Java_dev_appserver.cmd have a FLAGS can chang GOOGLE_STORAGE_KEY_PREFIX?

windows:

centos:

appengine-api-stubs2

appengine-api-stubs.jar need change "encoded_gs_key:" to "encoded_gs_key_"

https://cloud.google.com/appengine/docs/standard/java/tools/localunittesting/javadoc/constant-values.html?hl=zh-Cn#com.google.appengine.api.blobstore.dev.LocalBlobstoreService.GOOGLE_STORAGE_KEY_PREFIX

What does this have to do with App Inventor ?

Why are you sharing your API here ??