I keep seeing Bing in my optional updates. It gives a little information but I'm still confused. Bing Desktop sets the daily Bing photo as the desktop background and adds a floating search bar. It DOES change the background daily.. Windows 10 Pro - Start10 - part of a local network which is a '3rd party optimizer-free' zone..
2.2.4 HTTP OPTIONS Response. After receiving an HTTP OPTIONS request, a server responds with an HTTP OPTIONS response that specifies the protocol versions it supports.
HTTP 1.1 can be more complex than this, allowing multiple requests and responses on a single connection, but the old one request per connection style is still legal. Looking at your capture, what I see is that the server sends its FIN and ACK bits, and the client responds with a RST.