Extended maintenance of Ruby versions 1.8.7 and 1.9.2 ended on July 31, 2014. Read more
# File soap/mimemessage.rb, line 133
def contentid
if @contentid == nil and @headers.key?('content-id')
@contentid = @headers['content-id'].str
@contentid = $1 if @contentid =~ /^<(.+)>$/
end
@contentid
end