如何从 Owin 上下文中获取查询字符串参数？

Question

When working against the instagram API, it requires the client to capture ?code=[some code] from a successful OAuth response:

Step Two: Receive the redirect from Instagram

Once a user authorizes your application, we issue a redirect to your redirect_uri with a code parameter to use in step three.

http://your-redirect-uri?code=CODE

By default the OWIN middleware causes a redirect to /signin-instagram where the request is handled and then passed on to a new path that I choose (eg /oauth/instagram ) where I get access to an OWIN context.

Because of the chained redirects the code querystring value is lost and it seems that I need a way to retrieve it from the OWIN context, but I can't find one.

Answer 1

The answer is that you don't. The owin provider should be (and is for Instagram) fetching anything relevant on the querystring and insert it into the Claims