Mule flow to PUT form encoded data through HTTP

gistfile1.xml

<flow name="httpputFlow" doc:name="httpputFlow">
    <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8086" doc:name="HTTP"/>
    <scripting:component doc:name="Groovy">
        <scripting:script engine="Groovy">
            <scripting:text>
                <![CDATA[
        
                    HashMap map = new HashMap();
                    map.put("param1", "value1");
                    map.put("param2", "value2");
                    map.put("param3", "value3");
                    return map;
            
                ]]>
            </scripting:text>
        </scripting:script>
    </scripting:component>
    <scripting:component doc:name="Groovy">
        <scripting:script engine="Groovy">
            <scripting:text>
                <![CDATA[
                
                message.payload = payload.collect { k,v -> "$k=$v"}.join('&');
                
                ]]>
            </scripting:text>
        </scripting:script>
    </scripting:component>
    <http:outbound-endpoint exchange-pattern="request-response" host="localhost" port="8080" method="PUT" doc:name="HTTP">
        <properties> 
            <spring:entry key="Content-Type" value="application/x-www-form-urlencoded"/> 
        </properties>
    </http:outbound-endpoint>
</flow>

Now it's not required to create the Form payload manually. When the HTTP Request connector receives a Map object, it will send the Form URL Encoded request, including the Content-Type.

https://docs.mulesoft.com/mule-user-guide/v/3.8/http-request-connector#generate-the-request-body-with-content-type-application-x-form-urlencoded

The Map can be created with Dataweave. For example:

<dw:transform-message doc:name="Transform to Map">
    <dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
{
	request: write(payload, "application/xml")
}]]></dw:set-payload>
</dw:transform-message>
<http:request config-ref="HTTPConfiguration" path="/" method="POST" doc:name="Call Web Service">
</http:request>