fix: #425

Author: yazan-abu-obaideh

src/main/java/io/weaviate/client6/v1/api/Config.java

@@ -158,8 +158,8 @@ public static class Custom extends Builder<Custom> {
      * <strong>443</strong> for HTTPS connection and <strong>80</strong> for HTTP.
      */
     public Custom scheme(String scheme) {
-      httpPort(scheme == "https" ? 443 : 80);
-      grpcPort(scheme == "https" ? 443 : 80);
+      httpPort("https".equals(scheme) ? 443 : 80);
+      grpcPort("https".equals(scheme) ? 443 : 80);
       return super.scheme(scheme);
     }
 
@@ -169,7 +169,7 @@ public Custom httpHost(String httpHost) {
     }
 
     public Custom httpPort(int port) {
-      this.grpcPort = port;
+      this.httpPort = port;
       return this;
     }