Sending attachments/binary data from flex to Restful APIs

Hi,
We have a requirement of sending the files (or binary data) from flex GUI to Restful services(backend APIs). We are using flex HTTPService component to invoke the rest apis. The Rest APIs are designed to accept the multipart/mixed data which can support the binary data as well.
Can any one help us understand, how can we send the multipart/mixed OR multipart/form-data  from flex to backend using the HTTPService. Or is there a better way to send the mixed data from Flex GU to Restful APIs.
Request you to please respond to this at the earliest as this is very urgent.
Thanks and Regards,
--Revanth

Has anyone worked on this issue?? i wanted a quick response as we are in the middle of the development and this is a r
equirement
Thanks
-Revanth

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