Postman allows testing APIs that handle file uploads and downloads. This includes multipart/form-data for uploads and binary file responses for downloads. These tests are essential for validating backend file handling logic.
File uploads usually use multipart/form-data, while downloads return binary streams with headers like Content-Disposition.
// Example of multipart file upload request
POST /upload HTTP/1.1
Content-Type: multipart/form-data
file=@document.pdf
// Example of file download response headers
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Disposition: attachment; filename="document.pdf"
In Postman, uploaded files appear in the request body preview. Downloaded files can be saved locally using the “Save Response” option when binary data is returned.
You can visually verify file uploads by checking server logs and response sizes. For downloads, inspect response headers and ensure binary mode is enabled.