How do you configure basic authentication?

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Basic Authentication is a simple authentication mechanism where the client sends a username and password with every request, encoded in Base64, using the Authorization HTTP header. Though easy to set up, it is recommended only over HTTPS to prevent credentials from being exposed.

In Spring Security, you can configure Basic Authentication in several ways:

Using Java Configuration (Spring Boot 2.x & above)

@Configuration

@EnableWebSecurity

public class SecurityConfig {

   @Bean

   public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {

      http.csrf().disable()

          .authorizeHttpRequests()

          .requestMatchers("/api/public").permitAll()

          .anyRequest().authenticated()

          .and()

          .httpBasic();   // enables Basic Authentication

      return http.build();

   }

}

Defining In-Memory Users

@Bean

public UserDetailsService users() {

   UserDetails user = User.withUsername("admin")

                          .password("{noop}password") // {noop} = no encoding

                          .roles("USER")

                          .build();

   return new InMemoryUserDetailsManager(user);

}

Request Example

The client sends a header like:

Authorization: Basic YWRtaW46cGFzc3dvcmQ=

(where the value is Base64 encoded username:password).

Summary: Basic Auth is simple and quick to configure in Spring Security but should always be secured with HTTPS or replaced by stronger mechanisms like JWT or OAuth2 in production.

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