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    <p>First: benchmark, benchmark, benchmark. We were quite surprised at the performance characteristics of Azure; in particular SQL Azure was slower than our Rackspace hosted system by a factor of two or three. The latency between the database and the server eclipsed everything else.</p> <p>That said: in theory I'd confirm your guess that using usernames/passwords between client and service will be faster than ACS. </p> <p>But do you need to do any credential checking at all? Can you use private internal endpoints (as here: <a href="http://msdn.microsoft.com/en-us/library/windowsazure/gg432980.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windowsazure/gg432980.aspx</a>) -- if so then there's no need for any credential checking. </p> <p>If you do need to expose a public endpoint then I'd seriously consider using client SSL certificates instead as this can provide encryption as well as authentication.</p> <p>Regarding REST versus binary, much depends on the kind of application you're working with. My experience with the Microsoft REST stack is that it's remarkably efficient: in practice by the time the connection is established and data is flowing you basically have a raw TCP connection between client and server. What you gain with REST, however, is the HTTP semantics, ability to use load balancers, and general convenience.</p> <p>But, again: I'd create some sample applications and test for yourself. (And do come back and post a link to your blog entry where you publish the results, eh?)</p>
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    1. USJeremy McGee
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    1. COThanks Jeremy. The issue with internal endpoints is that they cannot be used until the web app is hosted within Azure, initially, it won't. Your findings on the latency between the db and the server is interesting. I will absolutely post my findings. Thanks for the post!
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    2. COWell this is interesting:"Windows Azure provides load balancing across each public endpoint, allowing you to scale your application to as many instances as you'd like. You need to ensure that your application is stateless (or stores state in a common area across instances, such as blobs or tables). The only endpoints not load-balanced are internal endpoints. So, if you're doing some type of inter-role communication, like from a web role to one of several worker role instances hosting a wcf service on an internal endpoint, you'd need to handle load balancing across those instances." SO posting
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