Hi José, you have two ways:

1) You have to send the response to "<yourserver>/dsw/Test" with the header "Authorization"="<login:pass in base64>" before each visit to the page.

2) You can create a new web application "mdx2jsonpub" in MDX2JSON namespace with MDX2JSON.Rest. Next, you have to configure limited access for this application. For example, you create the new namespace with public dashboards,  and you specify only this namespace in the accessibility settings "mdx2jsonpub". Last you have to create the new public "dswpub" web application with DSW app, which makes requests to "mdx2jsonpub" and not to "mdx2json".