because special URI characters like '=' or '&' in tcp_uri_options
must stay as is and not be percent encoded because tcp_uri_options
contains all options like 'option1=value1&option2=value2'.
Test whether or not a "client-only" server is accessible.
@param [String] server_name string of the "client-only" server name
@return false if the "client-only" server is not accessible.