FileStream::into_request is only implemented for web targets

Error message

FileStream::into_request is only implemented for web targets

What it means

`FileStream::into_request` is only implemented for web (wasm32) targets; on any other platform it hits this compile-time-style guard. It fires when server file-streaming upload/download code is compiled into a non-web client build, meaning the caller must gate this API behind a web target.

Solutions

FileStream::into_request only exists on web targets. Gate this code to wasm32 web or use another payload type.

Defensive patterns

Strategy: validation

When it happens

Trigger: Thrown at packages/fullstack/src/payloads/files.rs:196 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/37a56c169ff2fb55. Report an issue: GitHub.

Appendix: source

Thrown at packages/fullstack/src/payloads/files.rs:196

                if let Some(length) = content_length {
                    builder = builder.header("Content-Length", length)?;
                }

                if let Ok(filename) = filename {
                    builder = builder.header(
                        "Content-Disposition",
                        format!("attachment; filename=\"{}\"", filename),
                    )?;
                }

                return builder
                    .header("Content-Type", content_type)?
                    .send_body_stream(stream)
                    .await;
            }

            unimplemented!("FileStream::into_request is only implemented for web targets");
        }
    }
}

impl<S> FromRequest<S> for FileStream {
    type Rejection = ServerFnError;

    fn from_request(
        req: Request,
        _: &S,
    ) -> impl Future<Output = Result<Self, Self::Rejection>> + Send {
        async move {
            tracing::info!("Extracting FileUpload from request: {:?}", req);

            let disposition = req.headers().get("Content-Disposition");
            let filename = match disposition.map(|s| s.to_str()) {
                Some(Ok(dis)) => {
                    let content = content_disposition::parse_content_disposition(dis);

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