How to do file uploads in Rust web server

Use the multipart crate with a web framework like actix-web to handle file uploads. Add actix-web and multipart to your Cargo.toml, then define a handler that extracts the file from the request body and saves it to disk.

use actix_web::{web, App, HttpServer, HttpResponse, Responder};
use actix_multipart::Multipart;
use futures_util::StreamExt;
use std::io::Write;

async fn upload(mut payload: Multipart) -> impl Responder {
    while let Some(item) = payload.next().await {
        let mut file = item.unwrap();
        let filename = file.content_disposition().unwrap().get_filename().unwrap();
        let mut f = std::fs::File::create(filename).unwrap();
        while let Some(chunk) = file.next().await {
            f.write_all(&chunk.unwrap()).unwrap();
        }
    }
    HttpResponse::Ok().body("File uploaded")
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    HttpServer::new(|| {
        App::new().route("/upload", web::post().to(upload))
    })
    .bind("127.0.0.1:8080")?
    .run()
    .await
}

File uploads in Rust web server setups accept files sent from a browser or app. The server listens for a specific request, grabs the file data from the incoming message, and writes it directly to your computer's hard drive. Think of it like a digital mailbox that automatically sorts incoming letters into a folder on your desk.