Difference Between Custom 404 Error and Soft 404?

[sonvi.belani]

Hi,
Soft 404 errors is whene your site give 404 error without 404 http status code.
It can happened on old CMS systems(or unfriendly ones) that show thin\similar pages or show the homepage instead of 404 errors.

The difference is that normal 404 error gives back an http 404 status code, and soft 404 errors dont.

Thanks
sonvi.belani