Improvements
Often I got urls in the format (http://www.vim.org). Urls with braces around are not correctly recognized.
Therefore I added following lines to utl.vim around line 407:
call Utl_trace("- end getting URL under cursor.",1,-1)
let tmpurl = matchstr(url, '^[(].*[)]$')
if empty(tmpurl)
return url
else
call Utl_trace("- found braces around url, removing.",1,-1)
return substitute(url, '^[(]\(.*\)[)]$', '\1', 'g')
endif