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Image data is returned if a request successfully completes, and if the request either does not include a req= command, or if req=img or req=tmb.
The HTTP response MIME type is determined by fmt= , or, if fmt= is not specified, it is <image/jpeg> .
The HTTP response status is '200 OK' if the request method was an unconditional GET or HEAD .
The server may reply with status '304' (not modified) and not return any image data in response to a conditional GET request (which includes a valid If-Modified-Since or If-None-Match header).