question: public AWS4SignerBase ( URL endpointUrl , String httpMethod , String serviceName , String regionName ) { this . endpointUrl = endpointUrl ; this . httpMethod = httpMethod ; this . serviceName = serviceName ; this . regionName = regionName ; dateTimeFormat = new SimpleDateFormat ( ISO8601BasicFormat ) ; dateTimeFormat . setTimeZone ( new SimpleTimeZone ( 0 , "UTC" ) ) ; dateStampFormat = new SimpleDateFormat ( DateStringFormat ) ; dateStampFormat . setTimeZone ( new SimpleTimeZone ( 0 , "UTC" ) ) ; }
target:  Create a new AWS V4 signer.