LUMEN-API sending images as direct data (octet-stream) not possible?

Hello,

I want to create an API in Lumen.

With the API the users could upload images. After uploading a image, the API should forward this image to another external webservice by sending this picture as direct data (octet-stream) with appropriate MIME Content-Type header.

How can I deal it with Lumen API? Is there maybe a out-of-the-box-feature for that in Lumen?

Thank you very much.