7. IANA Considerations
7.1. Status Code Registration
The "Hypertext Transfer Protocol (HTTP) Status Code Registry" located at http://www.iana.org/assignments/http-status-codes has been updated with the registration below:
| Value | Description | Reference |
|---|---|---|
| 304 | Not Modified | Section 4.1 |
| 412 | Precondition Failed | Section 4.2 |
7.2. Header Field Registration
HTTP header fields are registered within the "Message Headers" registry maintained at http://www.iana.org/assignments/message-headers/.
This document defines the following HTTP header fields, so the "Permanent Message Header Field Names" registry has been updated accordingly:
| Header Field Name | Protocol | Status | Reference |
|---|---|---|---|
| ETag | http | standard | Section 2.3 |
| If-Match | http | standard | Section 3.1 |
| If-Modified-Since | http | standard | Section 3.3 |
| If-None-Match | http | standard | Section 3.2 |
| If-Unmodified-Since | http | standard | Section 3.4 |
| Last-Modified | http | standard | Section 2.2 |
The change controller is: "IETF ([email protected]) - Internet Engineering Task Force".