You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@trafficserver.apache.org by "Miles Libbey (JIRA)" <ji...@apache.org> on 2010/04/19 21:27:49 UTC
[jira] Created: (TS-303) plugin idea: - a config option to
transform a 'no-cache' directive into a validation 'if-modified-since'
request
plugin idea: - a config option to transform a 'no-cache' directive into a validation 'if-modified-since' request
----------------------------------------------------------------------------------------------------------------
Key: TS-303
URL: https://issues.apache.org/jira/browse/TS-303
Project: Traffic Server
Issue Type: Improvement
Reporter: Miles Libbey
Priority: Minor
(moved from yahoo bug 633221)
Original description
by John Allspaw 4 years ago at 2006-04-17 11:04
This does disobey some of the HTTP specification, but it is a great performance
win when you're totally sure that something hasn't/can't be changed.
Squid has this, and this is ideally how it goes:
"When set, this option would make TrafficServer transform a request with a
no-cache directive into a validation (If-Modified-Since) request. In other
words, TrafficServer ads an "If-Modified-Since" header to the request before
forwarding it on. Note that this would only work for objects that have a
Last-Modified timestamp."
Comment 1
by Mark Nottingham 4 years ago at 2006-04-17 13:14:30
They other thing you could (optionally, depending on config?) do is to ignore cache-control request
headers all together. If you're confident of the cache's correctness, this doesn't allow the browser to force
a round trip back to your origin server (which could be an attack vector).
It really doesn't break HTTP if you're acting as a gateway; they're allowed to do pretty much what they
want.
Comment 2
by John Allspaw 4 years ago at 2006-04-17 13:20:33
Mark: yeah, TS does already have the option to completely ignore cache-control
headers, confirmed by Leif. I've generally thought that having the transform
into IMS just adds a slight amount of flexibility than the baby/bathwater if
totally ignoring. :)
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.