Well, i think that is solved for this error, you’ll just have to set the web viewer url in textbox like just i have done as shown in the image below 
And yah i have used an extension called extended web viewer( its link)
http://community.thunkable.com/uploads/thunkable1/original/2X/0/0d10c817a58b192db04af635df09702ced7a3242.aix
After that you will just have use the OnErrorOccured block just as the way i have used as shown in the image below:point_down:
By doing so if there error occurred of web page not found the web viewer will use the textbox text and replace all https:// and search it with Google
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