question: protected byte [ ] fetchClass ( String classname ) throws Exception { byte [ ] b ; URL url = new URL ( "http" , server , port , "/" + classname . replace ( '.' , '/' ) + ".class" ) ; URLConnection con = url . openConnection ( ) ; con . connect ( ) ; int size = con . getContentLength ( ) ; InputStream s = con . getInputStream ( ) ; if ( size <= 0 ) b = readStream ( s ) ; else { b = new byte [ size ] ; int len = 0 ; do { int n = s . read ( b , len , size - len ) ; if ( n < 0 ) { s . close ( ) ; throw new IOException ( "the stream was closed: " + classname ) ; } len += n ; } while ( len < size ) ; } s . close ( ) ; return b ; }
target:  Fetches the class file of the specified class from the http server.