dev-appserver

I 'm building an AppEngine application that stores data in Google Cloud Storage. I use the Google Cloud Storage Client (GCS) library as suggested. My app is working when deployed on AppEngine (reading/writing/listing objects) but I cannot make it work on the development server. The development server keeps returning error 404 and GCS raises NotFoundError. The dev-appserver is supposed to emulate the cloud storage functionality without any specific configurations etc. I see in the log files that the dev server is accepting requests at "/_ah/gcs" yet it seems that there is no handler for that

I'm developing a Google App Engine application and I am encountering references to both an App Engine SDK and a Cloud SDK . How do these two SDKs relate to each other? There is definitely some overlap between the two. There is a dev_appserver.py and appcfg.py is both of them. I can run a development server using dev_appserver.py , and also with gcloud preview app run . Why are there two tools that do the same thing? Is one being deprecated in favor of the other? Is there a roadmap for merging the toolsets, or are they going to be maintained in parallel? Do I need both, or just one? It seems