gistfile1.js

    server.addListener('request', function(req, res) {
      var chunks = [], bytes = 0;

      req.addListener('data', function(chunk) {
        // Gather up chunks & track total data length
        chunks.push(chunk);
        bytes += chunk.length;
      });

      // "req.getBody(encoding)" returns the body string
      req.getBody = function(encoding) {
        // Write all chunks into a Buffer
        var body = new Buffer(bytes), offset=0;
        chunks.forEach(function(chunk) {
          chunk.copy(body, offset, 0, chunk.byteLength);
          offset += chunk.byteLength;
        });

        // Return encoded (default to UTF8) string
        return body.toString(encoding || 'utf8', 0, body.byteLength);
      };
    });
  },