config/src/main/java/org/springframework/security/config/annotation/web/configuration/WebSecurityConfigurerAdapter.java
@SuppressWarnings({ "rawtypes", "unchecked" })
	protected final HttpSecurity getHttp() throws Exception {
		if (http != null) {
			return http;
		}

		DefaultAuthenticationEventPublisher eventPublisher = objectPostProcessor
				.postProcess(new DefaultAuthenticationEventPublisher());
		localConfigureAuthenticationBldr.authenticationEventPublisher(eventPublisher);

		AuthenticationManager authenticationManager = authenticationManager();
		authenticationBuilder.parentAuthenticationManager(authenticationManager);
		authenticationBuilder.authenticationEventPublisher(eventPublisher);
		Map<Class<? extends Object>, Object> sharedObjects = createSharedObjects();

		http = new HttpSecurity(objectPostProcessor, authenticationBuilder,
				sharedObjects);
		if (!disableDefaults) {
			// @formatter:off
			http
				.csrf().and()
				.addFilter(new WebAsyncManagerIntegrationFilter())
				.exceptionHandling().and()
				.headers().and()
				.sessionManagement().and()
				.securityContext().and()
				.requestCache().and()
				.anonymous().and()
				.servletApi().and()
				.apply(new DefaultLoginPageConfigurer<>()).and()
				.logout();
			// @formatter:on
			ClassLoader classLoader = this.context.getClassLoader();
			List<AbstractHttpConfigurer> defaultHttpConfigurers =
					SpringFactoriesLoader.loadFactories(AbstractHttpConfigurer.class, classLoader);

			for (AbstractHttpConfigurer configurer : defaultHttpConfigurers) {
				http.apply(configurer);
			}
		}
		configure(http);
		return http;
	}
@SuppressWarnings({ "rawtypes", "unchecked" })
	protected final HttpSecurity getHttp() throws Exception {
		if (http != null) {
			return http;
		}

		DefaultAuthenticationEventPublisher eventPublisher = objectPostProcessor
				.postProcess(new DefaultAuthenticationEventPublisher());
		localConfigureAuthenticationBldr.authenticationEventPublisher(eventPublisher);

		AuthenticationManager authenticationManager = authenticationManager();
		authenticationBuilder.parentAuthenticationManager(authenticationManager);
		authenticationBuilder.authenticationEventPublisher(eventPublisher);
		Map<Class<? extends Object>, Object> sharedObjects = createSharedObjects();

		http = new HttpSecurity(objectPostProcessor, authenticationBuilder,
				sharedObjects);
		if (!disableDefaults) {
			// @formatter:off
			http
				.csrf().and()
				.addFilter(new WebAsyncManagerIntegrationFilter())
				.exceptionHandling().and()
				.headers().and()
				.sessionManagement().and()
				.securityContext().and()
				.requestCache().and()
				.anonymous().and()
				.servletApi().and()
				.apply(new DefaultLoginPageConfigurer<>()).and()
				.logout();
			// @formatter:on
			ClassLoader classLoader = this.context.getClassLoader();
			List<AbstractHttpConfigurer> defaultHttpConfigurers =
					SpringFactoriesLoader.loadFactories(AbstractHttpConfigurer.class, classLoader);

			for (AbstractHttpConfigurer configurer : defaultHttpConfigurers) {
				http.apply(configurer);
			}
		}
		configure(http);
		return http;
	}
Creates the {@link HttpSecurity} or returns the current instance

] * @return the {@link HttpSecurity}
@throws Exception