CDN Purge Cache
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VNG CorporationCDN Purge Cache is used in cases where it is necessary to refresh or delete cached content on the CDN system.
Here is a detailed description of the steps to perform Purge Cache on CDN:
Step 1: First, you have initialized an Object Download on the vCDN system. For detailed steps, please refer here Suppose, below I have initialized an Object Download tuongtk3-download (vCDN Domain: tuleemu0l7obj.vcdn. cloud ) and linked it to S3 Origin. On S3 Origin, I have created files demo1.txt ... demo5.txt, text1.txt ... text5.txt.
Step 2: Perform the Purge Cache By (ALL, BEGIN, END, CONTAIN, URI(s) ) test. In which:
ALL : Clear all cache.
BEGIN : Clear cache for URLs starting with a certain string.
END : Clear cache for URLs ending with a certain string.
CONTAINS : Clear cache for URLs containing a specific string.
URI(s) : Clear the cache for one or more specific URIs.
Step 3: Call the links for CDN to cache
With vCDN Domain: tuleemu0l7obj.vcdn. cloud , you can make calls to the links for CDN to cache as follows:
....
When CDN has cached we will see the header X-Cache: HIT and X-Cache-Version: $Thời_gian_timestamp_lưu_cachein CDN
For files that are not cached in CDN the header will be in the form X-Cache: MISSand X-Cache-Version: $Thời_gian_ timestamp_lưu_cachein CDN
For details of each type, please refer to the instructions below:
Purge by ALL: will delete all links (all Cache of resources on CDN).
Before Purge Cache the files were cached in CDN
Change the contents of the files, then refresh the browser. Because the files have been cached in CDN, when changing in Origin, the files in CDN have not been changed.
Proceed to Purge Cache: Select the corresponding Service and CDN and Purge by ALL
After Purge cache CDN calls back to Origin to get the latest content.
Purge by BEGIN: Will delete all resources currently cached in CDN starting with the entered character.
Similar to Purge by ALL, before Purge Cache, the files have been cached in CDN. Proceed to Purge Cache: Select Service and corresponding CDN and Purge by BEGIN . At URI enter: /purge_lab/text*(delete cache of all text* files in vCDN).
After Purge the file /purge_lab/text*is checked and called back to Origin to get the latest content.
Since the files /purge_lab/demo*are not purged, the content is still fetched from the CDN Cache.
Purge by CONTAIN: Will delete all resources currently cached in CDN that contain the entered string.
Similar to Purge by ALL, before Purge Cache, the files have been cached in CDN. Proceed to Purge Cache: Select Service and corresponding CDN and Purge by CONTAIN . At URI enter: /*demo* (clear cache of all *demo* files currently cached in vCDN).
After Purge Cache the files /purge_lab/demo1.txt... Were called back to Origin to get new content.
Files /purge_lab/text1.txt... Still get content from Cache in CDN
Purge by END: Will delete all resources that are being cached in vCDN at the end of the input string.
Similar to Purge by ALL, before Purge Cache, the files have been cached in CDN. Proceed to Purge Cache: Select Service and corresponding CDN and Purge by END . At URI enter: /*1.txt (clear cache of all *1.txt files currently cached in CDN).
After Purge Cache the files /*1.txt... Were called back to Origin to get new content.
Files /purge_lab/text1.txt... Still get content from Cache in CDN.
Purge by URI(s): Will delete exactly the specified link.
Similar to Purge by ALL, before Purge Cache, the files have been cached in CDN. Proceed to Purge Cache: Select Service and corresponding CDN and Purge by URI(s) . At URI, enter: /purge_lab/demo1.txt, /purge_lab/demo2.txt... (clear cache of specified links that are cached in vCDN).
After Purge Cache the files /purge_lab/demo1.txt... Were called back to Origin to get new content.
Other files not specified Purge Cache ... Still fetch content from Cache in CDN.
