isapi中的一个转向例子

DWORD CUrltest1Filter::OnUrlMap(CHttpFilterContext* pCtxt,
 PHTTP_FILTER_URL_MAP pMapInfo)
{
 // TODO: React to this notification accordingly and
 // return the appropriate status code
 char buffer[1024];
 DWORD bufferSize=sizeof(buffer);
 pCtxt->GetServerVariable("SERVER_NAME", buffer, &bufferSize);
//  if (strstr (pMapInfo->pszURL, "DoRedirect"))
  if (strstr (buffer, "localhost"))
   {
      CHAR szRedirect [256];
      // replace www.microsoft.com with desired server
      sprintf(szRedirect, "Location: http://%s/r/n/r/n", "www.microsoft.com");
      pCtxt->ServerSupportFunction ( SF_REQ_SEND_RESPONSE_HEADER,
            (LPVOID) "302 Redirect",
            (DWORD *) szRedirect,
            0 );
      // Print a message to the debug window
      ISAPITRACE1 ("Redirecting to: %s/n", szRedirect);
      // we are done with this request
      return SF_STATUS_REQ_FINISHED_KEEP_CONN;
   }
   // URL did not contain a DoRedirect string.

 return SF_STATUS_REQ_NEXT_NOTIFICATION;
}

不同于我上一篇isapi的写法用了 pCtxt->GetServerVariable("SERVER_NAME", buffer, &bufferSize);
GetServerVariable其实与asp的Request.ServerVariable是一个例子,参考msdn中的

ALL_HTTP	All HTTP headers that were not already parsed into one of the above variables. These variables are of the form HTTP_<header field name>.
AUTH_TYPE	Contains the type of authentication used.  For example, if Basic authentication is used, the string will be "Basic". For Windows NT Challenge-response, it will be "NTLM". Other authentication schemes will have other strings. Because new authentication types can be added to Internet Server, it is not possible to list all possible strings. If the string is empty then no authentication is used.
CONTENT_LENGTH	The number of bytes which the script can expect to receive from the client.
CONTENT_TYPE	The content type of the information supplied in the body of a POST request.
GATEWAY_INTERFACE	The revision of the CGI specification to which this server complies. The current version is CGI/1.1.
HTTP_ACCEPT	Special case HTTP header. Values of the Accept: fields are concatenated, separated by ", ". For example, if the following lines are part of the HTTP header: accept: */*; q=0.1 accept: text/html accept: image/jpeg then the HTTP_ACCEPT variable will have a value of: */*; q=0.1, text/html, image/jpeg
PATH_INFO	Additional path information, as given by the client. This comprises the trailing part of the URL after the script name but before the query string (if any).
PATH_TRANSLATED	This is the value of PATH_INFO, but with any virtual path name expanded into a directory specification.
QUERY_STRING	The information which follows the ? in the URL which referenced this script.
REMOTE_ADDR	The IP address of the client.
REMOTE_HOST	The hostname of the client.
REMOTE_USER	This contains the username supplied by the client and authenticated by the server.
REQUEST_METHOD	The HTTP request method.
SCRIPT_NAME	The name of the script program being executed.
SERVER_NAME	The server's hostname (or IP address) as it should appear in self-referencing URLs.
SERVER_PORT	The TCP/IP port on which the request was received.
SERVER_PROTOCOL	The name and version of the information retrieval protocol relating to this request. Normally HTTP/1.0.
SERVER_SOFTWARE	The name and version of the web server under which the CGI program is running.

 

会发现其实都是一样的