Extracting http status and reason phrase in Mule 4 Dataweave 2.0 language

It took me forever to figure out this seemingly simple task so now I want to share in case another mule developer out there is having the same problem and can stumble across this example!

Here’s an example DataWeave 2.0 function that captures the HTTP status code and reason phrase from an HTTP response:

 extractHttpStatus(response: HttpResponse): String = 
    response.statusCode ++ " " ++ response.reasonPhrase

This function takes an HttpResponse object as input and returns a string that contains both the status code and reason phrase, separated by a space.

You can use this function in your DataWeave script to extract the HTTP status code and reason phrase from an HTTP response. For example, if you’re using the http connector to make an HTTP request, you can call this function to extract the status code and reason phrase like this:

%dw 2.0
import * from dw::module::HTTP
output application/json
---
{
    responseStatus: extractHttpStatus(http("https://example.com").get())
}

In this example, we’re making a GET request to https://example.com using the http connector, and then passing the resulting HttpResponse object to the extractHttpStatus function to extract the status code and reason phrase. The resulting JSON output will contain a responseStatus field that contains the status code and reason phrase as a string, like this:

{
  "responseStatus": "200 OK"
}

Also ..if you just want to cherry pick the reason phrase from a payload returned …

%dw 2.0

import * from dw::module::HTTP

input payload application/json output application/json

—

{ responseReasonPhrase: http.headers(payload)[“reason-phrase”] }