merge revision(s) 60021: [Backport #13926]
HTTPHeader#add_field should allow binary [Bug #13926]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61373 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 60021: [Backport #13926]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@61373 b2dd03c8-39d4-4d8f-98ff-823fe69b080e