如何将 HttpWebRequest 更改为 Httpclient

Question

I'm having trouble translating the code fragment in my example to http client. every time the code breaks in the timestamp calculation. can you help me with this? What I want to do is to write the same request using current technology. for example httpclient example code

    public byte[] GetTimeStamp(TimeStampModel model)
    {
        TimeStampRequestGenerator tsrq = new TimeStampRequestGenerator();
        tsrq.SetCertReq(model.certReq);
        BigInteger nonce = BigInteger.ValueOf(DateTime.Now.Ticks);
        TimeStampRequest tsr = tsrq.Generate(model.digestMethod.Oid, model.hash, nonce);
        byte[] data = tsr.GetEncoded();


        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(_url);
        req.Method = "POST";
        req.ContentType = "application/timestamp-query";
        req.ContentLength = data.Length;

        if (!string.IsNullOrEmpty(_user) && !string.IsNullOrEmpty(_password))
        {
            string auth = string.Format("{0}:{1}", _user, _password);
            req.Headers["Authorization"] = "Basic " + Convert.ToBase64String(Encoding.Default.GetBytes(auth), Base64FormattingOptions.None);
        }

        Stream reqStream = req.GetRequestStream();
        reqStream.Write(data, 0, data.Length);
        reqStream.Close();

        HttpWebResponse res = (HttpWebResponse)req.GetResponse();
        if (res.StatusCode != HttpStatusCode.OK)
        {
            throw new Exception("Sunucu geçersiz bir yanıt döndürdü");
        }
        else
        {
            Stream resStream = new BufferedStream(res.GetResponseStream());
            TimeStampResponse tsRes = new TimeStampResponse(resStream);
            resStream.Close();

            tsRes.Validate(tsr);
            if (tsRes.TimeStampToken == null)
            {
                throw new Exception("Sunucu herhangi bir zaman damgası döndürmedi");
            }

            return tsRes.TimeStampToken.GetEncoded();
        }
    }

Answer 1

I have a generic httpclientwrapper class. hope it helps

public async Task<TResponse> Post<TRequest, TResponse>(TRequest request, string urlToSend, string token)
    {
        try
        {


            using (HttpClient httpClient = new HttpClient())
            {
                httpClient.BaseAddress = new Uri(_url);
                httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue(JwtBearerDefaults.AuthenticationScheme, token ?? "");
                var serialized = new StringContent(JsonConvert.SerializeObject(request), Encoding.UTF8, "application/json");
                var httpResponseMessage = await httpClient.PostAsync(urlToSend, serialized);
                //httpResponseMessage.EnsureSuccessStatusCode();
                if (httpResponseMessage.IsSuccessStatusCode)
                {
                    var resStr = httpResponseMessage.Content.ReadAsStringAsync().Result;
                    var responseString = JsonConvert.DeserializeObject<TResponse>(httpResponseMessage.Content.ReadAsStringAsync().Result);

                    return responseString;
                }
                else if (httpResponseMessage.StatusCode == System.Net.HttpStatusCode.BadRequest)
                {
                    var errorRes = httpResponseMessage.Content.ReadAsStringAsync().Result;
                    throw new Exception(errorRes);
                }
                throw new Exception(httpResponseMessage.ReasonPhrase);
            }
        }
        catch (Exception e)
        {

            throw new Exception(e.Message);
        }
    }

In this code,

- I got token from constructor. Don't confuse with it.

• I use with asynchronous Tasks.
• The TRequest is used to make generic any request class object.
• TResponse is the class who gets response from remoteurl. You can use any class.
• I suppose you do not have to serialize object, also you have to set content type.