header http status code

[dennis cao]

dear all
      I want to set the http status code use if directive not the error_page directive!
      I want to know what header variable  to get the http status code
       if ($header_something ∼＊ ‘404’) ｛
           return 402;
        }
       what is the $header_something?




thanks
 		 	   		  
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