How to set multiple duplicate headers in Apigee Response

[miguelmendoza]

Today I ran into this question:

How do I set multiple "Set-Cookie" headers in the response message within an Apigee API Proxy?

Here the answer:

You must use the <Set> Element, followed by one or more <Add> elements within the Assign Message policy.

Here is an example:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<AssignMessage continueOnError="false" enabled="true" name="AM-SetCookies">
    <DisplayName>AM-SetCookies</DisplayName>
    <Properties/>
    <Set>
        <Headers>
            <Header name="Set-Cookie">cookie1=foo;path=/</Header>
        </Headers>
        <StatusCode>200</StatusCode>
    </Set>
    <Add>
        <Headers>
            <Header name="Set-Cookie">cookie2=bar;path=/</Header>
        </Headers>
    </Add>
    <IgnoreUnresolvedVariables>true</IgnoreUnresolvedVariables>
    <AssignTo createNew="false" transport="http" type="request"/>
</AssignMessage>

Hope this helps.