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CDN-Loop Header filter config. See the :ref:`configuration overview <config_http_filters_cdn_loop>` for more information.
The CDN identifier to use for loop checks and to append to the CDN-Loop header. RFC 8586 calls this the cdn-id. The cdn-id can either be a pseudonym or hostname the CDN is in control of. cdn_id must not be empty.
The maximum allowed count of cdn_id in the downstream CDN-Loop request header. The default of 0 means a request can transit the CdnLoopFilter once. A value of 1 means that a request can transit the CdnLoopFilter twice and so on.