merge revision(s) 59693,59695: [Backport #13852]
A HTTP Header value must not contain CR or LF. to_str -> to_s * lib/net/http/header.rb (set_field): `val` can not have `to_str`.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59783 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 59693,59695: [Backport #13852]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@59783 b2dd03c8-39d4-4d8f-98ff-823fe69b080e