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mask

Image mask. Requests the mask (alpha channel) data.
req=mask
Supports the same commands as req=img , and is processed the same way by the server, but instead of returning the RGB or RGBA data, the server discards the color information and returns only the mask (alpha channel) data. The reply data format and response MIME type are determined by fmt= .
The HTTP response is cacheable with the TTL based on catalog::Expiration .