Environment Variables

Request Headers

Name	Description
HTTP_ACCEPT	Specifies which Internet media types are acceptable for the response.
HTTP_ACCEPT_CHARSET	Specifies which character encodings (confusingly called "charsets") are acceptable for the response.
HTTP_ACCEPT_ENCODING	Specifies which data format transformations, confusingly called content encodings (such as compression mechanisms), are acceptable for the response.
HTTP_ACCEPT_LANGUAGE	Specifies which natural languages are acceptable for the response.
HTTP_HOST	Specifies the Internet host and port number of the resource being requested.
HTTP_USER_AGENT	Contains information about the user agent (client) originating the request.

Name	Description
SERVER_SOFTWARE	The name and version of the information server software answering the request (and running the gateway). Format: name/version
SERVER_NAME	The server's hostname, DNS alias, or IP address as it would appear in self-referencing URLs.
SERVER_PROTOCOL	The name and revision of the information protocol this request came in with. Format: protocol/revision
SERVER_PORT	The port number to which the request was sent.
REQUEST_METHOD	The method with which the request was made, for example "GET", "HEAD", "POST", etc.
PATH_INFO	The extra path information, as given by the client. In other words, scripts can be accessed by their virtual pathname, followed by extra information at the end of this path.
QUERY_STRING	The information which follows the ? in the URL which referenced this script. This is the query information.
REMOTE_HOST	The hostname making the request. If the server does not have this information, it should set to REMOTE_ADDR and leave this unset.
REMOTE_ADDR	The IP address of the remote host making the request.