Special Multipart Request (not through form)

Hi All,

Is there any open source API that handles multipart post requests that are NOT from the "multipart/from-data" type.
My HTTP client is NOT a browser , but "home made" HTTP client. Still it's important for me to send a multipart request that will contain some multipart content , which the server could resolve and therefor invoke the required logic.

Any Suggestions ? 

        Thanks in advanced	

Amos