add warning when not configure base url

Author: DanielLiu1123

src/main/java/com/freemanan/starter/httpexchange/ExchangeClientCreator.java

@@ -5,6 +5,8 @@
 import com.freemanan.starter.httpexchange.shaded.ShadedHttpServiceProxyFactory;
 import java.time.Duration;
 import java.util.Optional;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
 import org.springframework.core.env.Environment;
 import org.springframework.util.Assert;
@@ -22,6 +24,7 @@
  * @author Freeman
  */
 class ExchangeClientCreator {
+    private static final Logger log = LoggerFactory.getLogger(ExchangeClientCreator.class);
 
     private final ConfigurableBeanFactory beanFactory;
     private final Environment environment;
@@ -108,6 +111,8 @@ private WebClient buildWebClient() {
                 baseUrl = "http://" + baseUrl;
             }
             builder.baseUrl(baseUrl);
+        } else {
+            log.warn("No base-url configuration found for client: {}", clientType.getName());
         }
         if (!CollectionUtils.isEmpty(channelConfig.getHeaders())) {
             channelConfig