So I’ve been hoping that NSURLSessionStreamTask would make it easier to implement WebSockets by allowing me to make the initial HTTP handshake as a regular HTTP request with an NSURLSessionDataTask, then switch to a raw stream by returning NSURLSessionResponseBecomeStream from the response delegate method. I just tried it (on macOS 10.12.4 beta 4) and unfortunately it doesn’t work. Upgrading protocols requires that the value of the request's “Connection:” header be “Upgrade", but the value gets changed to “keep-alive” when sent, causing the server to reject the request. I assume this is one of those headers that the client can’t control. :( I can instead create the task as a stream from the beginning by calling -streamTaskWithHostName:port:. But then I’m basically working with raw TCP, so I need to construct and parse the HTTP messages myself, and more importantly, I lose SSL support and the semi-automatic handling of proxies, redirects and auth challenges. (It’s really no better than NSStream.) Is this something that could be fixed in the future, or is it considered a non-feature for NSURLSession to allow HTTP connection upgrades? —Jens _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/macnetworkprog/site_archiver%40lists... This email sent to site_archiver@lists.apple.com