[ask] about 301 Redirect

I think you shouldn't have to. If the web server and the web browser abide by the HTTP standard you'll never see that content. The redirect HTML is provided by web servers for very very old non-standard browsers.

The tool you are using is not behaving like a web browser would... or your web server is misconfigured... I am more inclined to blame the tool. It is probably making a single web request and wasn't programmed to follow redirects when they occur. It is a poorly written tool most likely.

So I think the correct answer is you shouldn't have to tune that HTML... if you insist on changing I think there is a directory on your server where the HTML templates reside. It is probably referenced in the one of the config files, but I don't think it is necessary for SEO. Pretty much no one tunes 301 response content. Google is bound to ignore it.

What you see there is NOT what matters to the search engines. That page appears to browsers who did not honor the redirect header, thus a "content" section is delivered. This is part of how HTTP works.

Ignore that page, it will not have any impact as far as keywords on redirects go, google's bots respect the redirect header ahd skip that page entirely.