Http-Method changes from POST to OPTIONS when changing Content-Type

Question

I am using closure library to do a simple POST. I think XhrIo should work because from my machine when I use any other rest client ,like Firefox browser app RESTClient or Ch

Answer 1

FWIW mine also failed to update the type when I specified...

{'content-type':'application/json'}

However, if I corrected the case to

{'Content-Type':'application/json'}

... it worked.

Go figure.