Compressible Content-Type / mime checking.
$ npm install compressiblevarcompressible=require('compressible')Checks if the given Content-Type is compressible. The type argument is expected
to be a value MIME type or Content-Type string, though no validation is performed.
The MIME is looked up in the mime-db and
if there is compressible information in the database entry, that is returned. Otherwise,
this module will fallback to true for the following types:
text/**/*+json*/*+text*/*+xml
If this module is not sure if a type is specifically compressible or specifically
uncompressible, undefined is returned.
compressible('text/html')// => truecompressible('image/png')// => false