Rust Example for ureq + multipart

main.rs

// A simple file uploader client template with Rust + ureq + multipart
// Released into the public domain by its author

use std::path::PathBuf;

use multipart::client::lazy::Multipart;

fn main() {
    let file_name = PathBuf::from(
        std::env::args_os()
            .skip(1)
            .next()
            .expect("file name required"),
    );
    let post_file = std::fs::File::open(&file_name).expect(&format!("cannot open {:?}", file_name));

    let file_extension = file_name.extension().and_then(|s| s.to_str()).unwrap_or("");
    let mime = mime_guess::from_ext(&file_extension).first_or_octet_stream();

    let mut m = Multipart::new();
    m.add_text("key", "value");
    m.add_stream("data", post_file, Some("blob"), Some(mime));

    let post_url = "http://file-storage.example.com/upload.cgi";

    eprintln!("Sending request...");
    let mdata = m.prepare().unwrap();
    let response = ureq::post(post_url.as_ref())
        .set(
            "Content-Type",
            &format!("multipart/form-data; boundary={}", mdata.boundary()),
        )
        .send(mdata);

    if let Some(e) = response.synthetic_error() {
        eprintln!("Upload failed: {}", e);
    } else {
        eprintln!("Upload successful.");
    }
}