custom_middleware.rb

require 'desk_api'
require 'json'

site = {
  username: 'you@example.com',
  password: 'yourpassword',
  site_name: 'yoursubdomain'
}

client = DeskApi::Client.new username: site[:username], password: site[:password], subdomain: site[:site_name]
client.middleware = Proc.new do |builder|
  builder.request :json
  builder.request :basic_auth, site[:username], site[:password]
  builder.request :retry

  builder.response :mashify
  builder.response :dates
  # remove raising of errors
  # builder.response :raise_error, DeskApi::Error::ClientError
  # builder.response :raise_error, DeskApi::Error::ServerError
  builder.response :json, content_type: /application\/json/
  # add a request/response logger
  builder.response :logger

  builder.adapter Faraday.default_adapter
end

resp = client.get('/api/v2/cases/:a_non_existent_id')

puts resp.body.to_json
# {"message":"Resource Not Found"}
puts resp.headers.to_json
# {"accept-ranges"=>"bytes", "cache-control"=>"no-cache, private", "content-type"=>"application/json; charset=utf-8", "date"=>"Tue, 12 Nov 2013 22:58:54 GMT", "status"=>"404 Not Found", "vary"=>"X-AppVersion", "x-appversion"=>"13.9", "x-frame-options"=>"SAMEORIGIN", "x-rate-limit-limit"=>"60", "x-rate-limit-remaining"=>"59", "x-rate-limit-reset"=>"6", "x-request-id"=>"084842f889484a4bf07c2618284383f2", "content-length"=>"32", "connection"=>"Close"}