What are the standard headers in NNTP?

Question

After looking at the NNTP standard, I have figured out how to extract a header from the message, how to fold headers, and how to separate the header label from the header text. What I can't find is an official list of standard NNTP headers. The standard lists Subject, From, Date, Message-id, Reference but not Groups which I know needs to be there.

Is there an official list of all the official NNTP headers? For bonus marks, is there a list of commonly-used, unofficial headers?

EDIT

I found the list of standard headers. Is there a similar list of non-standard, but common, headers?

Although I am using Java, the protocol standard is completely language-agnostic. — Kevin Lacquement, Aug 13 '12 at 04:29
I'd be glad to share notes. if you just want an Enumeration of Header's, that's easy [enough](http://www.gnu.org/software/classpathx/javamail/javadoc/gnu/mail/providers/nntp/NNTPMessage.html#getAllHeaders%28%29). Are you after the headers for a specific article? All articles in a newsgroup? Just asking in general? If only for my edification, I'd be interested in some code and seeing what you're specifically after. — Thufir, Aug 13 '12 at 04:34
I think you're after this: Newsgroups: gwene.com.economist however, be aware that it can be Newsgroups: gwene.com.economist,groupx,group_y,etc,etc. — Thufir, Aug 13 '12 at 04:37

score 4 · Accepted Answer · edited Oct 07 '21 at 05:57

You are not looking at the correct RFC the one you link to is the general message format.

Netnews is explicitly addressed in the Netnews Article Format RFC 5536 which lists the headers (with the page numbers of the RFC where they are defined) as

      3.1. Mandatory Header Fields ...................................10
           3.1.1. Date ...............................................11
           3.1.2. From ...............................................11
           3.1.3. Message-ID .........................................11
           3.1.4. Newsgroups .........................................13
           3.1.5. Path ...............................................14
           3.1.6. Subject ............................................16
      3.2. Optional Header Fields ....................................16
           3.2.1. Approved ...........................................17
           3.2.2. Archive ............................................17
           3.2.3. Control ............................................17
           3.2.4. Distribution .......................................18
           3.2.5. Expires ............................................19
           3.2.6. Followup-To ........................................19
           3.2.7. Injection-Date .....................................20
           3.2.8. Injection-Info .....................................20
           3.2.9. Organization .......................................22
           3.2.10. References ........................................22
           3.2.11. Summary ...........................................23
           3.2.12. Supersedes ........................................23
           3.2.13. User-Agent ........................................23
           3.2.14. Xref ..............................................24
      3.3. Obsolete Header Fields ....................................25
           3.3.1. Lines ..............................................25

What are the standard headers in NNTP?

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