# gem install html-proofer                                                   [R0 J0 L:0.51 0.41 0.33 U:0+13:35 pts/16 3947H]
Fetching: racc-1.6.0.gem (100%)
Building native extensions. This could take a while...
Successfully installed racc-1.6.0
Fetching: nokogiri-1.13.8-x86_64-linux.gem (100%)
ERROR:  While executing gem ... (Gem::RemoteFetcher::FetchError)
    bad response Forbidden 403 (https://api.rubygems.org/quick/Marshal.4.8/nokogiri-1.13.8-x64-unknown.gemspec.rz)