[C#]跨域解决

context.Response.Clear();
context.Response.ContentType = "text/plain";
context.Response.ContentEncoding = System.Text.Encoding.UTF8;

var host = context.Request.UrlReferrer?.Host?.TrimEnd('/');
//log.Info($"Host:https://{host.Replace("https://", "")}");
if (PublicClass.OA_AllowOrigin != null && !string.IsNullOrEmpty(host))
{
    if (PublicClass.OA_AllowOrigin.Contains(host))
        context.Response.AddHeader("Access-Control-Allow-Origin", $"{context.Request.UrlReferrer.Scheme}://{host}");
}
else
{
    context.Response.AddHeader("Access-Control-Allow-Origin", "*");
}
context.Response.AddHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD,PUT");
context.Response.AddHeader("Access-Control-Max-Age", "3600");
context.Response.AddHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
context.Response.AddHeader("Access-Control-Allow-Credentials", "true");