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About HTTP Connector Migration

Key changes in the HTTP connector for Mule Runtime 4.0 and later that can affect migration are:

  • The http:listener-config and http:request-config have a new, inner connection element.

  • The HTTP body option replaces the source parameter in the request and is incorporated to the Listener’s response and error response.

  • The HTTP Listener and Request components return attributes, which include all previous properties.

  • HTTP parsing has been removed. DataWeave now handles special mime types. It can be used to both read and write such payloads.

  • The static-resource-handler is renamed load-static-resource.

  • To access source HTTP Listener and HTTP Request attributes, the following DataWeave syntax replaces the Mule Expression Language (MEL) expressions for accessing past properties.

    #[attributes.<parameter>]

The "HTTP Connector XML Reference" maps Mule 3.x MEL expressions to Mule 4.0 DataWeave expressions.

The following constructs are removed in Mule Runtime 4.0:

  • 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.

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