old_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
          url(r'^$', views.MainPage.as_view(), name='index'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/$', views.SessionPage.as_view(), 
              name='Session'),
          url(r'^GlobalMap/$', views.GlobalMap.as_view(), 
              name='GlobalMap'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/Map$', views.MapPage.as_view(), 
              name='Map'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/download$', views.download_file, 
              name='ses_down'),
  ]
  
new_contents: from django.conf.urls import url
  
  from . import views
  
  urlpatterns = [
          url(r'^$', views.MainPage.as_view(), name='index'),
          url(r'^GlobalMap/$', views.GlobalMap.as_view(), 
              name='GlobalMap'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/$', views.SessionPage.as_view(), 
              name='Session'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/Map$', views.MapPage.as_view(), 
              name='Map'),
          url(r'^(?P<ses_id>[a-zA-Z0-9]+)/download$', views.download_file, 
              name='ses_down'),
  ]
  
subject: Move global map url before session url.