field.chunk() produces `Error parsing `multipart/form-data ` request` without further information

[EliasDerHai]

I am trying to stream chunks of my multipart upload to disk. (Previously I used field.bytes() which works fine but can produce OOM on my raspberry pi).

my code using multer v3.1.0 (through axum) looks like:

pub async fn write_all_chunks_of_field(path: &Path, mut field: Field<'_>) -> Result<(), Error> {
    info!(
        "Trying to write to {} - (content_type = {:?})",
        path.display(),
        field.content_type()
    );
    let mut file = File::create(path).await?;
    let mut c = 0;
    loop {
        match field.chunk().await {
            Err(e) => {
                error!("Error while chunking: {:?}", e);
                return Err(map_to_io_error(e));
            }
            Ok(option) => match option {
                None => {
                    info!("File written to {}", path.display());
                    break;
                }
                Some(b) => {
                    info!("{}: size = {}", c, b.len());
                    c += 1;
                    file.write_all(&*b).await?;
                }
            },
        }
    }
    Ok(())
}

Logs produced look like:

2025-02-13T19:22:45.628219Z TRACE axum::serve: connection 127.0.0.1:55554 accepted
2025-02-13T19:22:45.629305Z  INFO server::handler: Trying to write to "./data/upload_in_progress\\./67fd780
f-1c6f-421d-be72-d96ec240cdc5_BLKK7336.mp4" - (content_type = Some("video/mp4"))
2025-02-13T19:22:45.630431Z  INFO server::handler: 0: size = 31919
2025-02-13T19:22:45.630891Z  INFO server::handler: 1: size = 32768
2025-02-13T19:22:45.631552Z  INFO server::handler: 2: size = 65536
2025-02-13T19:22:45.632944Z  INFO server::handler: 3: size = 131072
2025-02-13T19:22:45.635134Z  INFO server::handler: 4: size = 262144
2025-02-13T19:22:45.638365Z  INFO server::handler: 5: size = 507904
2025-02-13T19:22:45.641431Z  INFO server::handler: 6: size = 507904
2025-02-13T19:22:45.644492Z  INFO server::handler: 7: size = 507904
2025-02-13T19:22:45.645066Z ERROR server::handler: Error while chunking: Error parsing `multipart/form-data
` request

I have tried curl, postman and my own tokio client app. It seems to happen always after 6-7 chunks, regardless of file being uploaded and content_type.
Anything that's smaller than that seems to run through without issues.

I am new to async programming in rust, so I am sorry if I made some obvious mistake. Any help welcome that would aid me in finding my issue would be highly appreciated

[EliasDerHai]

It's duplicate of this issue:
tokio-rs/axum#3216

        .layer(DefaultBodyLimit::disable())
        .layer(RequestBodyLimitLayer::new(
            50 * 1024 * 1024,
        ))

in main.rs fixed it.