Thats what the "must-revalidate" means. It should work better with just max-age or Expires header - and with a longer value than 60 sec since this is supposed to be a *permanent* situation.
As I know "must-revalidate" mean "refuse to return stale responses to the user even if they say
that stale responses are acceptable" - cached object must be revalidated.
Max-age=60 was only used for testing.
The results of my testing:
- redirect 302 or 307 - to be cached needs Cache-Control max-age > 0 or Expires "access plus 1 seconds"
- redirect 301 - to be cached needs Cache-Control max-age > 60 or Expires "access plus 61 seconds"
- redirect 301 - to be cached needs Cache-Control max-age > 60 or Expires "access plus 61 seconds"
This is strange because I thought that 301 is always cached without Cache-Control or Expires headers. And I can't find any information in the documentation which describes such behaviour.
zigi
On Thu, Sep 21, 2017 at 11:11 AM, Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote:
On 21/09/17 20:36, kAja Ziegler wrote:
Hi Amos,
302 and 307 are not because as their status description indicates
they are *temporary* results. They can only be cached if there are
explicit details from the server indicating for how long.
You were right. After I added header Cache-Control "max-age=60, must-revalidate" to the redirects, then the response was cached. Thank you for clarification.
301 should be cached unless the object would need revalidation
immediately.
But for 301 I always get MISS - with and without a cache-control header:
$ curl -v http:/test.example.com/img301.jpg <http://test.example.com/img301.jpg >
GET /img301.jpg HTTP/1.1< HTTP/1.1 301 Moved Permanently
Host: test.example.com <http://test.example.com>
User-Agent: curl/7.50.1
Accept: */*
< Date: Thu, 21 Sep 2017 06:44:41 GMT
< Server: Apache
< Cache-Control: max-age=60, must-revalidate
< Location: http://test.example.com <http://test.example.com>/img.svg
< Content-Length: 247
< Content-Type: text/html; charset=iso-8859-1
< X-Cache: MISS from <squid-proxy>
< X-Cache-Lookup: MISS from <squid-proxy>:3128
I can't find any information on Squid wiki or via Google if the object need revalidation immediately.
Thats what the "must-revalidate" means. It should work better with just max-age or Expires header - and with a longer value than 60 sec since this is supposed to be a *permanent* situation.
Amos
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