gzip_example.js

var sys = require("sys"),
    http = require("http"),
    port = 12345,
    spawn = require("child_process").spawn;

function gzipStr (str, callback) {
  var child = spawn("gzip", ["-c", "-f", "-n"]),
      stdout = "", stderr = "";

  child.stdout.addListener("data", function (chunk) {
    stdout += chunk;
  });

  child.stderr.addListener("data", function (chunk) {
    stderr+= chunk;
  });

  child.addListener("exit", function (code) {
    sys.puts("input: \""+ str+ "\"\n-->"+ hexdump(stdout));
    callback(code ? "" : stdout);
  });

  child.stdout.setEncoding('binary');
  child.stdin.write(str, "utf8");
  child.stdin.close();
};

function hexdump (input, r, i) {
 r= "";
 if (typeof input === "string") {
   i= 0;
   while (i < input.length) {
     r+= hexdump(input.charCodeAt(i++));
   }
 } else if (typeof input === "number") {
   i= input.toString(16);
   i= (i.length < 2) ? "0"+i : i;
   r= i+ ".";
 }
 return r;
}


http.createServer(function (request, response) {

 if (request.url.indexOf("favicon") >= 0) {
   response.writeHeader(404, {});
   response.write("");
   return response.close();
 }

 gzipStr("this is a test", function (str) {
   response.writeHeader(200, {
     "Content-Type": "text/plain",
     "server":"Node.js",
     "Content-Encoding":"gzip",
     "Connection":"close",
     "Content-Length":str.length
   });
   response.write(str, "binary");
   response.close();
 });

}).listen(port);

sys.puts("Server running at http://localhost:"+ port+ "/");