Add the content length to WSGI input reading
Add the content length to WSGI input reading

This is required to stop the input from being indefinitely read, and
thereby blocking the response

knesenko/marathon-lb,vixns/marathon-lb,GrovoLearning/marathon-lb,mesosphere/marathon-lb,knesenko/marathon-lb,vixns/marathon-lb,JamesAwesome/marathon-lb,GrovoLearning/marathon-lb,JamesAwesome/marathon-lb,mesosphere/marathon-lb,matt-deboer/marathon-lb,GrovoLearning/marathon-lb,knesenko/marathon-lb,JamesAwesome/marathon-lb,vixns/marathon-lb,matt-deboer/marathon-lb,matt-deboer/marathon-lb,mesosphere/marathon-lb