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29 lines
1.3 KiB
29 lines
1.3 KiB
The Windshaft-CartoDB MultiLayer API extends the [Windshaft MultiLayer API](https://github.com/CartoDB/Windshaft/blob/master/doc/Multilayer-API.md) in a few ways.
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## Last modification timestamp embedded in the token
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It encodes a timestamp of 'last modification time' into the map token (token:EPOCH) returned to the client.
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It accepts tokens with encoded timestamp from the client considering the token suffix as a cache_buster value.
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Clients don't need to be aware of the extension but rather use the API as they would use the base one.
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The only difference will be that the _same_ layergroup configuration may result in different tokens if source data was modified between the mapview requests.
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## Additional attributes in the response object
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Windshaft-CartoDB adds the following attributes in the response object
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- ``last_update`` field with ISO format (2013-11-30T12:23:10).
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- ``cdn_url`` object containing CDN url client should use (not mandatory) to access the tiles. It's in the form:
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```json
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{
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"http": "http://cdn_url.com/",
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"https": "https://secure.cdn_url.com/"
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}
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```
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## Stats tag
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Windshaft-CartoDB adds support for a ``stat_tag`` element in the multilayer configuration to help [stats](https://github.com/CartoDB/Windshaft-cartodb/wiki/Redis-stats-format) gathering.
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