[Bug-wget] An option to save error pages

[CCC DDD]

An option for wget to download content after non-200 HTTP code would be very 
useful.

For example, a HTTP/1.x 404 NOT FOUND response with nicely-formatted custom 
"404 page" HTML in the response body. Or a 502 error that generates a detailed 
page with diagnostic information. Additionally badly written php code will 
sometimes generate bogus 404 codes even though the content is available.

Most browsers will display this content to the user, but there is currently no 
way to make wget download it. As these pages often contain very useful 
information, it would be nice to have a "--save-even-if-error" option

Thank you