question: private HttpURLConnection makeConnection ( URL url , byte [ ] postBody , long position , long length , boolean allowGzip , boolean followRedirects ) throws IOException { HttpURLConnection connection = ( HttpURLConnection ) url . openConnection ( ) ; connection . setConnectTimeout ( connectTimeoutMillis ) ; connection . setReadTimeout ( readTimeoutMillis ) ; synchronized ( requestProperties ) { for ( Map . Entry < String , String > property : requestProperties . entrySet ( ) ) { connection . setRequestProperty ( property . getKey ( ) , property . getValue ( ) ) ; } } if ( ! ( position == 0 && length == C . LENGTH_UNBOUNDED ) ) { String rangeRequest = "bytes=" + position + "-" ; if ( length != C . LENGTH_UNBOUNDED ) { rangeRequest += ( position + length - 1 ) ; } connection . setRequestProperty ( "Range" , rangeRequest ) ; } connection . setRequestProperty ( "User-Agent" , userAgent ) ; if ( ! allowGzip ) { connection . setRequestProperty ( "Accept-Encoding" , "identity" ) ; } connection . setInstanceFollowRedirects ( followRedirects ) ; connection . setDoOutput ( postBody != null ) ; if ( postBody != null ) { connection . setFixedLengthStreamingMode ( postBody . length ) ; connection . connect ( ) ; OutputStream os = connection . getOutputStream ( ) ; os . write ( postBody ) ; os . close ( ) ; } else { connection . connect ( ) ; } return connection ; }
target:  Configures a connection and opens it.