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What are the server variables in ASP.NET / C# ? PDF Print E-mail
Written by Siva   
Saturday, 20 November 2010 17:44

Obtaining a client's browser information when a request is made to the server. C#. Request.ServerVariables
 


Description: 
Response.ServerVariables is used to retrieve information about the request header information or about the server environment variables.
    
Syntax:
Request.ServerVariables["x"]

 

Where x is a value from :
Variable Description
ALL_HTTP
All HTTP headers sent by the client.
ALL_RAW
Retrieves all headers in raw form. The difference between ALL_RAW and ALL_HTTP is that ALL_HTTP places an HTTP_ prefix before the header name and the header name is always capitalized. In ALL_RAW the header name and values appear as they are sent by the client.
APPL_MD_PATH
Retrieves the metabase path for the Application for the ISAPI DLL.
APPL_PHYSICAL_PATH
Retrieves the physical path corresponding to the metabase path. IIS converts the APPL_MD_PATH to the physical (directory) path to return this value.
AUTH_PASSWORD
The value entered in the client's authentication dialog. This variable is available only if Basic authentication is used.
AUTH_TYPE
The authentication method that the server uses to validate users when they attempt to access a protected script.
AUTH_USER
The name of the user as it is derived from the authorization header sent by the client, before the user name is mapped to a Windows account. This variable is no different from REMOTE_USER. If you have an authentication filter installed on your Web server that maps incoming users to accounts, use LOGON_USER to view the mapped user name.
CERT_COOKIE
Unique ID for the client certificate, returned as a string. This can be used as a signature for the whole client certificate.
CERT_FLAGS
bit0 is set to 1 if the client certificate is present.bit1 is set to 1 if the certification authority of the client certificate is invalid (that is, it is not in the list of recognized certification authorities on the server).
CERT_ISSUER
Issuer field of the client certificate (O=MS, OU=IAS, CN=user name, C=USA).
CERT_KEYSIZE
Number of bits in the Secure Sockets Layer (SSL) connection key size. For example, 128.
CERT_SECRETKEYSIZE
Number of bits in server certificate private key. For example, 1024.
CERT_SERIALNUMBER
Serial number field of the client certificate.
CERT_SERVER_ISSUER
Issuer field of the server certificate.
CERT_SERVER_SUBJECT
Subject field of the server certificate.
CERT_SUBJECT
Subject field of the client certificate.
CONTENT_LENGTH
The length of the content as given by the client.
CONTENT_TYPE
The data type of the content. Used with queries that have attached information, such as the HTTP queries GET, POST, and PUT.
GATEWAY_INTERFACE
The revision of the CGI specification used by the server. The format is CGI/revision.
HEADER_<HeaderName>
The value stored in the header HeaderName. Any header other than those listed in this table must be preceded by "HEADER_" in order for the ServerVariables collection to retrieve its value. This is useful for retrieving custom headers. Note: Unlike HTTP_<HeaderName>, all characters in HEADER_<HeaderName> are interpreted as-is. For example, if you specify HTTP_MY_HEADER, the server searches for a request header named MY_HEADER.
HTTP_<HeaderName>
The value stored in the header HeaderName. Any header other than those listed in this table must be preceded by "HTTP_" in order for the ServerVariables collection to retrieve its value. This is useful for retrieving custom headers. Note: The server interprets any underscore (_) characters in HeaderName as dashes in the actual header. For example, if you specify HTTP_MY_HEADER, the server searches for a request header named MY-HEADER.
HTTPS
Returns ON if the request came in through a secure channel (for example, SSL); or it returns OFF, if the request is for an insecure channel.
HTTPS_KEYSIZE
Number of bits in the SSL connection key size. For example, 128.
HTTPS_SECRETKEYSIZE
Number of bits in the server certificate private key. For example, 1024.
HTTPS_SERVER_ISSUER
Issuer field of the server certificate.
HTTPS_SERVER_SUBJECT
Subject field of the server certificate.
INSTANCE_ID
The ID for the IIS instance in textual format. If the instance ID is 1, it appears as a string. You can use this variable to retrieve the ID of the Web server instance (in the metabase) to which the request belongs.
INSTANCE_META_PATH
The metabase path for the instance of IIS that responds to the request.
LOCAL_ADDR
Returns the server address on which the request came in. This is important on computers where there can be multiple IP addresses bound to the computer, and you want to find out which address the request used.
LOGON_USER
The Windows account that the user is impersonating while connected to your Web server. Use REMOTE_USER, UNMAPPED_REMOTE_USER, or AUTH_USER to view the raw user name that is contained in the request header. The only time LOGON_USER holds a different value than these other variables is if you have an authentication filter installed.
PATH_INFO
Extra path information, as given by the client. You can access scripts by using their virtual path and the PATH_INFO server variable. If this information comes from a URL, it is decoded by the server before it is passed to the CGI script.
PATH_TRANSLATED
A translated version of PATH_INFO that takes the path and performs any necessary virtual-to-physical mapping.
QUERY_STRING
Query information stored in the string following the question mark (?) in the HTTP request.
REMOTE_ADDR
The IP address of the remote host that is making the request.
REMOTE_HOST
The name of the host that is making the request. If the server does not have this information, it will set REMOTE_ADDR and leave this empty.
REMOTE_PORT
The client port number of the TCP connection.
REMOTE_USER
The name of the user as it is derived from the authorization header sent by the client, before the user name is mapped to a Windows account. If you have an authentication filter installed on your Web server that maps incoming users to accounts, use LOGON_USER to view the mapped user name.
REQUEST_METHOD
The method used to make the request. For HTTP, this can be GET, HEAD, POST, and so on.
SCRIPT_NAME
A virtual path to the script being executed. This is used for self-referencing URLs.
SERVER_NAME
The server's host name, DNS alias, or IP address as it would appear in self-referencing URLs.
SERVER_PORT
The server port number to which the request was sent.
SERVER_PORT_SECURE
A string that contains either 0 or 1. If the request is being handled on the secure port, then this is 1. Otherwise, it is 0.
SERVER_PROTOCOL
The name and revision of the request information protocol. The format is protocol/revision.
SERVER_SOFTWARE
The name and version of the server software that answers the request and runs the gateway. The format is name/version.
URL
Gives the base portion of the URL.

Example (C#) :
Response.Write(Request.ServerVariables["REMOTE_ADDR"]);
Response.Write(Request.ServerVariables["HTTP_USER_AGENT"]);

Output :
10.18.0.2
Mozilla/4.0 (Mozilla 4.0; MSIE 6.01; Windows NT 5.0)

 
 

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