How to change Apache Tomcat default error page values?

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I'm currently using a Spring Boot application I'm tinkering around the the error page and the messages given to it. Currently I can change the HTTP Status Number and Message, but I'm not sure how to change the "Unknown reason" or Description without changing it to something besides 418. Is there a way to customize those as well, or am I stuck with the embedded code provide?

Current Code Tinkering

for(String serialNo : serialNoList) {
    if(serialNo.length() < MIN_SERIALNO_SIZE ) {
        response.sendError(401, "Serial Number Length Exceeded: " + serialNo);
    }
    if(serialNo.length() > MAX_SERIALNO_SIZE) {
        response.sendError(403, "Serial Number Legth Too Short: " + serialNo);
    }
}

Error Page

spring-boot error-code java
1 Answers

First, you need to disable whiteLabel error pages.

server.error.whitelabel.enabled=false

or

// adding this on your main class 
@EnableAutoConfiguration(exclude = {ErrorMvcAutoConfiguration.class})

Now, create a html page (error.html), which you want to display and place it in resources/templates directory, it will be picked automatically.

To customize, differently for each error you can implement ErrorController.

@Controller
public class CustomErrorController implements ErrorController {
   
   // override this error path to custom error path
   @Override
   public String getErrorPath() {
    return "/custom-error";
   }

   @GetMapping("/custom-error")
   public String customHandling(HttpServletRequest request){
       // you can use request to get different error codes
       // request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE)

       // you can return different `view` based on error codes.
       // return 'error-404' or 'error-500' based on errors
   }
}
user_75836190
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