Handling Accept encoding in esb mule

Question

I have mule flow look like below

    <?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:metadata="http://www.mulesoft.org/schema/mule/metadata" xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting" xmlns:json="http://www.mulesoft.org/schema/mule/json" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/json http://www.mulesoft.org/schema/mule/json/current/mule-json.xsd
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8111" doc:name="HTTP Listener Configuration"/>
    <http:request-config name="HTTP_Request_Configuration"  host="api.bonanza.com" port="443" doc:name="HTTP Request Configuration" protocol="HTTPS"/>
    <flow name="bonanza_fetchtoken_ceFlow">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/add" allowedMethods="GET,POST" doc:name="HTTP" />
        <flow-ref name="bonanza_addfixedpriceitemSub_Flow" doc:name="bonanza_addfixedpriceitemSub_Flow"/>
    </flow>
    <sub-flow name="bonanza_addfixedpriceitemSub_Flow">
        <message-properties-transformer doc:name="Message Properties">
            <add-message-property key="X-BONANZLE-API-DEV-NAME" value="t******I"/>
            <add-message-property key="X-BONANZLE-API-CERT-NAME" value="l*****F"/>
        </message-properties-transformer>
        <set-property propertyName="Content-Type" value="application/x-www-form-urlencoded" doc:name="Property"/>
        <set-property propertyName="Accept" value="application/json" doc:name="Property"/>
        <set-variable variableName="sim" value="{requesterCredentials:{bonanzleAuthToken:nWn1a9l3NT}}" doc:name="Variable"/>
        <scripting:transformer returnClass="java.util.Map" doc:name="Groovy">
            <scripting:script engine="Groovy"><![CDATA[import groovy.json.JsonBuilder
m = [addFixedPriceItemRequest:'{requesterCredentials:{bonanzleAuthToken:n*****T}}']
builder = new JsonBuilder()
builder(m)

]]></scripting:script>
        </scripting:transformer>

        <logger message="payload :#[payload]" level="INFO" doc:name="Logger"/>
        <http:request config-ref="HTTP_Request_Configuration" path="/api_requests/secure_request" method="POST" followRedirects="true" parseResponse="false" doc:name="HTTP">
            <http:success-status-code-validator values="0..599"/>
        </http:request>
        <logger message="resp :#[message.payloadAs(java.lang.String)]" level="INFO" doc:name="Logger"/>
    </sub-flow>
</mule>

I am able to receiving successful response from API using postman tool. I try to simulate same thing using above ESB mule flow. But API throws me an error as like below. Hence i have used requestb.in to compare the requests going from esb mule and postman tool. i found differences in the HTTP headers alone.

RAW body from postman to requestb.in -

addFixedPriceItemRequest={requesterCredentials:{bonanzleAuthToken:nW*****NT}}

RAW Body from ESB mule to requestb.in

addFixedPriceItemRequest=%7BrequesterCredentials%3A%7BbonanzleAuthToken%3AnW****NT%7D%7D

It seems that i have to serialize the json content before sending as content type - application/x-www-form-urlencoded. I found this info in this mule doc

How can i serialize json payload in groovy and sending as map payload?

API Error Response

{
  "ack": "Failure",
  "version": "1.0beta",
  "timestamp": "2016-03-15T07:18:11.000Z",
  "errorMessage": {
    "message": "Cannot determine what type of request you are making. Often this can be the result of data that has not been escaped before being passed to the API. If you are passing data with quotation marks or other special characters, you should translate it to JSON, then escape it, before sending it over the API."
  }
}

Please let me know for any additional info. Thanks in advance!

Answer 1

The flow got worked by adding key value pair in query parms in the http component. The flowVariable requestpayload has json string. So my Mule http component looks like below.

<http:request config-ref="HTTP_Request_Configuration" path="/api_requests/secure_request" method="POST" followRedirects="true" parseResponse="false" doc:name="HTTP">
            <http:request-builder>
                <http:query-param paramName="addFixedPriceItemRequest" value="#[flowVars.requestpayload]"/>
            </http:request-builder>
            <http:success-status-code-validator values="0..599"/>
        </http:request>