```ruby
# ApiClient::Parser provides a method to parse the request response.
module ApiClient::Parser
  # Parse the JSON response.
  #
  # @param [HTTP] response HTTP object for the request.
  # @return [Array] the code and the body parsed.
  def self.response(response)
    raise_exception(response.code)
    begin
      object = JSON.parse(response.body)
    rescue JSON::ParserError, TypeError
      object = {}
    end
    object
  end

  protected

  def self.raise_exception(code)
    case code.to_i
      when 401 then raise ApiClient::Exceptions::Unauthorized
      when 403 then raise ApiClient::Exceptions::Forbidden
      when 404 then raise ApiClient::Exceptions::NotFound
      when 500 then raise ApiClient::Exceptions::InternalServerError
      when 502 then raise ApiClient::Exceptions::BadGateway
      when 503 then raise ApiClient::Exceptions::ServiceUnavailable
      else return
    end
  end
end
```

Fix for 'uninitialized constant JSON (NameError)'
user
```ruby
require 'json'

# ApiClient::Parser provides a method to parse the request response.
module ApiClient::Parser
  # Parse the JSON response.
  #
  # @param [HTTP] response HTTP object for the request.
  # @return [Array] the code and the body parsed.
  def self.response(response)
    raise_exception(response.code)
    begin
      object = ::JSON.parse(response.body)
    rescue ::JSON::ParserError, TypeError
      object = {}
    end
    object
  end

  protected

  def self.raise_exception(code)
    case code.to_i
      when 401 then raise ApiClient::Exceptions::Unauthorized
      when 403 then raise ApiClient::Exceptions::Forbidden
      when 404 then raise ApiClient::Exceptions::NotFound
      when 500 then raise ApiClient::Exceptions::InternalServerError
      when 502 then raise ApiClient::Exceptions::BadGateway
      when 503 then raise ApiClient::Exceptions::ServiceUnavailable
      else return
    end
  end
end
```
assistant