Retrieving Updated Contact Photo ETag

[Donald]

Upon completing an upload of a new contact photo, I'd like to be able to have access to a contact's new ETag identifier for the photo.  However, I'm finding that the response header only provides the previous ETag.  This is insufficient for my needs as I'd like to be able to detect when the Google photo changes later on by comparing the current ETag for the contact's photo to the previous one that I stored off.  Is there a way to get the new ETag in the response header?

Here's the response header for my test:

2012-12-24 09:37:44 +0000

Request: PUT https://www.google.com/m8/feeds/photos/media/xyz%40gmail.com/63cf85920b2e8473

Request headers:

  Accept: application/atom+xml, text/xml

  Authorization: GoogleLogin auth=_snip_

  Cache-Control: no-cache

  Content-Length: 25962

  Content-Type: image/jpeg

  GData-Version: 3.0

  If-Match: "LyxrbgohfCt7I2BJWEEIGApJEgEaH1wMbDc."

  Mime-Version: 1.0

  User-Agent: GData-ObjectiveC/1.12 iPhone/6.0.1 (gzip)

Request body: (25962 bytes)

<<25962 bytes>>

Response: status 200

Response headers:

  Cache-Control: private, max-age=0

  Content-Encoding: gzip

  Content-Type: application/atom+xml; charset=UTF-8; type=entry

  Date: Mon, 24 Dec 2012 09:37:44 GMT

  Etag: "LyxrbgohfCt7I2BJWEEIGApJEgEaH1wMbDc."

  Expires: Mon, 24 Dec 2012 09:37:44 GMT

  GData-Version: 3.1

  Server: GSE

  Transfer-Encoding: Identity

  X-Content-Type-Options: nosniff

  X-Frame-Options: SAMEORIGIN

  X-XSS-Protection: 1; mode=block

Response body: (700 bytes)

<?xml version='1.0' encoding='UTF-8'?><entry xmlns='http://www.w3.org/2005/Atom' xmlns:gd='http://schemas.google.com/g/2005' gd:etag='&quot;LyxrbgohfCt7I2BJWEEIGApJEgEaH1wMbDc.&quot;'><id>http://www.google.com/m8/feeds/photos/media/xyz%40gmail.com/63cf85920b2e8473</id><updated>2012-12-24T09:36:47.291Z</updated><app:edited xmlns:app='http://www.w3.org/2007/app'>2012-12-24T09:36:47.291Z</app:edited><link rel='self' type='application/atom+xml' href='https://www.google.com/m8/feeds/photos/media/xyz%40gmail.com/63cf85920b2e8473'/><link rel='edit' type='application/atom+xml' href='https://www.google.com/m8/feeds/photos/media/xyz%40gmail.com/63cf85920b2e8473'/></entry>

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[Greg Robbins]

You'll likely have to refetch the newly uploaded photo to get its ETag.

This isn't a question about use of the Objective-C library specifically, so it's more appropriate for the Contacts API discussion, which has been moved to StackOverflow:

https://groups.google.com/forum/embed/?place=topic%2Fgoogle-contacts-api%2FYmLAPHT6p8A%2Fdiscussion