Problems accessing HttpContext in ASP. NET Async (async/await)

An example of an official example of uploading a file using the Web API:

await Request.Content.ReadAsMultipartAsync (provider);

There are several sessions in the project, including the session object obtained through HttpContext in other libraries, and the direct access session is empty after the await.

What to do, file to upload ah.

Web search without fruit, and later found that HttpContext actually support the set method, then before the await storage HttpContext reference, after the await will be the reference to HttpContext, which seems to pass.

After the test pass, perfect operation.

var context = System.Web.HttpContext.Current; await  = context;

Problems accessing HttpContext in ASP. NET Async (async/await)