wso2 - How can i get HEADER in my ESB i am using following property, its not not working -

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i getting data mobile client sending data in json sending values header wso2esb getting normal values using property

 <property name="asset" expression="//asset/text()" scope="default"/>

but how can header in esb using property not not working

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

how work revert me

thanks in advance

if trying access 'username', configuration should be:

<property name="some_name_here" expression="get-property('transport', 'username')"/>

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