Fix for unnecessary CORS pre-flight OPTIONS request on query calls
Fix for unnecessary CORS pre-flight OPTIONS request on query calls

The Content-Type header was being set on every request, resulting in
CORS pre-flight OPTIONS on Metadata and query calls.

Breeze/breeze.bridge.angular2,Breeze/breeze.bridge.angular,Breeze/breeze.bridge.angular,Breeze/breeze.bridge.angular,Breeze/breeze.bridge.angular2