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You are here: Home » HP Cloud CDN & DNS : Far Set Expires to Leverage Caching

By Abhishek Ghosh June 21, 2015 1:06 am Updated on June 21, 2015

HP Cloud CDN & DNS : Far Set Expires to Leverage Caching

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50 Years Expires May Not Work. Far Set Expires to Leverage Caching in HP Cloud CDN & DNS By Setting Container TTL to 5 Years & Same For DNS. Programmatically we can change the Expire Headers in OpenStack Object Storage or Swift on HP Cloud. Thats great, but actually setting the container TTL to a higher values do the same work for only setting the expire headers.

 

HP Cloud CDN & DNS : What Are the Pitfalls in Far Set Expires to Leverage Caching

 

50 years or 1577836800 seconds possibly can not write the data on Akamai’s container. Using 5 years value (157783680 seconds) works fine. Second unfortunate thing is that – the HTTPS links will not get the Expire Header changed. For example, this is a working example :

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$ curl -I http://h3c328c03da76f5c1e44c912c7d12561b.cdn.hpcloudsvc.com/usr/.htaccess
HTTP/1.1 200 OK
Last-Modified: Fri, 23 Jan 2015 19:27:36 GMT
ETag: "c863a49e68d1332f918c74e6675adba7"
Content-Length: 83
Accept-Ranges: bytes
Content-Type: application/octet-stream
X-Trans-Id: tx5e6e226ac9254d9294ef8-0055860573
Cache-Control: public, max-age=157782823
Expires: Sat, 20 Jun 2020 05:17:39 GMT
Date: Sun, 21 Jun 2015 00:43:56 GMT
Connection: keep-alive

But for the corresponding HTTPS URL :

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$ curl -I https://a248.e.akamai.net/cdn.hpcloudsvc.com/h3c328c03da76f5c1e44c912c7d12561b/prodaw2//usr/.htaccess
HTTP/1.1 200 OK
Last-Modified: Fri, 23 Jan 2015 19:27:36 GMT
ETag: "c863a49e68d1332f918c74e6675adba7"
Content-Length: 83
Accept-Ranges: bytes
Content-Type: application/octet-stream
X-Trans-Id: tx32b504b3a42f4256bb74c-0055860553
Cache-Control: public, max-age=42206
Expires: Sun, 21 Jun 2015 12:29:07 GMT
Date: Sun, 21 Jun 2015 00:45:41 GMT
Connection: keep-alive

Cache-Control: public, max-age=42206 – too low and has no fix discovered by us.

 

HP Cloud CDN & DNS : How To Far Set Expires to Leverage Caching

 

Very easy. Login to HP Cloud Horizon Web GUI. If you have any published container as CDN, click the down arrow button beside the name of the container :

HP Cloud CDN & DNS - Far Set Expires to Leverage Caching

Click to Edit the TTL and you will get a pop up window. Editing the TTL to 5 years (i.e. 157783680 seconds) will do the work for all the non-HTTPS URLs against the objects in the container. However, the HTTPS URLs will lag behind!

We guess, the TTL of A record and AAAA record should maximum raised to 157783680 seconds. 50 years probably triggers some errors in Akamai’s end – 50 years is officially supported max time by Akamai. You’ll get TTL of a domain in this way :

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dig +nocmd +multiline +noall +answer any thecustomizewindows.com

You have to Edit from DNS’s Web GUI. Geographical Distribution of HP Cloud – Akamai ‘s DNS system & Authority Servers are very complex and not possible for us to modify the value to huge extent. This command will give you better idea :

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dig +trace +nocmd +noall +answer +ttlid a thecustomizewindows.com

Change thecustomizewindows.com with your domain name.

Tagged With cdn dns caching

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "HP Cloud CDN & DNS : Far Set Expires to Leverage Caching," in The Customize Windows, June 21, 2015, February 1, 2023, https://thecustomizewindows.com/2015/06/hp-cloud-cdn-dns-far-set-expires-to-leverage-caching/.

Source:The Customize Windows, JiMA.in

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