The ServerVariables collection is used to retrieve the server variable values.
|server_variable||Required. The name of the server variable to retrieve|
|ALL_HTTP||Returns all HTTP headers sent by the client. Always prefixed with HTTP_ and capitalized|
|ALL_RAW||Returns all headers in raw form|
|APPL_MD_PATH||Returns the meta base path for the application for the ISAPI DLL|
|APPL_PHYSICAL_PATH||Returns the physical path corresponding to the meta base path|
|AUTH_PASSWORD||Returns the value entered in the client's authentication dialog|
|AUTH_TYPE||The authentication method that the server uses to validate users|
|AUTH_USER||Returns the raw authenticated user name|
|CERT_COOKIE||Returns the unique ID for client certificate as a string|
|CERT_FLAGS||bit0 is set to 1 if the client certificate is present and bit1 is set to 1 if the cCertification authority of the client certificate is not valid|
|CERT_ISSUER||Returns the issuer field of the client certificate|
|CERT_KEYSIZE||Returns the number of bits in Secure Sockets Layer connection key size|
|CERT_SECRETKEYSIZE||Returns the number of bits in server certificate private key|
|CERT_SERIALNUMBER||Returns the serial number field of the client certificate|
|CERT_SERVER_ISSUER||Returns the issuer field of the server certificate|
|CERT_SERVER_SUBJECT||Returns the subject field of the server certificate|
|CERT_SUBJECT||Returns the subject field of the client certificate|
|CONTENT_LENGTH||Returns the length of the content as sent by the client|
|CONTENT_TYPE||Returns the data type of the content|
|GATEWAY_INTERFACE||Returns the revision of the CGI specification used by the server|
|HTTP_<HeaderName>||Returns the value stored in the header HeaderName|
|HTTP_ACCEPT||Returns the value of the Accept header|
|HTTP_ACCEPT_LANGUAGE||Returns a string describing the language to use for displaying content|
|HTTP_COOKIE||Returns the cookie string included with the request|
|HTTP_REFERER||Returns a string containing the URL of the page that referred the request to the current page using an <a> tag. If the page is redirected, HTTP_REFERER is empty|
|HTTP_USER_AGENT||Returns a string describing the browser that sent the request|
|HTTPS||Returns ON if the request came in through secure channel or OFF if the request came in through a non-secure channel|
|HTTPS_KEYSIZE||Returns the number of bits in Secure Sockets Layer connection key size|
|HTTPS_SECRETKEYSIZE||Returns the number of bits in server certificate private key|
|HTTPS_SERVER_ISSUER||Returns the issuer field of the server certificate|
|HTTPS_SERVER_SUBJECT||Returns the subject field of the server certificate|
|INSTANCE_ID||The ID for the IIS instance in text format|
|INSTANCE_META_PATH||The meta base path for the instance of IIS that responds to the request|
|LOCAL_ADDR||Returns the server address on which the request came in|
|LOGON_USER||Returns the Windows account that the user is logged into|
|PATH_INFO||Returns extra path information as given by the client|
|PATH_TRANSLATED||A translated version of PATH_INFO that takes the path and performs any necessary virtual-to-physical mapping|
|QUERY_STRING||Returns the query information stored in the string following the question mark (?) in the HTTP request|
|REMOTE_ADDR||Returns the IP address of the remote host making the request|
|REMOTE_HOST||Returns the name of the host making the request|
|REMOTE_USER||Returns an unmapped user-name string sent in by the user|
|REQUEST_METHOD||Returns the method used to make the request|
|SCRIPT_NAME||Returns a virtual path to the script being executed|
|SERVER_NAME||Returns the server's host name, DNS alias, or IP address as it would appear in self-referencing URLs|
|SERVER_PORT||Returns the port number to which the request was sent|
|SERVER_PORT_SECURE||Returns a string that contains 0 or 1. If the request is being handled on the secure port, it will be 1. Otherwise, it will be 0|
|SERVER_PROTOCOL||Returns the name and revision of the request information protocol|
|SERVER_SOFTWARE||Returns the name and version of the server software that answers the request and runs the gateway|
|URL||Returns the base portion of the URL|
You can loop through all of the server variables like this:
The following example demonstrates how to find out the visitor's browser type, IP address, and more:
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