After further testing, it looks like the code that was previously working when it called for an oauthToken has stopped working. It doesn’t return any data, as it used to.
http://PROXY_ADDRESS.com/proxy/oauth/request_token?oauth_callback=APP_CALLBACK&oauth_consumer_key=CONSUMER_KEY&oauth_nonce=95959&oauth_signature_method=HMAC-SHA1&oauth_timestamp=1363882045&oauth_version=1.0&oauth_signature=iptTliU1jKZqJzHMF7u60hK8lwI%3D