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The allowlist determines which query services can be used for federated queries. This list is provided at runtime by mounting a newline-delimited text file of endpoints to /wdqs/allowlist.txt. It should include all instances hosted by Wikibase Cloud.
Example for allowlist.txt:
https://query.wikidata.org/bigdata/namespace/dcatap/sparql
https://query.wikidata.org/bigdata/namespace/wdq/sparql
https://query.wikidata.org/sparql