Squid url_rewriter

Im have setup redhat 7.5 squid with custom redirecting program writing python. but redirection not working and /var/log/squid/cache.log gives this error.
2018/07/25 23:19:16 kid1| helperHandleRead: unexpected reply on channel 0 from redirector #Hlpr2 ''
2018/07/25 23:19:16 kid1| helperHandleRead: unexpected reply on channel 0 from redirector #Hlpr3 ''
2018/07/25 23:19:17 kid1| helperHandleRead: unexpected reply on channel 0 from redirector #Hlpr2 ''
2018/07/25 23:19:20 kid1| helperHandleRead: unexpected reply on channel 0 from redirector #Hlpr2 ''
2018/07/25 23:19:20 kid1| helperHandleRead: unexpected reply on channel 0 from redirector #Hlpr3 ''
help me to solve this or give sample of rewrite program written in python.