Function getAttributionHeader

src/constants/system.ts:73–95

(fingerprint: string)

 * replacement avoids Content-Length changes and buffer reallocation.
 */
export function getAttributionHeader(fingerprint: string): string {
  if (!isAttributionHeaderEnabled()) {
    return ''
  }

  const version = `${MACRO.VERSION}.${fingerprint}`
  const entrypoint = process.env.CLAUDE_CODE_ENTRYPOINT ?? 'unknown'

  // cch=00000 placeholder is overwritten by Bun's HTTP stack with attestation token
  const cch = feature('NATIVE_CLIENT_ATTESTATION') ? ' cch=00000;' : ''
  // cc_workload: turn-scoped hint so the API can route e.g. cron-initiated
  // requests to a lower QoS pool. Absent = interactive default. Safe re:
  // fingerprint (computed from msg chars + version only, line 78 above) and
  // cch attestation (placeholder overwritten in serialized body bytes after
  // this string is built). Server _parse_cc_header tolerates unknown extra
  // fields so old API deploys silently ignore this.
  const workload = getWorkload()
  const workloadPair = workload ? ` cc_workload=${workload};` : ''
  const header = `x-anthropic-billing-header: cc_version=${version}; cc_entrypoint=${entrypoint};${cch}${workloadPair}`

  logForDebugging(`attribution header ${header}`)
  return header
}