BerriAI/litellm · error

failed to build reqwest client

Error message

failed to build reqwest client

What it means

Error "failed to build reqwest client" thrown in BerriAI/litellm.

Source

Thrown at litellm-rust/crates/ai-gateway/src/client.rs:12

use std::sync::OnceLock;
use std::time::Duration;

const HTTP_CLIENT_TIMEOUT_SECS: u64 = 600;

pub(crate) fn http_client() -> &'static reqwest::Client {
    static CLIENT: OnceLock<reqwest::Client> = OnceLock::new();
    CLIENT.get_or_init(|| {
        reqwest::Client::builder()
            .timeout(Duration::from_secs(HTTP_CLIENT_TIMEOUT_SECS))
            .build()
            .expect("failed to build reqwest client")
    })
}

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Check TLS/certificate configuration and system resources; reqwest client build usually fails on invalid TLS roots or missing CA certificates.

When it happens

Trigger: Thrown at litellm-rust/crates/ai-gateway/src/client.rs:12 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/072a48f89b18d4f9. Report an issue: GitHub.