Directly Putting Data in AppEngine's Blobstore

Question

The AppEngine's standard API assumes files are uploaded from an HTML form. I'm trying to post a file to the blobstore from a REST API method that can be called by a non Html client (Flash, iPhone, etc.)

The code I'm trying to get working:

# Get the blobstore upload url    
upload_url = blobstore.create_upload_url("/activities/upload_finished");

# Make sync call to the blobstore url to post our image
result = urlfetch.fetch(url=upload_url,
                        payload=request.FILES,
                        method=urlfetch.POST,
                        headers={'Content-Type': 'multipart/form-data'})

I'm getting the following error:

ValueError: Invalid boundary in

Any idea?
Has anyone tried posting to the blobstore not through a web form?

multipart form: ''

Crinkumcrankum

Answer 1

App Engine (version 1.4.3) allows you to directly write data to the blobstore.
You no longer need to use the upload url method.

Indore

right, please notice hat this feature is marked as Experimental (don't know what does it mean) – Denti

@Yonatan It means "Don't come crying if it doesn't work and break your site" :) and also "We might change the API until final relase" – Indore

looks like it's deprecated now – Gush

Answer 2

You can't make a regular post into a multipart form simply by specifying the content type - you're just submitting URL-encoded data with the wrong content type.

You'll need to assemble a proper multipart form - using the email module or by hand, like this.

Also see this question.

Restriction