Spring security custom login page authentication succeeds but error 405 is reported

This article mainly records the errors and solutions I encountered in my study

1 environment

springboot + thymeleaf + spring security

2 errors

This page appears, but the authentication has indeed been successful

3 Related code

3.1 security configuration class

Insert code snippet here
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class NewSevurityConfig extends WebSecurityConfigurerAdapter {
	
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        
        // Custom login page
        http.formLogin()
				.loginPage("/toLogin")
                .usernameParameter("username")
                .passwordParameter("password")
				.loginProcessingUrl("/login")
                .successForwardUrl("/");

    }
	
	// Other configuration omitted
}

3.2 Main front-end code

<div>
    <form th:action="@{/login}" method="post">
        username<input type="text" name="username">
                 password<input type="password" name="password">
        <button type="submit" >log in</button>
    </form>
</div>

4 Solution

After checking, the error is in successForwardUrl(“/”) in 3.1
Replace with defaultSuccessUrl(“/”)

// Custom login page
        http.formLogin()
				.loginPage("/toLogin")
                .usernameParameter("username")
                .passwordParameter("password")
				.loginProcessingUrl("/login")
                .defaultSuccessUrl("/"); //Replace successForwardUrl here with defaultSuccessUrl
                

5 Cause of error

The cause of the error is temporarily unclear. Due to time, it is temporarily recorded. We will learn more about the cause of the problem later.

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