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https://issues.apache.org/jira/browse/TS-1463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13454699#comment-13454699
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Kit Chan commented on TS-1463:
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So the base problem is that once the async call established a connection with
the origin server and is ready to receive data from it, the stale copy/resource
is no longer available and subsequent requests will result in a TCP_MISS and an
extra call to the origin server
So here are some of my thoughts/options. Not very well organized and are open
for discussions
1) I think it is highly unlikely. It seems each cache key can have only one
value. So if each cache key can have 2 value, then we can keep one for stale
copy while the one is active fresh. But then of course memory consumption will
increase.
2) If the url is "http://www.example.com/";, the async call can be made for
"http://www.example.com/?_swr=1";. This will result in the async call using a
separate cache key. Once the async call is done, we need another way to change
the value of the original cache key. (We can change the value of original cache
key by POSTing the result to the original cache key url and use
TSHttpTxnIntercept() to intercept this request and stop it from reaching origin
server. The intercept code will then return with a normal cacheable response
and result in changing the value of the cache key. Is there a simpler way than
this?)
> rfc5861 plugin does not return stale data upon subsequent requests
> ------------------------------------------------------------------
>
> Key: TS-1463
> URL: https://issues.apache.org/jira/browse/TS-1463
> Project: Traffic Server
> Issue Type: Bug
> Reporter: Phil Sorber
> Assignee: Phil Sorber
>
> Upon subsequent requests the cache returns MISS instead of STALE so the
> plugin isn't able to return the stale response properly.
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