      example => do/write/3?val=1
      example => do/write/3?val=HIGH
    */
-  {String("do/write/"), &doWriteTask},
+  {"do/write/", &doWriteTask},
 
   /*
      Swith digital pin mode.

     {port}  => port number.
     example => ai/read/0
   */
  {String("ai/read/"), &aiReadTask},

  /*
    Switch AI reference volt.

     {val}   => write value.
     example => ao/write/1?val=100
   */
  {"ao/write/", &aoWriteTask},

  /*
     Read DI port.
