501 Transfer-Encoding not implemented on a PUT. Wtf?

[nickretallack]

I'm trying to use knox to put some data on S3 but it always fails with a 501. Here's my code. Ignore the extra returns -- it's generated from coffee-script.

  knox = require('knox');
  s3 = knox.createClient({####SECRET####})
  test_s3 = function() {
    var buffer, request;
    buffer = new Buffer(6);
    buffer.write("Hello");
    request = s3.put('test-key');
    return request.on('response', function(response) {
      console.log(response.statusCode);
      return response.on('data', function(data) {
        return console.log(data.toString('ascii'));
      });
    });
  };
  test_s3();

What I get on the console is this:

501
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>NotImplemented</Code><Message>A header you provided implies functionality that is not implemented</Message><Header>Transfer-Encoding</Header><RequestId>67F400ED6D76C07A</RequestId><HostId>oyEU9C4gk/Kf6PQta2roQ2q0Pe1cfvi1BeoVUhsEPNV5qf/39ZmOVXCn5HqdCZtq</HostId></Error>

This doesn't make sense to me. Googling around, I found that S3 usually returns this response when you try and do some operation that shouldn't send any content, but you sent content anyway. But this is a put. It's supposed to have content. Looking through the request object, it appears that content length is set and the body is being written as it should be. So what is going wrong?

[nickretallack]

Oh, this is what happens when I don't send the content length. Also in this example code I forgot to send the buffer too. Whoops.

[pflammertsma]

This issue was really useful to me, as it wasn't evident that "Content-Length" was a mandatory field. Totally obvious, but the response error is very confusing.