Use the HEAD verb to just retrieve see the document metadata (name, size, mime-type). The GET verb will retrieve the document (binary) data.
Please note that in Dream Apply a document stands for a single “page”. If the source document was a multi-page PDF or TIFF, it was rasterized and split into several documents corresponding to the number of the pages. The rasterization will normally be carried out at 150 dpi.
Even in case of single-page documents (JPEG files etc.) this will not return the original uploaded file bit-by-bit. In the process of uploading, the file is normalized to enhance contrast.
GET /api/applicants/123/documents/1 Host: apply.example.edu Authorization: DREAM apikey="..."
Content-Type: image/jpeg Content-Length: 1234 Last-Modified: 2014-05-16T14:59:53+00:00