Another rfc2068 fix.

ERR_REQUEST_DENIED now returns a 403 status code. Note that I'm assuming
this error occurs because the proxy is configured to not allow connection
to non-i2p destinations. If it's issued for other reasons we might want
to consider using 503 instead.

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPClient.java

@@ -45,7 +45,7 @@ public class I2PTunnelHTTPClient extends I2PTunnelClientBase implements Runnable
     private String wwwProxy;
 
     private final static byte[] ERR_REQUEST_DENIED =
-        ("HTTP/1.1 404 Not Found\r\n"+
+        ("HTTP/1.1 403 Access Denied\r\n"+
          "Content-Type: text/html; charset=iso-8859-1\r\n"+
          "Cache-control: no-cache\r\n"+
          "\r\n"+