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Referenced Axum documentation: docs.rs
Hello all, I am trying to create a simple file upload using HTML5 forms and Rust Axum.
The issue is that, while any normal file works, larger files (particularly video files) which I want to upload are too large. Axum (subsequently Tokio) panics because the Field size is too large for the file upload.
I can't seem to find any helpful information about either expanding the stream limit.
<form action="/upload" method="POST" enctype="multipart/form-data">
<input type="file" name="filename" accept="video/mp4">
<input type="submit" value="Upload video">
</form>
async fn upload(mut multipart: Multipart) {
while let Some(mut field) = multipart.next_field().await.unwrap() {
let name = field.name().unwrap().to_string();
let data = field.bytes().await.unwrap();
println!("Length of `{}` is {} bytes", name, data.len());
}
}
thread 'tokio-runtime-worker' panicked at 'called `Result::unwrap()` on an `Err` value: MultipartError { source: failed to read stream: failed to read stream: length limit exceeded }', src/main.rs:84:40
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread 'tokio-runtime-worker' panicked at 'called `Result::unwrap()` on an `Err` value: MultipartError { source: failed to read stream: failed to read stream: length limit exceeded }', src/main.rs:84:40
thread 'tokio-runtime-worker' panicked at 'called `Result::unwrap()` on an `Err` value: MultipartError { source: failed to read stream: failed to read stream: length limit exceeded }', src/main.rs:84:40
To not take away from the primary part of this code, I have omitted the router, but its application is: .route("/upload", post(upload)) as per the example shown in the Axum documentation.
Quick note: to enable Multipart file uploads, you must add the Cargo feature flag "multipart" with Axum.
Any help is appreciated. Thank you.
671
asked Oct 21 '25 04:10
Have you tried using Axum's DefaultBodyLimit service?
use axum::{
Router,
routing::post,
body::Body,
extract::{DefaultBodyLimit, RawBody},
http::Request,
};
let app = Router::new()
.route(
"/",
// even with `DefaultBodyLimit` the request body is still just `Body`
post(|request: Request<Body>| async {}),
)
.layer(DefaultBodyLimit::max(1024));
I found this example here
125
answered Oct 24 '25 18:10
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