Hello, I stumbled over your post about sending images from app to google cloud storage.
Yunnikong SoZai

Hey, the client is mostly doing a multipart form upload, you can find the details here in this spec about form upload, http://www.ietf.org/rfc/rfc1867.txt. For google cloud storage, one extra step needed is to get the upload URL from your AppEngine backend — after that it’s a simple multipart form upload

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