No Caching

This feature gives you the ability to force your app/website to get the latest version of a resource from the server, instead of getting a cached one.

This tutorial will show you how to use the No Caching feature to force your browser to get the latest version of a NY Times from their servers instead of getting a cached version.


Find the image URL

In Chrome, right-click the image -> select the “Copy image address” option

I am using this image URL

Enable SSL Proxying

In Charles, find the Request, right-click it and select “Enable SSL Proxying” from the dropdown.

The Request(s) you want to modify must be decrypted before you can use the No Caching feature

304 status code

If the Response has a 304 status code, you’re getting a cached result

Open No Caching settings screen

Tools -> No Caching

Now tick both “Enable No Caching” and “Only for selected locations” checkboxes

Enter URL you want to stop caching

Add -> paste image URL into the “Host” field -> press tab -> enter 443 as the “Port” value -> click OK to save -> click OK to close the settings screen

Resend the Request

Click the “Repeat” button to reload the Request

The status code of the Response should change from 304 to 200

How it works

As you can see from the screenshot, Charles swaps 2 headers in the Request (image on the left) with the ‘pragma’ and ‘cache-control’ headers in the second Request (image on the right)

You can also achieve a similar result by using Rewrites

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