[squid-dev] how or where to show the debug message in squid code

[Liu Mark]

squid 3.5.27.   debug message in code such as

debugs(33, 5, HERE << "Certificate for " << sslConnectHostOrIp << " was 
successfully recieved from ssl_crtd");

where dose this message output. ...

Because i want to debug ssl in squid. thank you