This has been moved to: https://www.cmegroup.com/confluence/display/EPICSANDBOX/CME+Reference+Data+API+Version+2
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Reference Data API Version 1 - End of Life December 31, 2020
This version of CME Reference Data API will be decommissioned on December 31, 2020. Please use Reference Data API Version 2 documentation for development to CME Reference Data API.