Bypass Cisco Umbrella Block

Set up proxy server

• https://howchoo.com/mac/how-to-set-up-a-proxy-server-on-mac (opens in a new tab) (easy)
• http://doxfer.webmin.com/Webmin/Squid_Proxy_Server

Connect mac to use the proxy

• system/browser proxy setting
• via SwitchOmega

PAC file and Proxy

• https://findproxyforurl.com/ (opens in a new tab)
• https://github.com/uku/Unblock-Youku/blob/d1e5ff45e216561df634389bc584f28ea7f06d7e/shared/tools.js (opens in a new tab)

Debugging PAC files w/ alert

SwitchOmega FF don't support PAC profile https://github.com/FelisCatus/SwitchyOmega/issues/1146 (opens in a new tab).

Fallback to use FF or system proxy setting. Select the automatic proxy url.

Proxy url

via file file:///path/to/proxy.pac

Tools -> Web Developer -> Browser Console (Ctrl+Shift+J) [This is not Web Console!!] -> Filter output: PAC-alert

Http Tunneling

https://stackoverflow.com/questions/52596901/how-tunneling-services-like-localtunnel-works-without-ssh/52614266#52614266 (opens in a new tab)

localtunnel https://github.com/localtunnel/server (opens in a new tab)