The HTTP Idempotency request header field can be used to signal to a URI-identified resource that the client expects the operation invoked to be idempotent with provided key.
The latest published draft can always be found on the IETF site.
If the draft you want to make a comment on specifies an e-mail list for feedback, please use this address. Usually, it's in the abstract.
Otherwise, feel free to open an issue on GitHub.
If you want to submit a pull request against the draft, modify draft.md only. We use kramdown-rfc2629 to verify the content and generate markdown, plain text, and XML versions.
kramdown-rfc2629 draft.md
or
kdrfc draft.md
Then use xml2rfc to generate .html, .pdf, etc. to see results of your work.
xml2rfc draft.xml —html