Requested wallet does not exist or is not loaded I need to perform rpc requests per wallet. Here is my url
http://127.0.0.1:18332/wallet/another_wallet/wallet.dat

but I get error  Requested wallet does not exist or is not loaded
I run daemon with this command
bitcoind -daemon -rpcuser=myrpc01 -rpcpassword=password01 -testnet -datadir=/media/ax/6f6ceb40-fbbc-4959-b2b2-dbb1ae9ce24a/bitcoin/testnet3

So what the wallet path I should set for correct load?
If you are trying to load a wallet, then you do not need to be using a wallet specific endpoint. loadwallet is not actually a wallet RPC so it does not need the wallet specific endpoint.
If you are trying to access a wallet that has already been loaded, then you have the wrong endpoint. The endpoint does not include the wallet.dat file. Bitcoin Core gives wallets names based on the directory that contains the wallet.dat file, and when it creates wallets, it puts them in directories of the name that was provided. The wallet RPC endpoints work similarly - they use just the wallet name. So the URL to access a particular wallet should actually be
http://127.0.0.1/18332/wallet/another_wallet

Note that this URL does not have a trailing slash (/). If you have a trailing slash, then Bitcoin Core will incorrectly determine the wallet name to be another_wallet/ where it is actually another_wallet.