Determine HTTP Protocol Version in ASHX Handler

Is it possible to det开发者_如何学JAVAermine the HTTP protocol version (e.g. 1.0 vs. 1.1) used for a request within a .ashx handler? I can see all of the header information except for the version in Request.Params.

If not, what avenues are available to discover the HTTP protocol version when processing an HTTP request in ASP.Net?

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try Request.ServerVariables["SERVER_PROTOCOL"]