def remove_hop_by_hop_headers(headers):
 headers[:] = [(key, value) for (key, value) in headers if (not is_hop_by_hop_header(key))]

def remove_hop_by_hop_headers ( headers ) : headers [ : ] = [ ( key , value ) for ( key , value ) in headers if ( not is_hop_by_hop_header ( key ) ) ]
remove all http/1 .