Strange phenomenon of domain name access HTTP_HOST

Symptom {code...} The system {code...} is appended to the domain name by default.

Access domain name http://www.a.com. note that there is ., print $ _ SERVER ['HTTP _ host'] ==> www.a.com. (There is a. at the end .) $ _ SERVER ['request _ URI '] =>/

System

Centos7 + nginx 1.6.8

. It is appended to the domain name by default.

Reply content: Symptom

Access domain name http://www.a.com. note that there is ., print $ _ SERVER ['HTTP _ host'] ==> www.a.com. (There is a. at the end .) $ _ SERVER ['request _ URI '] =>/

System

Centos7 + nginx 1.6.8

. It is appended to the domain name by default.

Root Domain

Last multiple domain names.It is actually a formal writing method. Is the so-called FQDN, Fully-Qualified Domain Name.

The last point is used to distinguish the complete domain name ending with the root label from the relative domain name in the local domain name. It's like the absolute path in * nix is/Not starting/It starts with a relative path.

Reference: Trailing Dots in Domain Names