取得域名 :
request.domain #=> zool.it request.domain(2) #=> blog.zool.it

取得子域名:
request.subdomain #=> "test.blog" request.subdomain(2) #=> "test"
request.subdomain #=> ["test", "blog"] request.subdomain(2) #=> ["test"]

取得主机名:
request.host #=> "test.blog.zool.it"

取得带端口的主机名:
request.host_with_port #=> "test.blog.zool.it:3000"

代理服务器的主机名和端口:
request.raw_host_with_port #=> "test.blog.zool.it:3000"

取得由raw_host_with_port()获得的端口数值
request.port #=> 3000

取得raw_host_with_port()获得的端口文本字符串
request.port_string #=> ":3000"

取得当前使用网络协议
request.protocol #=> "http://"

取得网络协议
request.scheme #=> "http"

request请求的uri地址
request.request_uri #=> "/posts/Hello-World"

取得由env['SERVER_PORT']返回的端口值
request.server_port #=> "3000"

当前是否在是用https加密协议
request.ssl?() #=> false

返回网络协议标准端口(http为80, https为443)
request.standard_port #=> 80

判断当前协议是否是标准端口
request.standard_port? #=> false

取得当前requset完整url
request.url #=> "http://test.blog.zool.it:3000/posts/Hello-World"

获取客户端ip
request.remote_ip