This is a great tool if you want to quickly swap a hosted image, file, PDF, etc. with a locally stored one. This is useful if you don’t want to or don’t have time to rebuild and deploy a new instance of your application.
In this tutorial we are going to swap an image hosted on a website (we’re using NY Times hosted image) with one stored locally.
Prerequisites
- Download Charles
- Make sure you have setup the Charles Root certificate on your Mac before you proceed to the next step
Find the image URL
In Chrome, right-click the image -> select the “Copy image address” option
In this tutorial I am using an image hosted on the NY Times website
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 Map Local feature with it
Open Map Local settings screen
Tools -> Map Local -> tick “Enable Map Local”
Map URL to a local file
Add -> paste in the image URL into the “Host” field -> press tab -> enter 443 as the “Port” value -> click the “Choose” button -> select your image -> Click OK to save -> Click OK again to close the settings screen
Check the image has been swapped
In Chrome, reload the page to verify that your image has replaced the website’s one
Charles Docs-y 