Tweaks to add example and allow port setting without protocol

Author: Paultagoras

client-v2/src/main/java/com/clickhouse/client/api/Client.java

@@ -235,7 +235,7 @@ public Builder() {
 
         /**
          * Builds a client object with the provided configuration through URL parameters.
-         *
+         *  (e.g. http://localhost:8123/someDatabase?user=default)
          * @param urlString - URL formatted string with protocol, host, port, and client configuration settings.
          * @return Client - a client object
          */
@@ -253,10 +253,9 @@ public Builder fromUrl(String urlString) {
                 this.addEndpoint(Protocol.HTTP, url.getHost(), port, secure);
 
                 for (ClientConfigProperties properties: ClientConfigProperties.values()) {
-                    String key = properties.getKey().replace(ClientConfigProperties.SERVER_SETTING_PREFIX, "");//People wouldn't pass with prefix
-                    String value = urlProperties.get(key);
+                    String value = urlProperties.get(properties.getKey());
                     if (value != null) {
-                        this.configuration.put(properties.getKey(), value);//We need to keep the original key
+                        this.configuration.put(properties.getKey(), value);
                     }
                 }
 

jdbc-v2/src/main/java/com/clickhouse/jdbc/internal/JdbcConfiguration.java

@@ -1,5 +1,7 @@
 package com.clickhouse.jdbc.internal;
 
+import com.clickhouse.client.api.http.ClickHouseHttpProto;
+
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.sql.DriverPropertyInfo;
@@ -58,7 +60,15 @@ public static boolean acceptsURL(String url) {
     private String cleanUrl(String url) {
         url = stripUrlPrefix(url);
         if (url.startsWith("//")) {
-            url = "http:" + url;
+            url = "http:" + url;//Default to HTTP
+            try {
+                URL parsedUrl = new URL(url);
+                if (parsedUrl.getPort() == ClickHouseHttpProto.DEFAULT_HTTPS_PORT) {//If port is 8443, switch to HTTPS
+                        url = "https:" + url;
+                }
+            } catch (MalformedURLException e) {
+                throw new IllegalArgumentException("URL is not valid.", e);
+            }
         }
 
         return url;