denoland/deno · error

empty response from {url}

Error message

empty response from {url}

What it means

Error "empty response from {url}" thrown in denoland/deno.

Source

Thrown at cli/tools/desktop.rs:1960

    let url = Url::parse(&laufey_release_url(&archive))?;
    let progress_bar = ProgressBar::new(ProgressBarStyle::DownloadBars);
    let progress = progress_bar.update(&archive);
    // Send a real User-Agent — some CDNs (incl. parts of GitHub
    // releases) start rate-limiting empty UAs aggressively.
    let mut headers = http::HeaderMap::new();
    if let Ok(ua) = http::HeaderValue::from_str(&format!(
      "deno-desktop/{} (+https://deno.com)",
      env!("CARGO_PKG_VERSION")
    )) {
      headers.insert(http::header::USER_AGENT, ua);
    }
    let response = client
      .download_with_progress_and_retries(url.clone(), &headers, &progress)
      .await
      .with_context(|| format!("failed to download {url}"))?;
    let data = response
      .into_maybe_bytes()?
      .ok_or_else(|| deno_core::anyhow::anyhow!("empty response from {url}"))?;

    let actual =
      faster_hex::hex_string(&sha2::Sha256::digest(&data)).to_lowercase();
    let expected_lc = expected.to_lowercase();
    if actual != expected_lc {
      // Include the URL in the bail: an attacker who poisoned a redirect
      // would otherwise be invisible in the failure log.
      bail!(
        "checksum mismatch for {archive} (downloaded from {url})\n  expected: {expected_lc}\n  actual:   {actual}"
      );
    }

    let parent = dir.parent().ok_or_else(|| {
      deno_core::anyhow::anyhow!(
        "LAUFEY cache dir has no parent: {}",
        dir.display()
      )
    })?;

View on GitHub (pinned to 89f33cbef2)

When it happens

Trigger: Thrown at cli/tools/desktop.rs:1960 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of denoland/deno@89f33cbef2 (2026-08-16). Data as JSON: /api/errors/367c21b4890e6abb. Report an issue: GitHub.