Force.com REST API Developer's Guide

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Get Object Metadata Changes

Use the SObject Describe resource and the If-Modified-Since HTTP header to determine if object metadata has changed.

If an If-Modified-Since header is provided, along with a date in EEE, dd MMM yyyy HH:mm:ss z format, in an SObject Describe request, response metadata will only be returned if the object metadata has changed since the provided date. If the metadata has not been modified since the provided date, a 304 Not Modified status code is returned, with no response body.

The following example assumes that no changes, such as new custom fields, have been made to the Merchandise__c object after July 3rd, 2013.

Example SObject Describe request
/services/data/v29.0/sobjects/Merchandise__c/describe
Example If-Modified-Since header used with request
If-Modified-Since: Wed, 3 Jul 2013 19:43:31 GMT
Example response body
No response body returned
Example response status code
1HTTP/1.1 304 Not Modified
2Date: Fri, 12 Jul 2013 05:03:24 GMT

If there were changes to Merchandise__c made after July 3rd, 2013, the response body would contain the metadata for Merchandise__c. See Get Field and Other Metadata for an Object for an example.