fetch patch request is not allowed

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I had a very similar problem with reactJS front end and rails API using Rack::Cors, and adding patch to the list of allowed methods solved the problem for me.

config.middleware.insert_before 0, Rack::Cors do
  allow do
    origins '*'
    resource '*', headers: :any, methods: [:get, :post, :patch, :options]
  end
end

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