遠程服務器返回404找不到錯誤C＃

Question

我正在創建一個應用程序，用於檢查用戶狀態。 我收到404找不到錯誤。 任何人都可以在下面發布幫助代碼。 我究竟做錯了什么？

 static void Main(string[] args)
    {
        var Usernames = File.ReadAllLines(@"C:\Users\Hasan\Desktop\Usernames.txt");
        Parallel.ForEach(Usernames, Username =>
        {
            try
            {
                using (WebClient WebClient = new WebClient())
                {
                    WebClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36");
                    string response = WebClient.DownloadString("https://www.habbo.com/api/public/users?name=" + Username);
                    if(response.Contains("not - found"))
                    {
                        Console.WriteLine("Possibly Free : " + Username);
                    }
                }
            }
            catch (Exception ex)
            {
                //Console.WriteLine("Error on Username : " + Username);
                Console.WriteLine(ex.Message);
                Console.ReadLine();
            }
        });
    }

Answer 1

因為某種原因，您的用戶名是空白＆

您的DownloadString變為

https://www.habbo.com/api/public/users?name=

因此出現404錯誤。

嘗試在此行上放置調試器

string response = WebClient.DownloadString("https://www.habbo.com/api/public/users?name=" + Username);

您將看到一個空白的用戶名。

因為..我檢查了Api是否可以正常使用有效的用戶名，例如

https://www.habbo.com/api/public/users?name=trump

並返回有效的JSON

{"uniqueId":"hhus-04bce17a17b59979fbd97aa46110a650","name":"Trump","figureString":"hr-835-1402.hd-627-13.ch-3005-1326-97.lg-3483-1415-1415.he-3227-95.fa-3276-1328","motto":"covfefe","memberSince":"2011-05-11T22:20:28.000+0000","profileVisible":true,"selectedBadges":[{"badgeIndex":1,"code":"ACH_RegistrationDuration20","name":"100 % True Habbo XX","description":"Be a member of the community for 1825 days."},{"badgeIndex":2,"code":"UK824","name":"You took a quack at the duck games! (And won!)","description":""},{"badgeIndex":3,"code":"UK833","name":"Singapores National Flower","description":""},{"badgeIndex":4,"code":"UK835","name":"I picked a Lignum Vitae on Jamaica Day 2017!","description":""},{"badgeIndex":5,"code":"UK838","name":"Pretty Polly want a cracker?!","description":""}]}

Answer 2

webapi為每個未知用戶返回404錯誤。 在404響應中，Web客戶端引發了異常，因此您需要對驗證進行如下調整：

static void Main(string[] args)
{
    var Usernames = File.ReadAllLines(@"C:\Users\Hasan\Desktop\Usernames.txt");
    Parallel.ForEach(Usernames, Username =>
    {
        try
        {
            using (WebClient WebClient = new WebClient())
            {
                WebClient.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36");
                string response = WebClient.DownloadString("https://www.habbo.com/api/public/users?name=" + Username);
        }
        catch (Exception ex)
        {
            if ( ex is WebException and (ex.Response as HttpWebResponse)?.StatusCode.ToString() ?? ex.Status.ToString() == "404" )
            {
                Console.WriteLine("Possibly Free : " + Username);
            }
            //Console.WriteLine("Error on Username : " + Username);
            Console.WriteLine(ex.Message);
            Console.ReadLine();
        }
    });
}