Thymeleaf - th:method="delete/put" leads to: Request method 'POST' not supported

I use Spring Boot v2.7.0, installed from "start.spring.io" and from there I installed Thymeleaf, and as I searched in the parent-pom I found out that: thymeleaf-spring5 (v3.0.15.RELEASE), thymeleaf-extras-java8time (v3.0.4.RELEASE)

Lately, I needed to apply the pattern <form th:method="put/delete".../>. After googling in verious places, I found the solution, which was reffered in the book as well: "Taming Thymeleaf Practical Guide to building a web application with Spring Boot and Thymeleaf - Wim Deblauwe" which is the top/excellent books of Thymeleaf, and from which I learn Thymeleaf. Acoording to these, I did:

Step 1:

Added this property in application.properties:

spring.mvc.hiddenmethod.filter.enabled=true

and I tried it in the application.yaml (as a 2nd solution, because the previous did not work), like this way:

spring:
  mvc:
    hiddenmethod:
      filter:
        enabled: true

Step 2:

I used:

<form th:method="put".../>
<form th:method="delete".../>

Step 3:

Finally I used the: "@PutMapping, @DeleteMapping" in my controller handler methods.

The result was the error message:

There was an unexpected error (type=Method Not Allowed, status=405).
Request method 'POST' not supported
org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported
    at org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping.handleNoMatch(RequestMappingInfoHandlerMapping.java:253)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lookupHandlerMethod(AbstractHandlerMethodMapping.java:442)

After googling I found this solution, to add the needed bean by myself with the following way, which DID WORKED:

@Bean
public FilterRegistrationBean<HiddenHttpMethodFilter> hiddenHttpMethodFilter() {
    FilterRegistrationBean<HiddenHttpMethodFilter> filterRegistrationBean = new FilterRegistrationBean<>(new HiddenHttpMethodFilter());
    filterRegistrationBean.setUrlPatterns(Arrays.asList("/*"));
    return filterRegistrationBean;
}

I wonder why this configuration "spring.mvc.hiddenmethod.filter.enabled=true", does not add the needed bean in my case, and I have to add it by myself.

Anyone can help me on this, please? Thanks a lot in advance

import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.PutMapping; import org.springframework.web.bind.annotation.RequestMapping; @RequestMapping @Controller public class TestController { @GetMapping public String index(Model model) { model.addAttribute("formData", new TestFormData()); return "index"; } @PutMapping public String doPut(@ModelAttribute("formData") TestFormData formData) { System.out.println("formData.getSomeString() = " + formData.getSomeString()); return "redirect:/"; } }

public class TestFormData { private String someString; public String getSomeString() { return someString; } public void setSomeString(String someString) { this.someString = someString; } }

<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form th:action="@{/}" th:method="put" th:object="${formData}"> <input th:field="*{someString}"> <button>Save</button> </form> </body> </html>

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