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I am trying to use the If-Modified-Since header with SObject Describe https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/describe_global_with_ifmodified_header.htm

I want to know if the contact object's metadata has been modified since the specified date. I am using the Workbench REST Explorer.

My Request Header is

Content-Type: application/json; charset=UTF-8
Accept: application/json
If-Modified-Since: Sat, 29 Jul 2017 00:00:00 GMT

and endpoint is

/services/data/v39.0/sobjects/contact/describe

I have not made any changes to contact metadata but it is still returning metadata for contact instead of HTTP/1.1 304 Not Modified status code.

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From Salesforce Documentation:

If-Modified-Since:

The If-Modified-Since header is a time-based request header. The request is processed only if the data has changed since the date and time specified in the header. Otherwise, a 304 Not Modified status code is returned, and the request isn’t processed.

Here is the link - https://developer.salesforce.com/docs/atlas.en-us.api_rest.meta/api_rest/intro_rest_conditional_requests.htm

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