astral-sh/ruff · error · anyhow::Error

Failed to send response for request {id}: {error}

Error message

Failed to send response for request {id}: {error}

What it means

Error "Failed to send response for request {id}: {error}" thrown in astral-sh/ruff.

Source

Thrown at crates/ruff_server/src/session/client.rs:147

    /// and checked for cancellation (each request must have exactly one response).
    pub(crate) fn respond<R>(
        &self,
        id: &RequestId,
        result: crate::server::Result<R>,
    ) -> crate::Result<()>
    where
        R: serde::Serialize,
    {
        let response = match result {
            Ok(res) => lsp_server::Response::new_ok(id.clone(), res),
            Err(crate::server::Error { code, error }) => {
                lsp_server::Response::new_err(id.clone(), code as i32, error.to_string())
            }
        };

        self.main_loop_sender
            .send(Event::SendResponse(response))
            .map_err(|error| anyhow!("Failed to send response for request {id}: {error}"))
    }

    /// Sends an error response to the client for a given request ID.
    ///
    /// The response isn't sent immediately. Instead, it's queued up in the main loop.
    pub(crate) fn respond_err(
        &self,
        id: RequestId,
        error: lsp_server::ResponseError,
    ) -> crate::Result<()> {
        let response = lsp_server::Response {
            id,
            response_result: Err(error),
        };

        self.main_loop_sender
            .send(Event::SendResponse(response))
            .map_err(|error| anyhow!("Failed to send response: {error}"))

View on GitHub (pinned to 672bb4edf0)

When it happens

Trigger: Thrown at crates/ruff_server/src/session/client.rs:147 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/ruff@672bb4edf0 (2026-08-16). Data as JSON: /api/errors/bd6805b259eaf9cf. Report an issue: GitHub.