This plugin will automatically flush Peakhour’s global CDN when editing posts,pages,media through the wordpress admin.
It also enables manual flushing based on URL patterns from within the wordpress admin.


  • Peakhour administration Tab


From within wordpress

  1. Log in to your wordpress admin
  2. Click on Plugins in the left menu
  3. Click on the ‘Add New’ button at the top of the page
  4. Search for ‘Peakhour’, we should be the first result!
  5. Click on ‘Install Now’
  6. Activate from your installed plugin page
  7. Click on in the left menu

Then in a new tab/browser window

  1. Log in to your Peakhour account at
  2. Click on ‘API Keys’ in the left menu
  3. Enter the name of your domain in the API key name and click ‘Create’
  4. Copy the generated API key and paste it into the ‘Peakhour API key’
  5. Go back to your wordpress window and paste the API key into the ‘Peakhour API key’ field
  6. enter your domain name (do not enter www or http:// etc)
  7. Click on ‘Save Changes’ at the bottom of the page
  8. Click on the ‘Test connection’ button that will now appear in the ‘Connection Settings’ section

Back in the Peakhour admin, configure cache settings

  1. Click on ‘Domains’ in the left menu
  2. Now click on the ‘Manage’ button on the right of your domain
  3. In the left navigation find CDN -> Settings and click
  4. Under the Skip CDN on cookie setting enter ‘wordpress_logged_in*’, this will cause the cache to be skipped for logged in users.
  5. Tick the ‘Ignore requests that invalidate’
  6. Towards the bottom of the page find the ‘Tag Header Name’ setting and enter ‘X-Cache-Tags’
  7. Next look at the ‘Tag Separator’ setting and select ‘comma’
  8. Save the settings.

Configure Caching rules

If wordpress is not sending cache control headers, this plugin won’t, then caching rules need to be set up. The following are for a standard
wordpress information site. If you have additional functionality, eg woocommerce, then additional configuration will be required.

  1. Continuing on from the configure cache settings section and find EDGE -> Rules in the left menu
  2. As a safeguard add in three no caching rules.
    2.1 Enter ‘php’ as the rule name, ‘ends_with(http.request.uri.path, “.php”)’ as the filter, add the setting ‘CDN Status’ and select disabled. Save
    2.2 Enter ‘wp-admin’ as the rule name, ‘http.request.uri.path eq “/wp-admin/”‘ as the filter, add the setting ‘CDN Status’ and select disabled. Save
  3. Add in the general caching rule. Enter ‘general page caching’ as the rule name, ‘ends_with(http.request.uri.path, “/”)’ as the filter, then add:
    CDN Status = enabled
    Strip Outgoing Cookies = enabled
    Strip Cookies from response = enabled
    Ignore Cache Headers = enabled
    Require Cache-Control for caching = disabled
    Browser TTL = don’t cache
    CDN TTL = 30 days


You can of course make the CDN TTL longer or shorter as required.


Do I need a Peakhour account?

Yes you will need to sign up for the Peakhour service at,
all new domains get a free trial

Do I need to do anything else?

The service will work out of the box but you will probably want to start caching full pages by setting up
page rules, see our guide to get started.


Ebrel 26, 2019
This plugin works perfectly for me. Also, the customer support is fast and thorough. Best speed optimisation plugin for a WordPress developer. Thanks again to the Peakhour team.
Read all 2 reviews

Contributors & Developers

“Peakhour” is open source software. The following people have contributed to this plugin.


Translate “Peakhour” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



* Option to exclude home page from post purging.


* Manuel purge by single url


* Flushing based on cache tags, people upgrading make sure you configure Cache tags.


  • Support php 5.4


* headers to show the requesting wordpress url and referring page for debugging flush requests.


* Option to Strip ‘ver=’ parameters off static resources.


* Add manual flushing options
* Ability to remove homepage from automatic flushing if your homepage doesn’t display posts etc


  • Flush post/page/category when editing through wordpress admin.