Custom error page not working for URL with '%' sign

I get the response with an error page as expected if an error occurs during request processing. However, if I try to perform the request with a '%' sign at the end (like http://localhost:8080/some-path%) I get a response like this:

<!doctype html>
<html lang="en">
  <head>
    <title>HTTP Status 400 – Bad Request</title>
    <style type="text/css">body {font-family:Tahoma,Arial,sans-serif;} h1, h2, h3, b {color:white;background-color:#525D76;} h1 {font-size:22px;} h2 {font-size:16px;} h3 {font-size:14px;} p {font-size:12px;} a {color:black;} .line {height:1px;background-color:#525D76;border:none;}</style>
  </head>
  <body>
    <h1>HTTP Status 400 – Bad Request</h1>
  </body>
</html>

Seems this is the default tomcat response. It is not overridden by custom response.

I am using Spring Boot v2.7.2 with web starter. Error controller:

@Controller
public class CustomErrorController implements ErrorController {
    @RequestMapping("/error")
    public String handleError() {
        return "error";
    }
}

aplication.yml:

spring:
  web:
    resources:
      add-mappings: false
  mvc:
    throw-exception-if-no-handler-found: true

server:
  error:
    path: /error
    whitelabel:
      enabled: false

spring-projects / spring-boot

Custom error page not working for URL with '%' sign #35668