public static void main (String[] args){
    try (Socket socket = new Socket("localhost", 80);
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "US-ASCII"), 100000000);) {

        StringBuilder sb = new StringBuilder();
        //Communication works fine with i<1000000
        for (int i=0; i<10000000; i++) {
            sb.append("a");
        }

        String output = "GET / " + sb.toString() + " HTTP/1.1" + "rn";
        writer.write(output, 0, output.length());
        writer.flush();

        InputStream is = socket.getInputStream();
        System.out.println((char) is.read());
    } catch (IOException e) {
        e.printStackTrace(System.out);
    }
}

@Override
    public Void call() throws IOException {
        try {
            OutputStream out = new BufferedOutputStream(
            connection.getOutputStream()
            );
            InputStream in = new BufferedInputStream(
            connection.getInputStream()
            );
            // read the first line only; that's all we need
            StringBuilder request = new StringBuilder(80);

            while (true) {
                int c = in.read();
                if (c == 'r' || c == 'n' || c == -1) break;
                request.append((char) c);
            }

            // If this is HTTP/1.0 or later send a MIME header
            if (request.toString().indexOf("HTTP/") != -1) {
            out.write(header);
            }
            out.write(content);
            out.flush();
        } catch (IOException ex) {
            logger.log(Level.WARNING, "Error writing to client", ex);
        } finally {
            connection.close();
        }
        return null;
    }