foo.java

        HttpExchange exchange = new HttpExchange() {
            private volatile int count = 0;

            @Override
            public InputStream getRequestContentSource() {
                return new ByteArrayInputStream(new byte[0]);
            }

            @Override
            public Buffer getRequestContentChunk() throws IOException {
                System.out.println("CHUNK");
                switch (count++) {
                    case 0: return new ByteArrayBuffer("hello ".getBytes());
                    case 1: return new ByteArrayBuffer("world".getBytes());
                    default: return null;
                }
            }
        };
        exchange.setMethod("POST");
        exchange.setURL("http://localhost:8000/");
        http.send(exchange);
        exchange.waitForDone();

gistfile1.txt

brianm@binky:~/src/ning-nfs$ nc -v -l 8000
POST / HTTP/1.1
Host: localhost:8000
Content-Length: 0