Add SSL bundle support to WebClient auto-configuration

Introduce `WebClientSsl` interface and auto-configuration to allow a
WebClient builder to have custom SSL configuration applied.

The previous `ClientHttpConnectorConfiguration` has been been changed
to now create `ClientHttpConnectorFactory` instances which can be used
directly or by `AutoConfiguredWebClientSsl`.

Closes gh-18556

spring-boot-project/spring-boot-docs/src/docs/asciidoc/io/rest-client.adoc

@@ -90,3 +90,16 @@ To make an application-wide, additive customization to all `WebClient.Builder` i
 
 Finally, you can fall back to the original API and use `WebClient.create()`.
 In that case, no auto-configuration or `WebClientCustomizer` is applied.
+
+
+
+[[io.rest-client.webclient.ssl]]
+==== WebClient SSL Support
+If you need custom SSL configuration on the `ClientHttpConnector` used by the `WebClient`, you can inject a `WebClientSsl` instance that can be used with the builder's `apply` method.
+
+The `WebClientSsl` interface provides access to any <<features#features.ssl.bundles,SSL bundles>> that you have defined in your `application.properties` or `application.yaml` file.
+
+The following code shows a typical example:
+
+include::code:MyService[]
+

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/webclient/ssl/MyService.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.webclient.ssl;
+
+import org.neo4j.cypherdsl.core.Relationship.Details;
+import reactor.core.publisher.Mono;
+
+import org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientSsl;
+import org.springframework.stereotype.Service;
+import org.springframework.web.reactive.function.client.WebClient;
+
+@Service
+public class MyService {
+
+	private final WebClient webClient;
+
+	public MyService(WebClient.Builder webClientBuilder, WebClientSsl ssl) {
+		this.webClient = webClientBuilder.baseUrl("https://example.org").apply(ssl.fromBundle("mybundle")).build();
+	}
+
+	public Mono<Details> someRestCall(String name) {
+		return this.webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(Details.class);
+	}
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/webclient/ssl/MyService.kt

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.webclient.ssl
+
+import org.neo4j.cypherdsl.core.Relationship
+import org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientSsl
+import org.springframework.stereotype.Service
+import org.springframework.web.reactive.function.client.WebClient
+import reactor.core.publisher.Mono
+
+@Service
+class MyService(webClientBuilder: WebClient.Builder, ssl: WebClientSsl) {
+
+	private val webClient: WebClient
+
+	init {
+		webClient = webClientBuilder.baseUrl("https://example.org").apply(ssl.fromBundle("mybundle")).build()
+	}
+
+	fun someRestCall(name: String?): Mono<Relationship.Details> {
+		return webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(
+			Relationship.Details::class.java
+		)
+	}
+
+}
+