How to add custom content (secured WMS) to Web AppBuilder app

[MichalGasiorowski]

I want to create simple web app in Web AppBuilder Developer Edition 2.0.

The app should combine an ArcGIS Server service and a secured WMS.

My organization uses Portal for ArcGIS 10.3.1 so I'm not able to add a secured WMS as an item in Portal.

I think I can add secured WMS following the way presented in this example:

Custom layer - WMS | ArcGIS API for JavaScript 3.17

Which files generated by the Web AppBuilder should I modify to add custom content which cannot be adde to Portal items?

According to the example above I'll have to use addLayer method among others.

[MichaelRobb]

Shauna,  the issue is not the workflow but that using 10.3  does not support HTTPS WMS services.  10.4 does, I have no problem adding this wms service to a web map for example:

https://mesonet.agron.iastate.edu/cgi-bin/wms/iowa/rainfall.cgi?

I only have access to 10.4 at the moment though, not 10.3.1