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The tools.ietf.org subdomain is being wound down and services are moving to datatracker.ietf.org. Links to RFC documents using the old subdomain are being redirected to datatracker; this updates the configured `rfc_base_url` to point to the current subdomain. Discussion: https://mailarchive.ietf.org/arch/msg/ietf/0n-6EXEmkTp3Uv_vj-5Vnm3o0bo/