§8 IANA Considerations RFC 9111

The change controller for the following registrations is: "IETF ([email protected]) - Internet Engineering Task Force".

IANA has updated the "Hypertext Transfer Protocol (HTTP) Field Name Registry" at , as described in HTTP, with the field names listed in the table below:

Field Name  |  Status  |  Section  |  Comments
Age  |  permanent  |  5.1  |  
Cache-Control  |  permanent  |  5.2  |  
Expires  |  permanent  |  5.3  |  
Pragma  |  deprecated  |  5.4  |  
Warning  |  obsoleted  |  5.5  |  

IANA has updated the "Hypertext Transfer Protocol (HTTP) Cache Directive Registry" at with the registration procedure per Section 5.2.4 and the cache directive names summarized in the table below.

Cache Directive  |  Section
max-age  |  5.2.1.1, 5.2.2.1
max-stale  |  5.2.1.2
min-fresh  |  5.2.1.3
must-revalidate  |  5.2.2.2
must-understand  |  5.2.2.3
no-cache  |  5.2.1.4, 5.2.2.4
no-store  |  5.2.1.5, 5.2.2.5
no-transform  |  5.2.1.6, 5.2.2.6
only-if-cached  |  5.2.1.7
private  |  5.2.2.7
proxy-revalidate  |  5.2.2.8
public  |  5.2.2.9
s-maxage  |  5.2.2.10

IANA has added the following note to the "Hypertext Transfer Protocol (HTTP) Warn Codes" registry at stating that "Warning" has been obsoleted:

The Warning header field (and the warn codes that it uses) has been obsoleted for HTTP per [RFC9111].