Azure website as a caching reverse proxy using ARR - caching

Question

We are migrating one of our websites to Azure which was previously setup using ARR (Application Request Routing) as a caching reverse proxy. It was setup as a reverse proxy which would honor the cache headers of the site it was proxying.
I've followed this guide on using an Azure website as a reverse proxy and it all works fine except that it doesn't honor the cache headers of the site it is proxying. I tried adding some more pertinent elements to my applicationHost.xdt, but nothing I do seems to have any effect.
Here is the relevant section from my applicationHost.xdt:
<system.webServer>
<caching xdt:Transform="Replace" enabled="true" enableKernelCache="true" maxResponseSize="1000000"></caching>
<proxy xdt:Transform="InsertIfMissing" enabled="true" reverseRewriteHostInResponseHeaders="true" minResponseBuffer="4096" responseBufferLimit="12392">
<cache enabled="true" queryStringHandling="Accept" validationInterval="00:01:00" />
</proxy>
</system.webServer>
and here is my web.config:
<system.webServer>
<rewrite>
<rules>
<rule name="CurrentTime" stopProcessing="true">
<match url="^times/?(.*)" />
<action type="Rewrite" url="http://example.com/{R:1}" />
</rule>
</rules>
</rewrite>
</system.webServer>
The web.config just routes all requests to /times to example.com. That part is working great. It is just ignoring the cache headers of example.com and not caching anything which is the main use case of why we want to setup a reverse proxy.
This same configuration works just fine on a normal machine with IIS and ARR installed.
I'd really like to get this working in azure websites without having to use a web role in a cloud service. I'm hoping this is possible.

Answer 1

Did you try to specify the preserveHostHeader="true" flag as follows?
<proxy xdt:Transform="InsertIfMissing" enabled="true" preserveHostHeader="true" reverseRewriteHostInResponseHeaders="true" />