I'd like to have Fastly serve as a mid-tier CDN cache, which includes re-validating signed URLs already validated by other CDNs at the edge. One of the CDNs we're using has an URL-signing scheme that uses a hex-encoded URL signature. The signature must be decoded at Fastly to perform validation.
Fastly doesn't appear to include VCL functions to hex-decode strings. Does anyone have recommendations for how to accomplish this? Is there something akin to the 'decode' function in 'vmod.blob'?
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