在Ruby 3.1.3和Faraday 2.7.5中，我永远无法从法拉第获得JSON响应：

def connection
      @connection ||= Faraday.new(
        url: url,
        headers: headers
      ) do |faraday|
        faraday.response :json
        faraday.request :json
      end
    end

    def headers
      { content_type: 'application/json',
        accept: 'application/json' }
    end

    def send_request
      connection.send(method) do |req|
        req.body = body
      end
    end

运行时，我检查了response.body，它从来不是JSON（即使我有faraday.response :json：

[1] pry(#<App>)> response.body
=> "{\"data\":{\"date\":\"some_data\"}}"

我必须：

[2] pry(#<>)> JSON.parse response.body
=> {"data"=>{"date"=>"some_data"}}

我正在检查的测试是：

let(:response_body) { { data: { date: 'some_data' } }.to_json }
 
 ...

stub_request(:post, url)
  .with(
     body: body.to_json,
     headers: custom_headers
   ).to_return(status: status, body: response_body, headers: {})
end

it 'POSTS to a url' do
  subject
  expect(a_request(:post, url)).to have_been_made
 end
end

是我的测试出错了，还是客户端代码总是返回json出错了？