What’s new in WCF 4.5? Improved streaming in IIS hosting As promised in my previous post, I’m continuing my mission to inform you of new changes in WCF 4.5. If you’ve ever tried creating a WCF service that uses streamed requests (for example a file upload service) and host it in IIS, you may have noticed a strange behavior in your WCF service – it would seem that WCF is late in receiving the request, as if it was entirely loaded into the memory, and then passed to WCF. So is it streamed? or is it actually buffered? well, it’s both. This is the ninth post in the WCF 4.5 series. This post continues the previous posts on web-hosting features, and this time it is about the improved streaming capabilities of WCF 4.5 when it is hosted in IIS.