added: config: base_url_redirect

when true the server checks whether HTTP_HOST environment variable
       is the same as base_url from the config (of course without the 'http://' part
       and the last slash) - if it's not the same then the server
       redirects you into a new location base_url+REQUEST_URI
changed: variables env_* from Request are never null (after Request::Read())
       if the server didn't set such a variable it will be pointing into an empty string "\0"


git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@465 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/request.h

@@ -41,11 +41,13 @@ struct Request
 	PostTable   post_table;
 	CookieTable cookie_table;
 	
-	// environment variables (can be null)
+	// environment variables
+	// they are not null -- when the server doesn't have such a variable it will be pointing into 'char_empty' which is default '\0'
 	const char * env_request_method;
 	const char * env_request_uri;
 	const char * env_http_cookie;
 	const char * env_remote_addr;
+	const char * env_http_host;
 
 	// current session
 	// is set after calling session_manager.SetSession()
@@ -107,6 +109,12 @@ struct Request
 	void SendAll();
 	
 	
+private:
+	// used to set some env_* variables into it, when the server didn't set that variable
+	// it contains '\0'
+	const char char_empty;
+	
+	const char * SetEnvVar(const char * var);
 };