use concrete exception

Author: diegomarquezp

google-http-client-apache-v5/src/main/java/com/google/api/client/http/apache/v5/Apache5HttpRequest.java

@@ -18,6 +18,7 @@
 import com.google.api.client.http.LowLevelHttpResponse;
 import java.io.IOException;
 import java.util.concurrent.TimeUnit;
+import org.apache.hc.client5.http.ClientProtocolException;
 import org.apache.hc.client5.http.classic.HttpClient;
 import org.apache.hc.client5.http.classic.methods.HttpUriRequestBase;
 import org.apache.hc.client5.http.config.RequestConfig;
@@ -69,7 +70,7 @@ public LowLevelHttpResponse execute() throws IOException {
     try {
       target = RoutingSupport.determineHost(request);
     } catch (HttpException e) {
-      throw new RuntimeException("The request's host is invalid.", e);
+      throw new ClientProtocolException("The request's host is invalid.", e);
     }
     // we use a null context so the client creates the default one internally
     ClassicHttpResponse httpResponse = httpClient.executeOpen(target, request, null);