text: """Provide cors support for the HTTP component."""
  import asyncio
  
  from aiohttp.hdrs import ACCEPT, ORIGIN, CONTENT_TYPE
  
  from homeassistant.const import (
      HTTP_HEADER_X_REQUESTED_WITH, HTTP_HEADER_HA_AUTH)
  
  
  from homeassistant.core import callback
  
  
  ALLOWED_CORS_HEADERS = [
      ORIGIN, ACCEPT, HTTP_HEADER_X_REQUESTED_WITH, CONTENT_TYPE,
      HTTP_HEADER_HA_AUTH]
  
  
  @callback
  def setup_cors(app, origins):
      """Setup cors."""
      import aiohttp_cors
  
      cors = aiohttp_cors.setup(app, defaults={
          host: aiohttp_cors.ResourceOptions(
              allow_headers=ALLOWED_CORS_HEADERS,
              allow_methods='*',
          ) for host in origins
      })
  
      @asyncio.coroutine
      def cors_startup(app):
          """Initialize cors when app starts up."""
          cors_added = set()
  
          for route in list(app.router.routes()):
              if hasattr(route, 'resource'):
                  route = route.resource
              if route in cors_added:
                  continue
              cors.add(route)
              cors_added.add(route)
  
      app.on_startup.append(cors_startup)
  