98.03-在某些情况下需要从Url获取Token

在一些情况下不从Request Header中获取JWT，可以同URL中获取。

重点在于account_token

services
.AddAuthentication()
.AddJwtBearer(options =>
{
    options.Authority = configuration["AuthServer:Authority"];
    options.RequireHttpsMetadata = Convert.ToBoolean(configuration["AuthServer:RequireHttpsMetadata"]);
    options.Audience = "ContestPlatform";
    options.BackchannelHttpHandler = new HttpClientHandler
    {
        ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
    };
    options.Events = new JwtBearerEvents
    {
        OnMessageReceived = async context =>
        {
            context.Token = context.Request.Query["account_token"];
            await Task.CompletedTask;
        }
    };
});