Hello App Engine team or anyone that might know - I'm running into a bit of 
a wall. I need to update to a new AWS API that now requires the host header 
to have specific content which is part of an HMAC signed request.

In my case it's "host: webservices.amazon.com" when I'm making requests 
to https://webservices.amazon.com/paapi5/. 

I wired everything up but - as you know - urlfetch kills/replaces the host 
header. I can't tell what it's replacing it with and I'm not sure if there 
is work around. I can't leave it off but perhaps if I knew what it was 
putting in the header as a replacement I would be able to match the 
signature. As it stands now my requests are not valid.

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