Where to add urn:adobe:aue:system:aemconnection and urn:adobe:aue:config:service for xwalk projects

I am trying to do the local setup for xwalk project. I have completed the following steps:

1. Running AEM instance in https mode.

2. Running Universal Editor Service locally on port 8000

3. "aem up" in port 3000

4. created a site using "site from template".

..and finally I have added the following meta tags in head.html : 

          <meta name="urn:adobe:aue:system:aemconnection" content="xwalk:https://localhost:8443">

          <meta name="urn:adobe:aue:system:fcsconnection" content="fcs:https://example.franklin.adobe.com/345fcdd">

          <meta name="urn:adobe:aue:config:service" content="https://localhost:8000">

When i try to edit  the "index" page using the following url : https://experience.adobe.com/#/aem/editor/

but when i preview the page and right click view source, it shows the "urn:adobe:aue:system:aemconnection" as "xwalk:http://localhost:4502".

 

I am not able to save edited content and it shows the following error:

 

 

 

Is "head.html" is the right place to add the meta tags? If not then pls let me know where to add those meta tags for xwalk projects.