httpQuery() returning null

Question

Hi All, 
 As i am new to appian i am getting null while i try to hit the following url through httpQuery() function from Expression Rule. 
 URL: http://samples.openweathermap.org/data/2.5/weather?id=2172797&appid=b6907d289e10d714a6e88b30761fae22 
 Please help me how can i access json data that this url is returning. 
 Thanks in advance.

Justin Watts · Accepted Answer

Here is one way to make the call, and process the response from JSON into a dictionary. I've successfully tested this in 17.4, but I expect this to work in earlier versions. You could also use an Integration object if your Appian version supports that object type. 
 
load( 
 local!call:a!httpQuery( 
 url:" samples.openweathermap.org/.../weather 
 method:"GET" 
 ).result.body, 
 a!fromJson(local!call) 
)