Cache question

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Cache question

Friscia, Michael

I’m working through use cases for cache in a presentation and had a thought jump into my head. We have a server block where most things are cached, but a few locations are set not to use the cache. But the thought is that even thought we don’t want to use a local cache and always fetch from upstream, is it possible to still keep a cache copy that could then be served if the upstream host sends anything other than a 200 response?

 

___________________________________________

Michael Friscia

Office of Communications

Yale School of Medicine

(203) 737-7932 - office

(203) 931-5381 - mobile

http://web.yale.edu

 


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Re: Cache question

Peter Booth
Sure is. Look at the stale-if-error stale-while-revalidate proxy_cache_use_stale proxy_cache_lock etc

Can you describe the use case a bit more? Why don't you want to cache this particular content?
Is it that its dynamic and a fresher version is always preferable but the stale is good enough in 
the event of an error? Or is there more to it than that? 

Sometimes people build sites that are “more dynamic” than they need to because they didn't 
consider a static site that gets frequently periodically regenerated.

Peter

On 28 Jun 2018, at 9:27 AM, Friscia, Michael <[hidden email]> wrote:

I’m working through use cases for cache in a presentation and had a thought jump into my head. We have a server block where most things are cached, but a few locations are set not to use the cache. But the thought is that even thought we don’t want to use a local cache and always fetch from upstream, is it possible to still keep a cache copy that could then be served if the upstream host sends anything other than a 200 response?
 
___________________________________________
Michael Friscia
Office of Communications
Yale School of Medicine
(203) 737-7932 - office
(203) 931-5381 - mobile
 
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nginx mailing list
[hidden email]
http://mailman.nginx.org/mailman/listinfo/nginx


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Re: Cache question

Friscia, Michael

Yes, the content is dynamic, basically a set of JSON RESTful applications we call feeds that for specific reasons we do not cache but most we do. The use-case is simple, if we have to release new code these feeds are down/returning a 503 error but if we had a cache that would serve stale during that time, then, in theory, our feeds would never go down.

 

As for the dynamic site thing, I completely agree. We have very dynamic content that we still cache. Much of our site is built using taxonomy driven feeds but even with our search box, the standard searches are all cached since we know the most common medical terminologies that will be queried. But for the things we can’t cache, it would be pretty bad.

 

Thanks for the commands to look at, this will be really helpful.

 

___________________________________________

Michael Friscia

Office of Communications

Yale School of Medicine

(203) 737-7932 - office

(203) 931-5381 - mobile

http://web.yale.edu

 

 

From: nginx <[hidden email]> on behalf of Peter Booth <[hidden email]>
Reply-To: "[hidden email]" <[hidden email]>
Date: Thursday, June 28, 2018 at 12:46 PM
To: Wiktor Kwapisiewicz via nginx <[hidden email]>
Subject: Re: Cache question

 

Sure is. Look at the stale-if-error stale-while-revalidate proxy_cache_use_stale proxy_cache_lock etc

 

Can you describe the use case a bit more? Why don't you want to cache this particular content?

Is it that its dynamic and a fresher version is always preferable but the stale is good enough in 

the event of an error? Or is there more to it than that? 

 

Sometimes people build sites that are “more dynamic” than they need to because they didn't 

consider a static site that gets frequently periodically regenerated.

 

Peter

 

On 28 Jun 2018, at 9:27 AM, Friscia, Michael <[hidden email]> wrote:

 

I’m working through use cases for cache in a presentation and had a thought jump into my head. We have a server block where most things are cached, but a few locations are set not to use the cache. But the thought is that even thought we don’t want to use a local cache and always fetch from upstream, is it possible to still keep a cache copy that could then be served if the upstream host sends anything other than a 200 response?

 

___________________________________________

Michael Friscia

Office of Communications

Yale School of Medicine

(203) 737-7932 - office

(203) 931-5381 - mobile

 

_______________________________________________
nginx mailing list
[hidden email]
http://mailman.nginx.org/mailman/listinfo/nginx

 


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[hidden email]
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