[[webflux-http]]
= HTTP

All HTTP based communication should be protected xref:overview/features/exploits/http.adoc#http[using TLS].

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

[[webflux-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"]
----
@Bean
SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http) {
	http
		// ...
		.redirectToHttps(withDefaults());
	return http.build();
}
----

.Kotlin
[source,kotlin,role="secondary"]
----
@Bean
fun springSecurityFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
    return http {
        // ...
        redirectToHttps { }
    }
}
----
====

The configuration can easily be wrapped around an if statement to only be turned on in production.
Alternatively, it can be enabled by looking for a property about the request that only happens in production.
For example, if the production environment adds a header named `X-Forwarded-Proto` the following Java Configuration could be used:

.Redirect to HTTPS when X-Forwarded
====
.Java
[source,java,role="primary"]
----
@Bean
SecurityWebFilterChain springSecurityFilterChain(ServerHttpSecurity http) {
	http
		// ...
		.redirectToHttps(redirect -> redirect
			.httpsRedirectWhen(e -> e.getRequest().getHeaders().containsKey("X-Forwarded-Proto"))
		);
	return http.build();
}
----

.Kotlin
[source,kotlin,role="secondary"]
----
@Bean
fun springSecurityFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
    return http {
        // ...
        redirectToHttps {
            httpsRedirectWhen {
                it.request.headers.containsKey("X-Forwarded-Proto")
            }
        }
    }
}
----
====

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

Spring Security provides support for xref:servlet/exploits/headers.adoc#servlet-headers-hsts[Strict Transport Security] and enables it by default.

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

Spring Security xref:overview/features/exploits/http.adoc#http-proxy-server[integrates with proxy servers].