带有 JSON 数据的 Java 与 C# HTTP 请求答案

【问题标题】：Java vs C# HTTP request with JSON data带有 JSON 数据的 Java 与 C# HTTP 请求
【发布时间】：2014-03-07 04:00:01
【问题描述】：

我正在尝试将 Java 程序转换为 C#。该程序使用 HTTP POST 将 JSON 对象发送到服务器。 Java 程序运行良好。返回 200。但 C# 程序返回 400（错误请求）。可能是什么原因

Java 代码

String base_url = "https://test-url.com";
String username = "test-user";
String password = "test-pass";
String client_id = "test-client";
String client_secret = "test-key";
String loginUrl = base_url + "session/login";

Charset utf8 = Charset.forName("UTF-8");
ContentType jason_content_type = ContentType.create("application/json", utf8); 
try {
    HttpClient c = HttpClients.custom().setUserAgent(client_id + "/1.0").build();
    HttpPost p = new HttpPost(loginUrl);
    String json_str = "{" + "\"userId\":\"" + username + "\"," + "\"password\":\"" + password + "\"," + "\"clientId\":\"" + client_id + "\"," + "\"clientSecret\":\"" + client_secret + "\"" + "}";
    p.setEntity(new StringEntity(json_str, jason_content_type));
    HttpResponse r = c.execute(p);
    int status = r.getStatusLine().getStatusCode(); 
} catch (IOException e) {
    System.out.println(e);
}

C# 代码

    string base_url = "https://test-url.com";
    string username = "test-user";
    string password = "test-pass";
    string client_id = "test-client";
    string client_secret = "test-key";
    string login_url = base_url + "session/login";

    var httpWebRequest = (HttpWebRequest)WebRequest.Create(login_url);
    httpWebRequest.ContentType = "application/json";
    httpWebRequest.Method = WebRequestMethods.Http.Post;
    httpWebRequest.UserAgent = client_id + "/1.0";
    httpWebRequest.ProtocolVersion=HttpVersion.Version11;

    using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream(), Encoding.UTF8))
    {
    string json_str = "{" + "\"userId\":\"" + username + "\"," + "\"password\":\"" + password + "\"," + "\"clientId\":\"" + client_id + "\"," + "\"clientSecret\":\"" + client_secret + "\"" + "}";
    streamWriter.Write(json_str);
    streamWriter.Flush();
    streamWriter.Close();

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

【问题讨论】：

您是否尝试过使用 fiddler 来查看请求之间的区别？
不，我从不使用这种东西。等等，我试试
当您从 C# 编写 json 时，它也会写入正斜杠。所以当它在另一边接收时，你必须从字符串中删除它们。
实际上服务器不在我们的控制之下。它是一项公共服务。
如果需要，您可以使用代理（如 fiddler）拦截 https 流量。或者可能更简单：将您的代码临时指向一个非 https 端点，以便您可以轻松扫描通过网络发送的实际数据。

标签： c# java http-post

【解决方案1】：

尝试在 C# 中添加：

httpWebRequest.ContentType = "application/x-www-form-urlencoded";

【讨论】：