The Facebook Graph API now supports HTTP ETags. ETags support on the Facebook Platform can help you reduce bandwidth consumption and client-side overhead by suppressing output when making Graph API calls.
This is how it works:
1.When you make a Graph API call, the response header includes ETag with a value that is the hash of the data returned in the API call. Pull this ETag value and use in Step-2.
2.Next time you make the same API call, include the If-None-Match request header with ETag value pulled from step-1 for this API call.
3.If the data hasn’t changed, the response status code would be 304 – Not Modified and no data is returned.
4.If the data has changed since last pull, the data is returned as usual with a new ETag. Pull the new ETag value and use for subsequent calls.
Note: While ETags help reduce the data traffic, the If-None-Match GET will still count against the throttling limits for your app and must not be performed at a frequent rate. We recommend only do it for data that doesn’t change frequently like user’s friends, likes, photo albums, photos etc. Do not use it for news feed, messages etc.
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