Perl CGI "400 Bad Request" - not coming as json instead response type is html

Question

When try to return the JSON response with status code "400 Bad Request", perl cgi always responding with text/html where as for 200, its returning JSON data correctly.

Using apache server.

Answer 1

It got worked after use Apache2::RequestUtil->request->rflush;

Thanks for the How to suppress the default mod_perl error page in legacy CGI script using ModPerl::Registry