IBMi --> MS SQL Server Connection

I confess I have never done this before.
I am writing a CGI program, where I will receive a request asking to search
for and return two images, may be png, jpeg, bmp, etc.

These images live in a SQL Server table, I understand it's one column for
each image, and I also understand that these should be of type BLOB.

I have found quite a few documents that show how to configure the IBM i,
and it also says that on the side of the MS SQL Server it is required that
some service called msdrdaservice be up and running. I have been unable to
get this part of the process done, because I depend on the team that's on
the other side of the IBM i.

Even so, I think we're close to getting it. But I just don't know how to
manage the query that's going to give me back the two BLOB columns
containing the images. Moreover, I have never returned, say, a multipart
http response. I have read material but I need to do that by myself now.
:-D

I would greatly appreciate comments, suggestions, recommendations,
everything.

TIA

Javier.