Connecting to Google App Engine

I seem to be not successful with the Xively - I used a REST client which gave me the info that it works with HTTP, too, so I gave it a try:

PUT http://api.xively.com/v2/feeds/184885797­4
header: X-Api-Key: RMspyWqYIq1m9vEyuF9Q9BLpngLf4Tr1MlEhmDnH­TbAjQvG8
body: counter,2

in JS it looks like this - but was not able to get a request through:

function putXively() {
	digitalWrite(LED1,1);

    var options = {
      host: 'api.xively.com', 
      port: '80',
      path:'/v2/feeds/1848857974', 
      method:'put',
      headers: { "X-ApiKey":"RMspyWqYIq1m9vEyuF9Q9BLpngLf­4Tr1MlEhmDnHTbAjQvG8" }
    };

    var req = require("http").request(options, function(res)
    {
		res.on('data', function(data) {
        setTimeout(putXively, 2000);
		digitalWrite(LED1,0);
      });
    });
    req.end("counter," + counter++);
}

Yes, I posted my API key. Don't care, this is for testing. Feel free to use exactly the same key. The feed is also public, e.g. can be accessed via https://xively.com/feeds/1848857974

I made a few test calls via RESTclient, so some data is there. But unfortunately did not get a request through via the Espruino+CC3000.