How to capture the value of the body (stream) of a request without deleting it?

I am trying to capture the body of a request in an authorization class (AuthorizationHandler), however because this body is a Stream, after reading its contents the next post request can not be executed because the stream has already been read and its contents no longer exist.

I'm using the following code:

protected override Task HandleRequirementAsync(AuthorizationHandlerContext context, Autorizacao requirement)
{
    var routeValues = context.Resource as AuthorizationFilterContext;
    if (routeValues != null)
    {
        var obj = StreamToObject(routeValues.HttpContext.Request.Body);
        context.Succeed(requirement);
    }
    return Task.FromResult(0);
}

private Object StreamToObject(Stream stream)
{
    try
    {
        string content;
        using (var reader = new StreamReader(stream))
        content = reader.ReadToEnd();
        return Newtonsoft.Json.JsonConvert.DeserializeObject(content);
    }
    catch (Exception e)
    {
        throw e;
    }
}

I know this is happening because after reading the stream your content is being discarded, but I would like to know what I can do to get around this problem?