http: expose concat url (#730)

Author: MykolaGolubyev

webtau-http/src/main/java/org/testingisdocumenting/webtau/http/Http.java

@@ -81,6 +81,7 @@
 import java.util.zip.GZIPInputStream;
 import javax.net.ssl.HttpsURLConnection;
 import org.apache.commons.io.IOUtils;
+import org.testingisdocumenting.webtau.utils.UrlUtils;
 import sun.net.www.protocol.https.HttpsURLConnectionImpl;
 
 public class Http {
@@ -123,6 +124,10 @@ public boolean ping(String url, HttpQueryParams queryParams, HttpHeader header)
         return true;
     }
 
+    public String concatUrl(String baseUrl, String relativeUrl) {
+        return UrlUtils.concat(baseUrl, relativeUrl);
+    }
+
     public <E> E get(String url, HttpQueryParams queryParams, HttpHeader header, HttpResponseValidatorWithReturn validator) {
         return executeAndValidateHttpCall("GET", queryParams.attachToUrl(url),
                 this::getToFullUrl,