2016-08-25 18:52 GMT+03:00 Alex Rousskov <[email protected]>:
> 3. Sending an HTCP message to another service.
>
> > - hdr.putTime(Http::HdrType::LAST_MODIFIED, e->lastmod);
> > + if (e && e->lastModified() > -1)
> > + hdr.putTime(Http::HdrType::LAST_MODIFIED,
e->lastModified());
>
> Is this a conditional/revalidation request? If yes, then should we use
> an effective modification time instead, like we do in use case #1?
I have not found what is the "conditional/revalidation" request from
HTCP point
of view. The code snippet is taken from htcpTstReply(), serving replies
for TST
requests (TST - test for the presence in the cache). If the entry is cached,
this method fills HTCP reply packet with some of cached entry's headers
(Age,
Expires, Last-Modified etc.). According to the documentation, these
headers are
added in order to give client an ability to calculate object's freshness
itself:
HTCP response does not provide such information explicitly. On the other
hand, I
have not found any strict requirements of what HTTP headers HTCP reply
should
contain.
Would the "effective" Last-Modified information help HTCP client to
calculate
object's freshness? It looks that some more information in this case is
better
that lack of it.
Eduard.
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