[[servlet-http]]
= HTTP

All HTTP based communication should be protected <<http,using TLS>>.

Below you can find details around Servlet specific features that assist with HTTPS usage.

[[servlet-http-redirect]]
== Redirect to HTTPS

If a client makes a request using HTTP rather than HTTPS, Spring Security can be configured to redirect to HTTPS.

For example, the following Java configuration will redirect any HTTP requests to HTTPS:

.Redirect to HTTPS
====
.Java
[source,java,role="primary"]
----
@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends
		WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) {
		http
			// ...
			.requiresChannel(channel -> channel
				.anyRequest().requiresSecure()
			);
	}
}
----

.Kotlin
[source,kotlin,role="secondary"]
----
@Configuration
@EnableWebSecurity
class SecurityConfig : WebSecurityConfigurerAdapter() {

    override fun configure(http: HttpSecurity) {
        http {
            // ...
            requiresChannel {
                secure(AnyRequestMatcher.INSTANCE, "REQUIRES_SECURE_CHANNEL")
            }
        }
    }
}
----
====

The following XML configuration will redirect all HTTP requests to HTTPS

.Redirect to HTTPS with XML Configuration
====
[source,xml]
----
<http>
	<intercept-url pattern="/**" access="ROLE_USER" requires-channel="https"/>
...
</http>
----
====


[[servlet-hsts]]
== Strict Transport Security

Spring Security provides support for <<servlet-headers-hsts,Strict Transport Security>> and enables it by default.

[[servlet-http-proxy-server]]
== Proxy Server Configuration

Spring Security <<http-proxy-server,integrates with proxy servers>>.
