1. Instead of fetching the managed response's cookies twice, and then
comparing them to themselves, fetch the managed response's cookies once and
then the native response's cookies once, and compare that. This way the
test does what it's actually supposed to do!
2. Don't pass if we fail to get the managed response's cookies.
3. Improve assertions to verify the actual cookie content as well.
4. Improve diagnostics if an exception was thrown by checking for the
exception first instead of failing due to something else being different
(since the underlying cause of the difference is the exception, that's what
will have the most information about the failure).
5. Use httpbin.org instead of microsoft.com, since microsoft.com does UA
sniffing and returns different results between the http handlers :/
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