如何发出HTTP POST Web请求

  • Z时代
  • 2024-01-10
  • 分类：问答

Canonical

POST

我可以GET提出请求，但是我不知道如何提出POST请求。

回答：

有几种执行HTTPGET和POST请求的方法：

回答：

可用：.NET Framework 4.5+，.NET Standard 1.1+，.NET Core 1.0+。

目前，它是首选方法，并且具有异步性和高性能。在大多数情况下，请使用内置版本，但对于非常旧的平台，则提供了NuGet软件包。

using System.Net.Http;

设定

建议HttpClient在应用程序的生命周期中实例化一个实例，并共享它，除非您有特殊原因不这样做。

private static readonly HttpClient client = new HttpClient();

请参阅HttpClientFactory以获取依赖项注入解决方案。

  • POST

    var values = new Dictionary<string, string>

    {

    { “thing1”, “hello” },

    { “thing2”, “world” }

    };

    var content = new FormUrlEncodedContent(values);

    var response = await client.PostAsync("http://www.example.com/recepticle.aspx”, content);

    var responseString = await response.Content.ReadAsStringAsync();

  • GET

    var responseString = await client.GetStringAsync("http://www.example.com/recepticle.aspx");

回答：

  • POST
     var client = new RestClient("http://example.com");

    // client.Authenticator = new HttpBasicAuthenticator(username, password);

    var request = new RestRequest(“resource/{id}”);

    request.AddParameter(“thing1”, “Hello”);

    request.AddParameter(“thing2”, “world”);

    request.AddHeader(“header”, “value”);

    request.AddFile(“file”, path);

    var response = client.Post(request);

    var content = response.Content; // Raw content as string

    var response2 = client.Post(request);

    var name = response2.Data.Name;

这是一个更新的库，具有流畅的API，测试助手，在后台使用HttpClient且可移植。可通过NuGet获得。

    using Flurl.Http;

  • POST

    var responseString = await "http://www.example.com/recepticle.aspx"
    .PostUrlEncodedAsync(new { thing1 = "hello", thing2 = "world" })
    .ReceiveString();

  • GET

    var responseString = await "http://www.example.com/recepticle.aspx"
    .GetStringAsync();

回答：

可用：.NET Framework 1.1+，.NET Standard 2.0+，.NET Core 1.0+。在.NET

Core中，它主要是为了兼容性-它可以包装HttpClient，性能较低且不会获得新功能。

using System.Net;
using System.Text;  // For class Encoding
using System.IO;    // For StreamReader

  • POST

    var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");

    var postData = “thing1=” + Uri.EscapeDataString(“hello”);

    postData += “&thing2=” + Uri.EscapeDataString(“world”);

    var data = Encoding.ASCII.GetBytes(postData);

    request.Method = “POST”;

    request.ContentType = “application/x-www-form-urlencoded”;

    request.ContentLength = data.Length;

    using (var stream = request.GetRequestStream())

    {

    stream.Write(data, 0, data.Length);

    }

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

    var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

  • GET

    var request = (HttpWebRequest)WebRequest.Create("http://www.example.com/recepticle.aspx");

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

    var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();

回答：

这是一个包装HttpWebRequest。与比较HttpClient。

可在：.NET Framework 1.1+，NET Standard 2.0+，.NET Core 2.0+

using System.Net;
using System.Collections.Specialized;

  • POST

    using (var client = new WebClient())

    {

    var values = new NameValueCollection();

    values[“thing1”] = “hello”;

    values[“thing2”] = “world”;

    var response = client.UploadValues("http://www.example.com/recepticle.aspx", values);
    var responseString = Encoding.Default.GetString(response);

    }

  • GET

    using (var client = new WebClient())

    {

    var responseString = client.DownloadString("http://www.example.com/recepticle.aspx”);

    }

以上是 如何发出HTTP POST Web请求 的全部内容， 来源链接： utcz.com/qa/423030.html

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