question: public void clear ( ) { Properties sysprops = System . getProperties ( ) ; sysprops . remove ( "http.proxyHost" ) ; sysprops . remove ( "http.proxyPort" ) ; sysprops . remove ( "http.proxyUser" ) ; sysprops . remove ( "http.proxyPassword" ) ; sysprops . remove ( "https.proxyHost" ) ; sysprops . remove ( "https.proxyPort" ) ; sysprops . remove ( "ftp.proxyHost" ) ; sysprops . remove ( "ftp.proxyPort" ) ; Authenticator . setDefault ( new ProxyAuthenticator ( "" , "" ) ) ; }
target:  Clear all proxy settings.