add_result API method via node only works if routed through fiddler

Hi

I'm trying to use the TestRail API to write some methods in node.js in order to post test results to TestRail (to incorporate into the automated tests we're developing). I can get add_result to post a result to my test if I cURL it, but not if I make the same request in node - I get a 500 Internal server error. I can make GET requests in node, but not POSTs. I figured I'd route the request through Fiddler to see what's going on, and bizarrely the script began posting test results. I can't figure out where I'm going wrong - is this a known issue?

Thanks in advance,

Carrie