question: private String decodePercent ( String str ) throws InterruptedException { try { StringBuffer sb = new StringBuffer ( ) ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { char c = str . charAt ( i ) ; switch ( c ) { case '+' : sb . append ( ' ' ) ; break ; case '%' : sb . append ( ( char ) Integer . parseInt ( str . substring ( i + 1 , i + 3 ) , 16 ) ) ; i += 2 ; break ; default : sb . append ( c ) ; break ; } } return sb . toString ( ) ; } catch ( Exception e ) { sendError ( HTTP_BADREQUEST , "BAD REQUEST: Bad percent-encoding." ) ; return null ; } }
target:  Decodes the percent encoding scheme. <br/> For example: "an+example%20string" -> "an example string"