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access failed
i run three blockchain.py in port 5000 50001 5002 in three terminal, i can acesss the http://127.0.0.1:5000/chain, and it works. However, the http://127.0.0.1:50001/chain and http://127.0.0.1:5002/chain, i failed by "AttributeError:'Request' object has no attribute' is_xhr", why?