Retrieve Custom Header from HTTP request

In this tutorial we will explain how we can retrieve custom header from HTTP request in Mule 4. We are sending the messageid and transactionid as custom header with http rest call

Create a project in Anypoint studio and configure the listener

Create the transform message and write the dataweave expression to retrieve the header values.

Dataweave expression:

%dw 2.0
output application/json
---
{
  "message_id":attributes.Headers.'messageid',
  "transaction-id":attributes.Headers.'transactionid'
}

There is another way to retrieve the headers values

%dw 2.0
output application/json
---
{
  "message_id":attributes.Headers.messageid,
  "transaction-id":attributes.Headers.transactionid
}

Deploy the project and test from soapui

messageid and transactionid is passed as custom Header in below SOAP UI

Sample application:retrieveheader sample application