A Web Proxy Source allows you to connect to any image that is addressable through a publicly-available URL. You provide the entire image URL of the Origin Image in the path of the imgix request.
Go to the Sources page in the imgix dashboard and click the New Source button.
Select Web Proxy from the Source Type dropdown. There are no parameters for the Web Proxy Source type.
Name the Subdomain you'd like to use as the base URL for your images.
Note: The subdomain name you choose is unique to your Source and can't be re-used. If you're setting up a Source with a lot of customization (particularly a Custom Domain), choose the name you plan to use going forward.
Click the Save button. Your Source will be queued for deployment and you will be directed to the Source Details page.
All Web Proxy Sources require URL signing, unlike the other Source types where it is optional (note that the Secure URLs box is checked and uneditable in the screen shot above). For information on securely signing imgix URLs, please see the Securing Images guide.
See the Advanced Source Settings for information about setting up custom domains, defaults, and cache TTL options.