astral-sh/uv · error · reqwest_middleware::Error

HTTP {status} 'Location' value `{redirect_url}` is not a val

Error message

HTTP {status} 'Location' value `{redirect_url}` is not a valid HTTP URI: {err}

What it means

Error "HTTP {status} 'Location' value `{redirect_url}` is not a valid HTTP URI: {err}" thrown in astral-sh/uv.

Source

Thrown at crates/uv-client/src/base_client.rs:1024

        Err(DisplaySafeUrlError::Url(ParseError::RelativeUrlWithoutBase)) => original_req_url.join(location).map_err(|err| {
            reqwest_middleware::Error::Middleware(anyhow!(
                "Invalid HTTP {status} 'Location' value `{location}` relative to `{original_req_url}`: {err}"
            ))
        })?,
        Err(err) => {
            return Err(reqwest_middleware::Error::Middleware(anyhow!(
                "Invalid HTTP {status} 'Location' value `{location}`: {err}"
            )));
        }
    };
    // Per RFC 7231, fragments must be propagated
    if let Some(fragment) = original_req_url.fragment() {
        redirect_url.set_fragment(Some(fragment));
    }

    // Ensure the URL is a valid HTTP URI.
    if let Err(err) = redirect_url.as_str().parse::<http::Uri>() {
        return Err(reqwest_middleware::Error::Middleware(anyhow!(
            "HTTP {status} 'Location' value `{redirect_url}` is not a valid HTTP URI: {err}"
        )));
    }

    if redirect_url.scheme() != "http" && redirect_url.scheme() != "https" {
        return Err(reqwest_middleware::Error::Middleware(anyhow!(
            "Invalid HTTP {status} 'Location' value `{redirect_url}`: scheme needs to be https or http"
        )));
    }

    let mut headers = HeaderMap::new();
    std::mem::swap(req.headers_mut(), &mut headers);

    let cross_host = redirect_url.host_str() != original_req_url.host_str()
        || redirect_url.port_or_known_default() != original_req_url.port_or_known_default();
    if cross_host {
        if cross_origin_credentials_policy == CrossOriginCredentialsPolicy::Secure {
            debug!("Received a cross-origin redirect. Removing sensitive headers.");

View on GitHub (pinned to f1a42680ff)

When it happens

Trigger: Thrown at crates/uv-client/src/base_client.rs:1024 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/uv@f1a42680ff (2026-08-16). Data as JSON: /api/errors/8818b9d5601d5214. Report an issue: GitHub.