Rest API - need help in sending attachment

[Rishi Agr]

Hi,
I am trying to send attachment in a post request and I am unable to. I've
used multipart/* as the consumer content-type and it's not working. I tried
to debug and found that post request takes only application/json. The
OPTIONS request had all the types supported and I tried that as well. Added
a switch case for OPTIONS in apply method of RestRequestHandler class but
was not successful. Can someone please let me know how can I achieve this?
Thank you. Rishi