Add HTTP Service registry support

See gh-33992

Author: rstoyanchev

spring-web/src/main/java/org/springframework/web/client/support/RestClientHttpServiceGroupAdapter.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2002-2025 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.web.client.support;
+
+import org.springframework.web.client.RestClient;
+import org.springframework.web.service.invoker.HttpExchangeAdapter;
+import org.springframework.web.service.registry.HttpServiceGroupAdapter;
+import org.springframework.web.service.registry.HttpServiceGroupConfigurer;
+
+/**
+ * Adapter for groups backed by {@link RestClient}.
+ * 
+ * @author Rossen Stoyanchev
+ * @since 7.0
+ */
+@SuppressWarnings("unused")
+public class RestClientHttpServiceGroupAdapter implements HttpServiceGroupAdapter<RestClient.Builder> {
+
+	@Override
+	public RestClient.Builder createClientBuilder() {
+		return RestClient.builder();
+	}
+
+	@Override
+	public Class<? extends HttpServiceGroupConfigurer<RestClient.Builder>> getConfigurerType() {
+		return RestClientHttpServiceGroupConfigurer.class;
+	}
+
+	@Override
+	public HttpExchangeAdapter createExchangeAdapter(RestClient.Builder clientBuilder) {
+		return RestClientAdapter.create(clientBuilder.build());
+	}
+
+}

spring-web/src/main/java/org/springframework/web/client/support/RestClientHttpServiceGroupConfigurer.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2002-2025 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.web.client.support;
+
+import org.springframework.web.client.RestClient;
+import org.springframework.web.service.registry.HttpServiceGroupConfigurer;
+
+/**
+ * Extension of {@link HttpServiceGroupConfigurer} to configure groups
+ * with a {@link RestClient}.
+ *
+ * @author Rossen Stoyanchev
+ * @since 7.0
+ */
+public interface RestClientHttpServiceGroupConfigurer extends HttpServiceGroupConfigurer<RestClient.Builder> {
+
+}