devise

https://github.com/plataformatec/devise

Ruby

Flexible authentication solution for Rails with Warden.

Mail::Header#[]=

Sets the FIRST matching field in the header to passed value, or deletes
the FIRST field matched from the header if passed nil

Example:

 h = Header.new
 h.fields = ['To: [email protected]', 'X-Mail-SPAM: 15', 'X-Mail-SPAM: 20']
 h['To'] = '[email protected]'
 h['To']    #=> '[email protected]'
 h['X-Mail-SPAM'] = '10000'
 h['X-Mail-SPAM'] # => ['15', '20', '10000']
 h['X-Mail-SPAM'] = nil
 h['X-Mail-SPAM'] # => nil

Source | Google | Stack overflow

Edit

git clone [email protected]:plataformatec/devise.git
cd devise
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Header-----for-pr

# Commit to git

git add git commit -m "better docs for Mail::Header#[]="

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Header-----for-pr

hub pull-request

# Celebrate!