| Server environment variables | illustrate |
| Request.ServerVariables | |
| ALL_HTTP | All HTTP header files sent by the client. |
| ALL_RAW | Searches all titles in the unprocessed form. ALL_RAW and ALL_HTTP, ALL_HTTP puts HTTP_ prefix in front of the title file name, and the title name is always capitalized. When using ALL_RAW, the title name and value appear only when the client sends it. |
| APPL_MD_PATH | Retrieves the metadatabase path to the (WAM) Application of the ISAPI DLL. |
| APPL_PHYSICAL_PATH | Searches the physical path corresponding to the metadatabase path. IIS returns the value by converting APPL_MD_PATH to a physical (directory) path. |
| AUTH_PASSWORD | This value is entered into the client's authentication conversation. This variable is only available when basic authentication is used. |
| AUTH_TYPE | This is the verification method used by the server to verify the user when the user accesses a protected script. |
| AUTH_USER | Unauthenticated username. |
| CERT_COOKIE | A unique ID for client verification, returned as a string. Can be used as a signature for the entire client verification. |
| CERT_FLAGS | If there is client verification, bit0 is 1. |
| If the client-verified verifier is invalid (not in the CA list recognized by the server), bit1 is set to 1. | |
| CERT_ISSUER | Issuer fields in user verification (O=MS, OU=IAS, CN=user name, C=USA). |
| CERT_KEYSIZE | The number of bits of the secure socket layer connection keyword, such as 128. |
| CERT_SECRETKEYSIZE | The server verifies the number of digits of private keywords. Such as 1024. |
| CERT_SERIALNUMBER | User-verified Serial Number field. |
| CERT_SERVER_ISSUER | The issuer field for server verification. |
| CERT_SERVER_SUBJECT | The main field for server verification. |
| CERT_SUBJECT | The main field for client verification. |
| CONTENT_LENGTH | The length of content issued by the client. |
| CONTENT_TYPE | The data type of content. Used with queries with additional information, such as HTTP query GET, POST, and PUT. |
| GATEWAY_INTERFACE | Revisions to the CGI specification used by the server. The format is CGI/revision. |
| HTTP_HeaderName | Values stored in the title file. The title file not included in the table must be prefixed with HTTP_ to enable the ServerVariables collection to retrieve its value. |