AEM adds ‘.html’ to the Redirect URL of Internal Pages

Description

AEM adds .html to URL fragment (or anchor, the last part of URL staring from #). For example:
/content/we-retail/us/en/men.html#FEATURED - /content/we-retail/us/en/men.html#FEATURED.html

Steps to reproduce:
1-Create a new content page page1 under /content/we-retail.
2-Select page1  Properties.
3-In Advanced tab  'Redirect' field, set '/content/we-retail/us/en/men.html#FEATURED'.
4-Access page1 with 'View as Published'.
$  curl -v -u admin:admin http://localhost:6402/content/we-retail/page1.html?wcmmode=disabled
* About to connect() to localhost port 6402 (#0)
...
HTTP/1.1 302 Found
Date: Mon, 29 Jun 2020 08:21:19 GMT
X-Content-Type-Options: nosniff
Content-Type: text/html;charset=utf-8
Location: http://localhost:6402/content/we-retail/us/en/men.html#FEATURED.html?wcmmode=disabled
Content-Length: 0
* Connection #0 to host localhost left intact

Resolution

This is a hard-coded behaviour. The 'com.day.cq.wcm.foundation.impl.PageRedirectServlet#doGet' is adding '.html' to the redirect URL if the redirect target is a space within the same AEM.

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