wso2 - How to access the Header values in Wso2ESb -

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this question has answer here:

i using wso2esb when getting request mobile client header . issue unable access in wso2esb insequence further process how can have properties config is

 <log>             <property name="faisal" expression="get-property('username')"/>             <property name="username" expression="get-property('transport', 'accept')"/>             <property name="username" expression="//username/text()"/>             <property name="password" expression="//password/text()"/>          </log>

every thin showing me null , header sending this

login {"password":"gbadmin","username":"faisal"}

how can access insequence in advance

how json request looks like? if json request given below

{ "login": { "username": "test", "password": "aa" } }

you should able access username information 

<property name="username" expression="//login/username"/>

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