Support caching with Etags

[timurvafin]

No description provided.

[VladimirMikhailov]

AFAIK, Rails provides caching with etag by default:

• Rack::ETag

and from http://guides.rubyonrails.org/caching_with_rails.html from 3 Conditional GET support:

Instead of an options hash, you can also simply pass in a model, Rails will use the updated_at and cache_key methods for setting last_modified and etag:

curl "http://localhost:5000/v1/posts.json" -X GET -v

< HTTP/1.1 200 OK
< X-Frame-Options: SAMEORIGIN
< X-XSS-Protection: 1; mode=block
< X-Content-Type-Options: nosniff
< X-UA-Compatible: chrome=1
< Content-Type: application/json; charset=utf-8
< ETag: "7b164b7b93707001116f3c29addb7922"
< Cache-Control: max-age=0, private, must-revalidaten

[timurvafin]

@VladimirMikhailov we need to lear how to use stale? and fresh_when.

• single resource: resource.updated_at
• collection of resources: collection.max(:updated_at)

[maratnasyrov]

Probably we could backport solution from DS cc @antongudkov @nickolayabdrafikov

[daniilsunyaev]

@timurvafin could you please describe what is an issue here?