当我尝试从我的API获取资源时，我得到了一个无效的授权。
invalid_grant: The provided authorization grant is invalid, expired, revoked, does not match the redirection URI used in the authorization request,or was issued to another client.
这可能是什么问题呢？

require 'sinatra'
  require 'httparty'
  require 'oauth2'

  enable :sessions

  configure do
    set :callback, 'http://localhost:4567/auth/doorkeeper/callback'
    set :app_id, '7cd423ef68bdc938372d8e290475ea5a85feb550004b77481f99ff0dcba133b1'
    set :app_secret, '46bafd07b5a485240d7fdaedbdbac2a675afabe470f5433b13395f8dcff4e473'
  end

  get '/' do
    oauth_client.auth_code.authorize_url(redirect_uri: settings.callback)
  end

  get '/auth/doorkeeper/callback' do
    if params[:code].nil?
      redirect to('/')
    end

    session[:code] = params[:code]

    redirect to('/get_token')
  end

  get '/get_token' do
    access = oauth_client.auth_code.get_token session[:code], :redirect_uri => settings.callback
    # session[:code]
    access.get('/api/v1/me')
  end

  def oauth_client
    @oauth_client ||= OAuth2::Client.new(settings.app_id, settings.app_secret, site: "http://localhost:3000")
  end