use ureq_multipart::MultipartBuilder;

let (content_type,data) = MultipartBuilder::new()
            .add_file("test","/home/feiy/Desktop/1.txt").unwrap()
            .add_text("name","value")
            .finish().unwrap();
let resp: Value = ureq::post("http://some.service.url")
            .set("Content-Type", &content_type)
            .send_bytes(&data)?
            .into_json()?

use ureq_multipart::MultipartRequest;

let resp: Value = ureq::post("http://some.service.url")
            .send_multipart_file("name","&/home/feiy/Desktop/1.txt")?
            .into_json()?