorization Domain Name, and
2. MUST be located under the "/.well-known/pki-validation" directory, and
3. MUST be retrieved via either the "http" or "https" scheme, and
4. MUST be accessed over an Authorized Port.
If the CA follows redirects, the following apply:
1. Redirects MUST be initiated at the HTTP protocol layer.
a. For validations performed on or after July 1, 2021, redirects MUST be the result of a 301, 302, or 307 HTTP status code response, as defined in [RFC 7231, Section 6.4](https://tools.ietf.org/html/rfc7231#section-6.4), or a 308 HTTP status code response, as defined in [RFC 7538, Section 3](https://tools.ietf.org/html/rfc7538#section-3). Redirects MUST be to the final value of the Location HTTP response header, as defined in [RFC 7231, Section 7.1.2](https://tools.ietf.org/html/rfc7231#section-7.1.2).
b. For validations performed prior to July 1, 2021, redirects MUST be the result of an HTTP status code result within the 3xx Redirection class of status codes, as defined in [RFC 7231, Section 6.4](https://tools.ietf.org/html/rfc7231#section-6.4). CAs SHOULD limit the accepted status codes and resource URLs to those defined within 1.a.
2. Redirects MUST be to resource URLs with either the "http" or "https" scheme.
3. Redirects MUST be to resource URLs accessed via Authorized Ports.
If a Random Value is used, then:
1. The CA MUST provide a Random Value unique to the certificate request.
2. The Random Value MUST remain valid for use in a confirming response for no more than 30 days from its creation. The CPS MAY specify a shorter validity period for Random Values, in which case the CA MUST follow its CPS.
**Note**:
* The CA MUST NOT issue Certificates for other FQDNs that end with all the labels of the validated FQDN unless the CA performs a separate validation for that FQDN using an authorized method. This method is NOT suitable for validating Wildcard Domain Names.