This issue is with only Android browser as it does not support ‘.manifest’ extension without having MIME type configuration in the hosted server.
Therefore, tried out adding ‘.manifest’ as one of the MIME types, but this was failed as it does not support as a MIME type which is already attached with another reference.
Adding ‘.appcache’ or ‘apache’ was made it functional.
<mimeMapfileExtension=".apache"mimeType="text/cache-manifest" />
(source: Load cache manifest file)