Authorization could fail

[hexydec]

The specification implemented in the method CosmosDb::getAuthHeaders() requires that the resourceLink remains case-sensitive, whereas your code incorrectly lowercases the whole siganature string. If the resource you are trying to access has uppercase characters in it, the authorization will likely fail.

See: https://learn.microsoft.com/en-us/rest/api/cosmos-db/access-control-on-cosmosdb-resources?redirectedfrom=MSDN