Make an external HTTP GET request with headers

  - 
  
 get_message 
 : 
  
 call 
 : 
  
 http.get 
  
 args 
 : 
  
 url 
 : 
  
 https://www.example.com/endpoint 
  
 headers 
 : 
  
 Content-Type 
 : 
  
 "text/plain" 
  
 query 
 : 
  
 some_val 
 : 
  
 "Hello 
  
 World" 
  
 another_val 
 : 
  
 123 
  
 result 
 : 
  
 the_message 
 - 
  
 return_value 
 : 
  
 return 
 : 
  
 ${the_message.body}