log HTTP POSTs

logposts.js

var http = require('http'),
    util = require('util'),
    MemoryStream = require('memorystream'),
    argv = require('optimist')
           .usage('Usage: $0 [-a addr] [-p port]')
           .options('a', { alias: 'addr', default: '0.0.0.0' })
           .options('p', { alias: 'port', default: 1337 })
           .options('h', { alias: 'help' })
           .check(function(args) { if (args.h !== undefined) { throw ""; }})
           .argv;

var addr = argv.a,
    port = argv.p;

process.stdout.setMaxListeners(0);

http.createServer(function (req, res) {
  if (req.method == 'POST') {
    //console.log('POST'); // why does this help?
    var ms = new MemoryStream(),
        newlined = false,
        nlmatch = /\n$/;
    ms.pause();
    req.on('data', function(chunk) {
      newlined = nlmatch.test(chunk);
    });
    req.pipe(ms, { end : false });
    req.on('end', function() {
      if (!newlined) {
        ms.write('\n');
      }
      ms.end();
      ms.pipe(process.stdout, { end: false });
      res.writeHead(200, {'Content-Type': 'text/plain'});
      res.end('Thanks for POSTing.\n');
    });
  } else {
    res.writeHead(500, {'Content-Type': 'text/plain'});
    res.end('Usage: POST data to us. Thanks.\n');
  }
}).listen(port, addr);
console.log(util.format('Server running at http://%s:%d', addr, port));

Try:

node logposts.js &
curl --data "hello" http://127.0.0.1/

If you uncomment the console.log call in line 19, you'll see:

Server running at http://0.0.0.0:1337
POST
Thanks for POSTing.
hello

If you leave it commented out, the output of the POSTed content is missing:

Server running at http://0.0.0.0:1337
Thanks for POSTing.

Any ideas?

Replacing MemoryStream with morestreams.BufferedStream did the trick, at least for my small POSTs.