ServerVariables set to retrieve predefined Environment Variables

Server Environment Variables	Description
Request. ServerVariables
ALL_HTTP	All HTTP header files sent by the client.
ALL_RAW	Retrieve all titles in the unprocessed table. Different from ALL_RAW, ALL_HTTP puts HTTP _ prefix before the title file name, and the title name is always capitalized. When ALL_RAW is used, the title name and value only appear when the client sends them.
APPL_MD_PATH	Retrieve the metadatabase path of the isapi dll (WAM) Application.
APPL_PHYSICAL_PATH	Search for the physical path corresponding to the metabase path. IIS converts APPL_MD_PATH to a physical (directory) path to return values.
AUTH_PASSWORD	Enter this value in the authentication dialog box of the client. This variable is available only when basic authentication is used.
AUTH_TYPE	When a user accesses a protected script, the server is used to verify the user's authentication method.
AUTH_USER	Unauthenticated User Name.
CERT_COOKIE	The unique ID verified by the client, which is returned as a string. It can be used as a signature for verification by the entire client.
CERT_FLAGS	If a client is verified, bit0 is 1.
	If the authenticated by the client is invalid (not in the CA list recognized by the server), bit1 is set to 1.
CERT_ISSUER	The issuer field in user verification (O = MS, OU = IAS, CN = user name, C = USA ).
CERT_KEYSIZE	Number of digits of the Secure Socket Layer connection keyword, such as 128.
CERT_SECRETKEYSIZE	The number of digits that the server verifies for a private keyword. For example, 1024.
CERT_SERIALNUMBER	The serial number field verified by the user.
CERT_SERVER_ISSUER	The issuer field for server verification.
CERT_SERVER_SUBJECT	Master field verified by the server.
CERT_SUBJECT	The main field verified by the client.
CONTENT_LENGTH	The length of the content sent by the client.
CONTENT_TYPE	The data type of the content. It is used together with the query of additional information, such as HTTP query GET, POST, and PUT.
GATEWAY_INTERFACE	Modify the CGI specification used by the server. The format is CGI/revision.
HTTP_HeaderName	The value stored in the title file. The title file not included in the table must be prefixed with HTTP _ For the ServerVariables set to retrieve its value.
Note:	The server interprets the underscore (_) in the HeaderName as the break number in the actual title. For example, if you specify HTTP_MY_HEADER, the server searches for the title file sent in the name of MY-HEADER.
HTTPS	If the request passes through the Secure Channel (SSL), ON is returned. If the request comes from an insecure channel, return OFF.
HTTPS_KEYSIZE	Number of digits of the Secure Socket Layer connection keyword, such as 128.
HTTPS_SECRETKEYSIZE	The number of digits that the server verifies for a private keyword. For example, 1024.
HTTPS_SERVER_ISSUER	The issuer field for server verification.
HTTPS_SERVER_SUBJECT	Master field verified by the server.
INSTANCE_ID	The ID of the text-formatted IIS instance. If the instance ID is 1, it appears as a character. You can use this variable to retrieve the ID of the Web server instance to which the request belongs (in the metabase.
INSTANCE_META_PATH	The metabase path of the IIS instance that responds to the request.
LOCAL_ADDR	Returns the server address that receives the request. This variable is very important if you look for the address used by the request on a multi-host machine bound with multiple IP addresses.
LOGON_USER	Log on to the Windows NT account.
PATH_INFO	The additional path information provided by the client. You can use these virtual paths and the PATH_INFO server variable to access the script. If the information comes from the URL, It is decoded by the server before it reaches the CGI script.
PATH_TRANSLATED	The version converted by PATH_INFO. The variable obtains the path and performs necessary ing from virtual to physical.
QUERY_STRING	Query question marks (?) in an HTTP request (?) .
REMOTE_ADDR	The IP address of the remote host that sends the request.
REMOTE_HOST	The name of the host that sent the request. If the server does not have this information, it will set the MOTE_ADDR variable to null.
REMOTE_USER	Unmapped user name string sent by the user. The name is the name actually sent by the user, which is opposite to the name modified by the server verification filter.
REQUEST_METHOD	This method is used to submit a request. It is equivalent to GET, HEAD, POST, and so on for HTTP.
SCRIPT_NAME	The virtual path for executing the script. The URL used for self-reference.
SERVER_NAME	The server host name, DNS alias, or IP address that appears in the Self-referenced UAL.
SERVER_PORT	The port number for sending the request.
SERVER_PORT_SECURE	String that contains 0 or 1. If the security port processes the request, it is 1; otherwise, it is 0.
SERVER_PROTOCOL	Name and revision of the Request Information Protocol. Format: protocol/revision.
SERVER_SOFTWARE	Name and version of the server software that responds to the request and runs the gateway. The format is name/version.
URL	Provide the basic part of the URL.