远程服务器返回错误：（405）mvc 5中不允许使用方法

Question

I use to login in gmail throgh my application using same credential as we used for gmail login. i am getting The remote server returned an error:

(405) Method Not Allowed,

on

 var httpResponse = (HttpWebResponse)request.GetResponse();

Below is my Code sample:

        var stringBuilder = new StringBuilder();
        var request = (HttpWebRequest)WebRequest.Create(url);
        var captcha = model.catchpa;
        var username = model.Email;
        var user = "UserName";
        var password = model.Password;
        var data = Encoding.ASCII.GetBytes(string.Format("username={0}&user={1}&password={2}&captcha={3}", username, user, password, captcha));
        request.ContentLength = data.Length;
        request.Method = "POST";
        request.ContentType = "application/json;charset=UTF-8";
        request.Accept = "*";
        request.Headers.Add("Accept-Encoding", " gzip, deflate, br");
        request.Headers.Add("Accept-Language", "en-GB,en;q=0.5");
        request.Headers.Add("Cache-Control", "max-age=0");
        request.Headers.Add("Upgrade-Insecure-Requests", "1");
        request.Headers.Add("Cookie", "x-apm-brtm-bt-p=Chrome; x-apm-brtm-bt-pv=55; x-apm-brtm-bt-url=%2F; WMRUMC=%7B%7D; CaptchaCookie=6cd0895847f3412e842dff4d932543e6; x-apm-brtm-response-bt=bs%3D-1%2Cbt%3D-1%2Cbtc%3D-1%2CCorBrowsGUID%3D4521608D0AF27A07195F9576C4193CD6%2Curl%3D%2Fservices%2Fcaptcha; x-apm-brtm-response-bt-id=_oxn3avih0");
        request.KeepAlive = true;
        request.Host = "services.gst.gov.in";
        request.UserAgent = "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0";
        request.Referer = "https://services.gst.gov.in/services/login";

        using (var stream = request.GetRequestStream())
        {
            stream.Write(data, 0, data.Length);
        }

        var httpResponse = (HttpWebResponse)request.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
        }

Answer 1

Your problem is here:

request.Method = "POST";

You are using HTTP POST to obtain your data. The server does not accept your post request, either because POST is not allowed at all or your request is incomplete.

Use a HTTP sniffing tool like Fiddler and do your request manually in a web browser. There you can see how to correctly access the page.