An error with the docs of $host

[姚伟斌]

Hi,

In the docs of $host at
http://nginx.org/en/docs/http/ngx_http_core_module.html#variables, it says:

$host
“Host” request header field, or the server name matching a request if this
field is not present

It's not right with the host header like: www.example.com:1234.  The $host
variable always strips the port.

-- 
Weibin Yao
Developer @ Server Platform Team of Taobao
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