ruby on rails - OmniAuth::NoSessionError - You must provide a session to use OmniAuth. (configured in devise) -

hi learning how use omniauth backend ember app.

when run application below mentioned erroe omniauth::nosessionerror - must provide session use omniauth

on resue rails s applicataion halts @ line below.

  172: def call!(env) # rubocop:disable cyclomaticcomplexity     173:   unless env['rack.session']     174:     error = omniauth::nosessionerror.new('you must provide session use omniauth.')  => 175:     fail(error)     176:   end     177:  

config/intializer/devise

devise.setup |config|    config.mailer_sender = 'please-change-me-at-config-initializers-devise@example.com'   require 'devise/orm/active_record'   config.case_insensitive_keys = [ :email ]   config.strip_whitespace_keys = [ :email ]   config.http_authenticatable = true   config.skip_session_storage = [:http_auth]   config.stretches = rails.env.test? ? 1 : 10   config.reconfirmable = true   config.expire_all_remember_me_on_sign_out = true   config.password_length = 8..128   config.reset_password_within = 6.hours   config.http_authenticatable_on_xhr = false   config.navigational_formats = ['*/*', :html,:json]   config.sign_out_via = :delete   require 'omniauth-facebook'   config.omniauth :facebook, env['8987087080'] , env['3d6a359a37c8780870dxxxx5'],:strategy_class => omniauth::strategies::facebook end 

config/intializer/session_store.rb

rails.application.config.session_store :disabled 

routes.rb

rails.application.routes.draw    namespace :api     namespace :v1       resources :users       resources :games     end   end    activeadmin.routes(self)   #devise_for :admin_users, activeadmin::devise.config   devise_for :users, controllers: {      omniauth_callbacks: 'omniauth_callbacks',     sessions: 'sessions' ,      registrations: "registrations",     }    devise_scope :user      match 'users/sign_in', to: 'sessions#create', via: :post     match 'api/v1/users' , to: 'registrations#create' , via: :post   end  end 

gemfile.rb

source 'https://rubygems.org'  # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.6'  platforms :ruby # linux   gem 'unicorn'   gem 'foreman'   gem 'delayed_job_active_record' end group :development, :test     gem 'compass'     gem 'pry'     gem 'pry-remote'     gem 'pry-rails'     gem 'pry-rescue'     gem 'pry-stack_explorer'     gem 'pry-byebug'     gem 'guard'     gem 'guard-livereload'     gem 'guard-rails'     gem 'guard-rspec'     gem 'guard-cucumber'     gem 'guard-zeus'     gem 'rspec-rails'  end group :production     #gem 'pg' end  #authentication gem 'cancan' gem 'rolify' gem 'devise' gem 'omniauth' gem 'omniauth-facebook', '=1.4.0' gem 'oauth2'    # use scss stylesheets gem 'sass-rails', '~> 4.0.0' gem 'bootstrap-sass', '~> 3.1.1' gem 'bootswatch-rails'  # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0'    # see https://github.com/sstephenson/execjs#readme more supported runtimes # gem 'therubyracer', platforms: :ruby  # use jquery javascript library gem 'jquery-rails'   group :doc   # bundle exec rake doc:rails generates api under doc/api.   gem 'sdoc', require: false end  #ember gem "active_model_serializers" gem "ember-source", "~>1.7.0"  #asyc http calls gem 'hashie_rails' gem "typhoeus" gem "virtus"  #middleware gem "rack-cors", require: 'rack/cors'    platforms :mswin    gem "wdm", :group => [:development, :test] end #gem 'wdm', '>= 0.1.0'  # windows not include zoneinfo files, bundle tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin] 

it because disabled session middleware (look @ output of rake middleware). omniauth not work without session middleware.

you disabled here: rails.application.config.session_store :disabled

if trying ditch session because not use other omniauth, thing can write own middleware injects actiondispatch::session::cookiestore , possibly other necessary middlewares based on url (i.e. if url /auth/*). here example of use achieve (only uses session if url path not /api/...):

# /config/application.rb config.middleware.insert_before actiondispatch::paramsparser, "selectivestack"  # /config/initializers/omniauth.rb ::omniauthconfig = proc.new   provider :github, # ... end  # /app/middleware/selective_stack.rb class selectivestack   def initialize(app)     @app = app   end    def call(env)     if env["path_info"].start_with?("/api/") # <--- change url path here       @app.call(env)     else       middleware_stack.build(@app).call(env)     end   end  private   def middleware_stack     @middleware_stack ||= begin       actiondispatch::middlewarestack.new.tap |middleware|         # needed omniauth         middleware.use actiondispatch::cookies         middleware.use rails.application.config.session_store, rails.application.config.session_options         middleware.use omniauth::builder, &omniauthconfig         # needed doorkeeper /oauth views         middleware.use actiondispatch::flash       end     end   end end 

in example enable session middleware when url not start /api/. will still need remove rails.application.config.session_store :disabled , set session store, of course. in example use cookie store. might need tweak example based on middleware missing in rake middleware. if you're not doing performance reasons reenable session middleware.