tinyhumansai/openhuman · error

reqwest client must build

Error message

reqwest client must build

What it means

Panic payload on reqwest::Client::builder().build() in McpHttpClient's constructor: the builder sets overall + connect timeouts and a bounded redirect policy (so vanity-URL MCP servers that 30x to their real endpoint connect). Construction depends only on these static choices, so failure indicates a TLS/proxy environment problem and the expect aborts client creation for that MCP endpoint.

Source

Thrown at src/openhuman/mcp/http_client/client.rs:233

        endpoint: String,
        timeout_secs: u64,
        auth: McpAuthConfig,
        identity: McpClientIdentityConfig,
    ) -> Self {
        let builder = reqwest::Client::builder()
            .timeout(Duration::from_secs(timeout_secs))
            .connect_timeout(Duration::from_secs(10))
            // Follow a bounded number of redirects so servers published behind a
            // vanity/short URL that 30x-redirects to their real MCP endpoint
            // (e.g. `sh.inference.ac` -> `api.inference.sh/mcp`) connect instead
            // of failing with a raw `MCP HTTP 301`. `Policy::limited` is safe
            // here: reqwest strips sensitive headers (Authorization, Cookie) on
            // cross-origin redirects, so a server bearer token is never leaked
            // to the redirect target.
            .redirect(reqwest::redirect::Policy::limited(5));
        let builder =
            crate::openhuman::config::apply_runtime_proxy_to_builder(builder, "tool.mcp_client");
        let http = builder.build().expect("reqwest client must build");
        Self {
            endpoint,
            http,
            next_id: AtomicI64::new(1),
            client_info: McpClientInfo {
                name: identity.name,
                title: Some(identity.title),
                version: identity.version,
            },
            auth,
            state: Mutex::new(SessionState {
                negotiated_protocol_version: LATEST_PROTOCOL_VERSION.to_string(),
                ..SessionState::default()
            }),
        }
    }

    pub fn endpoint(&self) -> &str {

View on GitHub (pinned to 7491200858)

Solutions

1. Check environment proxy variables and their interaction with reqwest's defaults
2. Verify the TLS features compiled into this build
3. Propagate the error instead of panicking so one bad endpoint does not take down MCP init

When it happens

Trigger: Thrown at src/openhuman/mcp/http_client/client.rs:233 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tinyhumansai/openhuman@7491200858 (2026-08-17). Data as JSON: /api/errors/97faaec2f3562117. Report an issue: GitHub.