Problem: https://cdn.cocoapods.org

Problem

when I run pop install
macOS 10.15

Unable to add a source with url https://cdn.cocoapods.org/ named trunk.
You can try adding it manually in /Users/achunorigin/.cocoapods/repos or via pod repo add.

Solved

First, go to ~/.cocoapods/repos and run git clone https://github.com/CocoaPods/Specs.git master.
if git doesn't exist, run below first:

brew install git
git config --global --unset http.proxy 
git config --global --unset https.proxy

Add source 'https://github.com/CocoaPods/Specs.git' at Podfile top line which before platform :ios,...

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