ruby-on-railsjsonrubyfaraday

Error Response not parsed by Faraday despite adding :json middleware

I initialize my Faraday client this way:

@client = Faraday.new(url: BASE_URL) do |faraday|
  faraday.request  :json
  faraday.response :json

  faraday.response :raise_error
end

And when I rescue the Faraday::ClientError, the response's body looks like this:

irb> e.response[:body]
"{\"error\":\"access_denied\",\"error_description\":\"Unauthorized\"}"

I would expect it to be parsed and have the body be a Hash. What am I doing wrong?

Solution

  • In Faraday, the order of registration of middlewares matters because it's a pipeline (similar to Rack).

    So if you put the :raise_error middleware before :json, the error's body will be parsed.

    @client = Faraday.new(url: BASE_URL) do |faraday|
  faraday.request  :json

  faraday.response :raise_error
  faraday.response :json
end