The open tezos docs suggest using RPC URL: "https://florencenet.smartpy.io/". It does not work.
What alternatives RPC URLs do you use. It seems that when you use the mainnet RPC URL - things tend to work. Any others for testing.
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florencenet is a dead testing network, that's why it doesn't work. You need to use a current testing network RPC. The current testing network mimicking mainnet is
If you want to test the next protocol, use
This RPC node also works well https://hangzhounet.api.tez.ie/