About HTTP Connector Migration

The Mule 4 version of Anypoint Connector for HTTP (HTTP Connector) contains the following key differences from the Mule 3 version of the connector:

The http:listener-config element has a new inner connection element http:listener-connection.
The http:request-config element has a new inner connection element http:request-connection.
The HTTP body parameter replaces the source parameter in the request and is incorporated into the listener’s response and error response.
The HTTP Listener source and HTTP Request operation return attributes.
HTTP parsing has been removed because DataWeave now manages special MIME types. Use DataWeave syntax to read and write payloads.
The HTTP Load static resource operation XML code static-resource-handler is renamed to load-static-resource.
To access HTTP listener and HTTP request attributes, the following DataWeave syntax replaces the Mule Expression Language (MEL) expressions for accessing past properties:

#[attributes.<parameter>]

For more information about mapping Mule 3.x MEL expressions to Mule 4 DataWeave expressions, refer to the HTTP Connector XML Reference documentation.
The following constructs are removed in Mule 4:
- Request and response builders, http:request-builder and http:response-builder
- Worker threading profile
  
  The request, response, and error-response replace the builders. Using DataWeave expressions eliminates the need for building parameters.

See Also