Feature Request: HTTP serve validation results with Last-Modified header field

[reschke]

I'm currently running tests with various validators, GETting JSON output and post-processing it. It would be very useful if the JSON output would be served with a Last-Modified header field, indicating the time when the last validation run finished.

(see also cloudflare/cfrpki#83)

[partim]

That sounds like a good idea, indeed! We will try and implement it in 0.9.

We should also support If-Modified-Since and ETags.

[reschke]

...and If-None-Match, if you provide Etags...

[reschke]

Note: Rust newbie.

The code that serves the ROAs is easy to find. However, despite reading a lot, I couldn't quite figure out the "right" way to format a timestamp as an HTTP date. Is this functionality present in the libraries Routinator uses already?

[partim]

Yes, most date and time handling is done using the chrono crate. I believe DateTime::to_rfc2822 should provide the right format?

[reschke]

Unfortunately no; see https://greenbytes.de/tech/webdav/rfc7231.html#preferred.date.format. So it seems we'll need to come up with the correct format string for that...

[partim]

Shouldn’t be too difficult. However, I would prefer using an array of formatting items rather than a string since the latter needs to be parsed. We’re already using this strategy to generate the timestamp in the csvext format in output.rs.

[reschke]

Ah, more pointers! Appreciated. I'll give it a try soonish.

[partim]

I’d like to keep the issue open for support of ETags, If-Modified-Since, and If-None-Match.

(Client-side suppor for ETags in RRDP is supposed to be added for 0.9 as well, so this can all be ein aufwasch.)