The problem is with your curl options – the RCurl package doesn't seem to use internet2.dll.You need to specify the port separately, and will probably need to give your user login details as network credentials, e.g.,

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Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).

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