Environment variable checker

■HTTP_HOST

The server name of the HTTP request destination.(The name of DNS)

■HTTP_USER_AGENT

String that represents a user agent (the type,such as a browser) that have access to the page.

■HTTP_ACCEPT

Available type of media.
*/* represents all other.It is possible multiple specification,and priority specification.Multiple specification is done separated by commas.Priority specification is done by specifying the quality value after the semicolon (; ) If you omit the quality value will be 1.

■HTTP_ACCEPT_LANGUAGE

Available language code.
It is possible multiple specification,and priority specification

■HTTP_ACCEPT_ENCODING

Available encoding formats.
For example If you tell them that supports the gzip format to the server ,it can be sent to the browser to gzip compress the HTTP message body.You can separated priority specification by commas.

■HTTP_ACCEPT_CHARSET

Available character set.
* represents all other.It is possible multiple specification,and priority specification

■HTTP_KEEP_ALIVE

The longest time to maintain the connection between the connection destination.

■HTTP_CONNECTION

State of the connection

■SERVER_NAME

Host name of the server under which the current script is running.

■SERVER_ADDR

IP address of the server under which the current script is running.

■SERVER_PORT

Port number that is used as a communication port of the Web server.

■REMOTE_HOST

The host name from which the user is viewing the current page

■REMOTE_ADDR

IP address of the user who is currently looking at the page.

■REMOTE_PORT

The number of the port used by the user to communicate with the server.

■GATEWAY_INTERFACE

Version of CGI the server is using

■SERVER_PROTOCOL

Protocol name and version ,when the page is requested.

■REQUEST_METHOD

The name of request method was used to access the page.
Such as 'GET', 'HEAD', 'POST', 'PUT'

■QUERY_STRING

Search argument when the page is accessed.

■REQUEST_URI

The URI which was given in order to access the page