[LINUX] How to manually update the AMP cache


Pages that support AMP are cached by the provider on the Google side, and the cached pages are delivered from there, achieving high-speed web pages. So the question is how to update the cached page. This article describes how to manually update the AMP cache using a mechanism called update-cache. In WordPress etc., when you update the article, you need to update the cache of the AMP page as well.


  1. Create a private key and public key
  2. Place the public key on the application server
  3. Create a program that requests update-cache
  4. Run update-cache

Create private key and public key

Create a private key and public key locally.

$ openssl genrsa 2048 > private-key.pem
$ openssl rsa -in private-key.pem -pubout > apikey.pub

Place the public key on the application server

Place the public key on the server. Please place it in the following location.

/Document root/.well-known/amphtml/apikey.pub

You need to add "text / plain" to the content type in the web server configuration file. This is the setting method for Nginx.


types {
     #Add to the end
     text/plain    pub;

nginx reboot

$ sudo systemctl restart nginx

Make sure that the public key "apikey.pub" is accessible and that the content type is "text / plain".

$curl -I https://example.com/.well-known/amphtml/apikey.pub

If the HTTP part and content-type part are displayed as shown below, you can set them without any problem.

HTTP/2 200
content-type: text/plain

Creating a program that requests update-cache

Originally, refer to Google's official document "Update AMP content" and update using a manually created key. -I make a cache request, but I'm grateful to use it because there is a predecessor who creates a series of flows with a shell script. https://github.com/sizaki30/google-amp-update-cache

After downloading the script, change the private key location.

# private_Change the key part.
private_key='/Specify the location of the private key with the full path/private-key.pem'

Upload the script anywhere on the server.

Run update-cache

Run the script, specifying the URL of the page for which you want to update the AMP cache. (It is recommended to quote the URL.) If "OK" is displayed, the update-cache request is successful.

$sudo sh google-amp-update-cache.sh 'https://example.com/test.html'

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