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Large enterprises usually host PAC files on a central web server using Web Proxy Auto-Discovery (WPAD). However, pointing a browser to a local file via proxy-url-file:/// offers critical advantages: API proxy configuration reference | Apigee Edge

Server-Side Request Forgery (SSRF) occurs when a web application fetches a remote resource without validating the user-supplied URL. An attacker can abuse this to force the application to send crafted requests to unexpected destinations, even if those destinations are protected by a firewall or are local to the server. Role of proxy-url-file-3A-2F-2F-2F proxy-url-file-3A-2F-2F-2F