Etag support in openbmc

[Ed Tanous]

We previously supported etag for static resources, hence the
references to them.  They were removed when I moved phosphor-webui to
webpack builds, and it was always on my list to add them back, using
webpacks hashing mechanisms, but I never got a chance.

In practice, they didn't provide that much utility because most browsers:
1. only cache if you have a valid SSL certificate.
2. Have a very limited cache size.
3. Don't support cross site etag caches.

So in practice, the cache didn't provide any benefit in a majority of cases.

In terms of supporting etags on non-static resources, that's quite
complex, given that cache invalidation is difficult, and likely
deserves its own design document.

-Ed

On Mon, Oct 11, 2021 at 8:04 PM Mohammed.Habeeb ISV
<mohammed.habeeb at inventec.com> wrote:
>
> Hi
>
> Do we have the Etag support in OpenBMC? I see there is a mention of ETag in
> bmcweb file redfish-core/src / error_messages.cpp, however not sure if Etag is supported.
> Please let me know.
>
> Regards