NFT Contract Images are not Showing Up

I’ve deployed an NFT contract on Avalanche network and successfully verified it on cchain explorer. You may see the contract here.
Now my problem is, when I click the metadata instance of the contract Here, it returns with an error {status: "fail"} , which I normally send from my api when there is no token like this with status code 200.
The web API address that returns from NFT’s tokenURI function for let’s say token id 100 is
I know that avalanche cchain explorer application is a blockscout instance. I’ve look at the blockscout code in instance_metadata_retriever.ex and there are some fetching operations, but I couldn’t find which one is failing.

Thanks in advance !