Regarding 'If-modified-since' header support in Smartthings Cloud rest api

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I don’t know, but I wouldn’t find it at all remarkable if it isn’t.

In the API reference, you can see which parameters you can use to “filter” the results from the API. For example:
To list the devices, you can include:

I’ll try to get more details about those headers from the engineering team.

Sure Thank you, It would be great, if I know whether the headers are supported or not.