HTTP

• get the HTTP header
• wget -S http://www.cnn.com

github

• git config --global user.email "whatever@yahoo.com"   (your github email, used to identified the committer)
• git config --global user.name "blah blah"
• git add toto.txt
• git commit -am"my test"
• git push

• to see commit graph
• "insight" / "network"

• [old way] About keys: generate keys on each machine from which you want to clone, and add them in gitlab

ssh-keygen -t rsa -C "an.lfl@sony.com"
cat ~/.ssh/id_rsa.pub
add the output of the cat as a new machine key in gitlab in: gitlab.leguide.com/profile/keys 

then you will need to do this on the client machine:
l@al:~/l/catalogs$ git config --global user.email "toto@toto.com"
l@al:~/l/catalogs$ git config --global user.name "Bob Doe"

l@al:~/l/catalogs$ git config  -l       (to check what's in)

• new way
• github improved the security 
• https://github.blog/2021-09-01-improving-git-protocol-security-github/
• https://docs.github.com/en/authentication/troubleshooting-ssh/error-permission-denied-publickey 
• https://docs.github.com/en/authentication/connecting-to-github-with-ssh/checking-for-existing-ssh-keys
• ssh-keygen -t ed25519 -C "xml@yahoo.com"
• eval "$(ssh-agent -s)"
• ssh-add ~/.ssh/id_ed25519
• set keys in github
• https://github.com/settings/keys
• Note:
• listing private key this way doesn't list ed25519 keys:
• "ssh-add -l -E sha256"
• you can use instead
• "ssh -vT git@github.com"