My website is hosted on Google App Engine using Standard Python.

In request handlers, I am setting HTTP header "cache-control: max-age=3600, 

So frontend server "Google Frontend" caches the response for 1hr(which I 
want to save cost).

In rare cases the content of page changes and I want the content in 
frontend cache to be invalidated. 

How can I do that? Is there any API for it?

I can't alter the URL as they have 90% traffic from Google Search.

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