cloudant发布错误的请求

Question

I am trying to post json objects into a cloudant database. Why am I receiving a "400 bad request" response?

pos = {
    'lat': position.coords.latitude,
    'long' : position.coords.longitude
    };
    $.ajax({
      type: "POST",
      url: 'http://03353b2e-7d68-462a-b0ab-d5feeae889fd-bluemix.cloudant.com/locations',
      data: pos,
      contentType: "application/json",
      dataType: 'json'
    });

Answer 1

fixed by using

data: JSON.stringify(pos)

Thanks to Nico O for answer