How do I have a URI send Tasker an intent?

I have a task that goes to a webpage, and I'm trying to get it to callback to Tasker. I assume I'll need to receive an intent in Tasker, but I can't figure out how to do that. The two ways I've tried so far are:

1. Link: myapp://callback?param=abc123
   
   Tasker:

   
   
   

   Action:
   
   Cat: Default
   
   Cat: None
   
   Scheme: myapp
   
   Mime Type: text/plain
   
   




2. Link: intent://#Intent;action=myapp.action;end?param=abc123
   
   Tasker:

   
   
   

   Action: myapp.action
   
   Cat: Default
   
   Cat: None
   
   Scheme: 
   
   Mime Type: text/plain
   
   

I've tried fiddling with various options and variations on these, but nothing seems to do anything. Given the webpage I'm going to supplies information with the query parameter and gives an error with the second way, I assume I'll need the first. I don't know why it isn't working though. How am I supposed to do this?