[jira] [Commented] (TS-886) Grace mode supported, very useful for slow origins

["James Peach (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13811719#comment-13811719 ] 

James Peach commented on TS-886:
--------------------------------

The RFC 5861 plugin is the recommended way to do this.

> Grace mode supported, very useful for slow origins
> --------------------------------------------------
>
>                 Key: TS-886
>                 URL: https://issues.apache.org/jira/browse/TS-886
>             Project: Traffic Server
>          Issue Type: New Feature
>          Components: Cache, Core, HTTP
>         Environment: N/A
>            Reporter: Ricky Chan
>            Priority: Minor
>              Labels: backgound, grace, stale
>             Fix For: sometime
>
>
> Varnish has long supported a mode called "grace mode" see https://www.varnish-cache.org/docs/trunk/tutorial/handling_misbehaving_servers.html.
> This is useful in cases where the origin server is slow at generating data, and you can configure it to serve stale content while a backend job is fetching the object.
> I would suggest this feature be enhanced to include support for.
>   * url regex match to apply grace to.
>   * override must-revalidate so that grace can be used (I know this violates the RFC, but a cache admin can optionally do this on a per origin/url basis).
> For example I have some origins which take between 5 to 20 seconds to generate content and this is handy in these known cases.



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