Function preconnectAnthropicApi

src/utils/apiPreconnect.ts:32–72

()

let fired = false

export function preconnectAnthropicApi(): void {
  if (fired) return
  fired = true

  // Skip if using a cloud provider - different endpoint + auth
  if (
    isEnvTruthy(process.env.CLAUDE_CODE_USE_BEDROCK) ||
    isEnvTruthy(process.env.CLAUDE_CODE_USE_VERTEX) ||
    isEnvTruthy(process.env.CLAUDE_CODE_USE_FOUNDRY)
  ) {
    return
  }
  // Skip if proxy/mTLS/unix - SDK's custom dispatcher won't reuse this pool
  if (
    process.env.HTTPS_PROXY ||
    process.env.https_proxy ||
    process.env.HTTP_PROXY ||
    process.env.http_proxy ||
    process.env.ANTHROPIC_UNIX_SOCKET ||
    process.env.CLAUDE_CODE_CLIENT_CERT ||
    process.env.CLAUDE_CODE_CLIENT_KEY
  ) {
    return
  }

  // Use the configured first-party inference URL override when present,
  // otherwise fall back to the OAuth-configured default host.
  // NODE_EXTRA_CA_CERTS no longer a skip - init.ts applied it before this fires.
  const baseUrl =
    getFirstPartyBaseUrlOverride() || getDefaultFirstPartyInferenceBaseUrl()

  // Fire and forget. HEAD means no response body - the connection is eligible
  // for keep-alive pool reuse immediately after headers arrive. 10s timeout
  // so a slow network doesn't hang the process; abort is fine since the real
  // request will handshake fresh if needed.
  // eslint-disable-next-line eslint-plugin-n/no-unsupported-features/node-builtins
  void fetch(baseUrl, {
    method: 'HEAD',
    signal: AbortSignal.timeout(10_000),
  }).catch(() => {})
}