Hello, Sorry I don't have full curl responses, but I haven't been able to reproduce via curl.. The below is from our logs as the response to a statuses/update.xml request. It looks like twitter is overloaded and is attempting to redirect to "503.html" but permissions for that file are not set correctly so it is returning a 403 in response to the request.. This is happening fairly frequently right now when requests to post come through the server, but I am still working on reproducing with a curl output.
httpRequest Failed - 403 - /statuses/update.xml <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>403 Forbidden</title> </head><body> <h1>Forbidden</h1> <p>You don't have permission to access /503.html on this server.</p> </body></html>