HTTP AND PDF file download

I have some problems to send a PDF FILE to a http server using if_http_client class with for example methods :

CALL METHOD client->request->set_header_field

CALL METHOD client->send

CALL METHOD client->receive

I don’t want to use FM SO_NEW_DOCUMENT_ATT_SEND_API1, SO_NEW_DOCUMENT_ATT_SEND_MAPI , SO_NEW_DOCUMENT_SEND_API1

Could someone please give me a sample abap program doing this ?

It could be great.

Thanks