WebTestClient can be configured with connector

Issue: SPR-16168

spring-test/src/main/java/org/springframework/test/web/reactive/server/DefaultWebTestClientBuilder.java

@@ -52,20 +52,28 @@ class DefaultWebTestClientBuilder implements WebTestClient.Builder {
 	private Duration responseTimeout;
 
 
+	/** Connect to server via Reactor Netty */
 	DefaultWebTestClientBuilder() {
-		this(null, null, new ReactorClientHttpConnector(), null);
+		this(new ReactorClientHttpConnector());
 	}
 
+	/** Connect to server through the given connector */
+	DefaultWebTestClientBuilder(ClientHttpConnector connector) {
+		this(null, null, connector, null);
+	}
+
+	/** Connect to given mock server with mock request and response */
 	DefaultWebTestClientBuilder(WebHttpHandlerBuilder httpHandlerBuilder) {
 		this(null, httpHandlerBuilder, null, null);
 	}
 
+	/** Copy constructor */
 	DefaultWebTestClientBuilder(DefaultWebTestClientBuilder other) {
 		this(other.webClientBuilder.clone(), other.httpHandlerBuilder, other.connector,
 				other.responseTimeout);
 	}
 
-	DefaultWebTestClientBuilder(@Nullable WebClient.Builder webClientBuilder,
+	private DefaultWebTestClientBuilder(@Nullable WebClient.Builder webClientBuilder,
 			@Nullable WebHttpHandlerBuilder httpHandlerBuilder, @Nullable ClientHttpConnector connector,
 			@Nullable Duration responseTimeout) {
 

spring-test/src/main/java/org/springframework/test/web/reactive/server/WebTestClient.java

@@ -33,6 +33,7 @@ import org.springframework.format.FormatterRegistry;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.MediaType;
+import org.springframework.http.client.reactive.ClientHttpConnector;
 import org.springframework.http.client.reactive.ClientHttpRequest;
 import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.util.MultiValueMap;
@@ -216,7 +217,8 @@ public interface WebTestClient {
 	}
 
 	/**
-	 * This server setup option allows you to connect to a running server.
+	 * This server setup option allows you to connect to a running server via
+	 * Reactor Netty.
 	 * <p><pre class="code">
 	 * WebTestClient client = WebTestClient.bindToServer()
 	 *         .baseUrl("http://localhost:8080")
@@ -228,6 +230,20 @@ public interface WebTestClient {
 		return new DefaultWebTestClientBuilder();
 	}
 
+	/**
+	 * A variant of {@link #bindToServer()} with a pre-configured connector.
+	 * <p><pre class="code">
+	 * WebTestClient client = WebTestClient.bindToServer()
+	 *         .baseUrl("http://localhost:8080")
+	 *         .build();
+	 * </pre>
+	 * @return chained API to customize client config
+	 * @since 5.0.2
+	 */
+	static Builder bindToServer(ClientHttpConnector connector) {
+		return new DefaultWebTestClientBuilder(connector);
+	}
+
 
 	/**
 	 * Base specification for setting up tests without a server.