This can range from simple files, such as an avatar picture, to complex items such as ultra-secure, cryptographically signed contracts.

In any case, for many web services, this is a must-have - just as critical as the ability to download or access these files again once they are uploaded. In this guide, we’ll demonstrate how to implement file upload and download in a Rust web application.

We’ll use the warp web framework, but the basics will mostly apply to other async web frameworks. There’s a nifty crate for dealing with async multipart streams called mpart-async, which streams incoming files instead of loading them into memory completely, as warp does at this time (there is an issue for this). However, for the purpose of this tutorial, we’ll use warp’s built-in method for handling multipart requests. If your use case involves dealing with huge files you need to stream through or validate before loading into memory, the aforementioned mpart-async crate is a sensible way to go for now. We’ll build an example web application that enables users to upload. files folder with a randomly generated name and made available for download using the GET /files/$filename endpoint. To follow along, all you need is a reasonably recent Rust installation (1.39+) and a tool to send HTTP requests, such as cURL.įirst, create a new Rust project.

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