Hi , 

     we have an api in APIC v10 which we just migrated from V5 . when we compare the response between V5 & V10 , found out that <?xml version="1.0" encoding="UTF-8"?> is missing in V10.  The response from backend is without xml tag . so how it is getting added in V5 where as in V10 it s missing . This xml tag is needed by consumer to process the response . so V10 consumer application is not able to process the response. Any thought will be highly appreciated.

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Debasis Samal
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Why not just get your backend to add that and the gateway will honour it?

There are a lot of differences between v5 and v10, that doesn't mean they are defects. Given v10 has been around for 5 years now you are remarkably late with moving to it, v5 support ended years ago. I'd recommend simply adapt to how v10 behaves - in this case you can add the tag in your backend, or could add it in custom policies such as gatewayscript in your app assembly.