HttpClient.PostAsync 的字符编码问题

Question

我们有一个遗留的网络应用程序，它可以在浏览器中手动运行。当我尝试使用 http posts 从代码中使用相同的网络应用程序时，我得到一些土耳其语字符作为 ?.

我有以下代码来制作 http post:

var httpClient = new HttpClient(); //static readonly in real code

var content = new StringContent("id_6=some text with Turkish characters öçşığüÖÇŞİĞÜ", Encoding.GetEncoding("ISO-8859-9"), "application/x-www-form-urlencoded");
var response = httpClient.PostAsync(url, content).Result; //I know this is not a good way, I'll focus on it later
var responseInString = response.Content.ReadAsStringAsync().Result;
File.WriteAllText("c:\temp\a.htm", responseInString);

Web 应用程序 returns 我 html 有一些输入值，包括那些由我的代码 post 编辑的值。由我的代码 post 编辑的表单值和使用我的值计算的表单值具有错误的土耳其语字符，而带有土耳其语字符的硬编码提交按钮看起来没问题。

Web 应用程序 returns 此 html（为简单起见被截断）到我的代码：

<!-- BELOW IS THE HARDCODED FORM FIELD WITH TURKISH CHARS OK! DISPLAYED AS: Programı Çağır -->
<input type="submit" value="Program&#305; &Ccedil;a&#287;&#305;r" name="j_id_jsp_262293626_16"/>

<!-- IRRELEVANT HTML REMOVED -->

<!-- BELOW IS THE OUTPUT FORM FIELD WITH CHAR ş BAD! DISPLAYED AS: some text with Turkish characters öç???üÖÇ???Ü -->
<input type="text" value="some text with Turkish characters &ouml;&ccedil;???&uuml;&Ouml;&Ccedil;???&Uuml;" id="id_2" name="id_2"/>

<!-- BELOW IS THE INPUT FORM FIELD WITH CHAR ş BAD! -->
<input type="text" value="some text with Turkish characters &ouml;&ccedil;???&uuml;&Ouml;&Ccedil;???&Uuml;" id="id_6" name="id_6" />

回复headers看起来不错：

有什么问题吗？

编辑：类似的代码 posting 到 sample form 可以正常工作：

    static readonly HttpClient httpClient = new HttpClient();

    [TestMethod]
    public void TestHttpClientForTurkish()
    {
        var data = new Dictionary<string, string>()
        {
            {"fname", "öçşığü" },
            {"lname", "ÖÇŞİĞÜ" }
        };

        var content = new FormUrlEncodedContent(data);
        var response = httpClient.PostAsync("https://www.w3schools.com/action_page.php", content).Result;

        var responseInString = response.Content.ReadAsStringAsync().Result;
        Assert.IsTrue(responseInString.Contains("öçşığü") && responseInString.Contains("ÖÇŞİĞÜ"));
    }

Answer 1

试试下面的代码

public static async Task SendRequestAsync()
        {

            var data = new Dictionary<string, byte[]>();
            var key1 = "fname";

            var val1 = Encoding.Unicode.GetBytes("öçşığü");
            data.Add(key1, val1);

            var key2 = "lname";

            var val2 = Encoding.Unicode.GetBytes("ÖÇŞİĞÜ");
            data.Add(key2, val2);
            MemoryStream fs = new MemoryStream();
            BinaryFormatter formatter = new BinaryFormatter();
            formatter.Serialize(fs, data);
            var barr = fs.ToArray();
            var client = new HttpClient
                {
                    BaseAddress = new Uri("http://www.yourservicelocation.com")
                };

                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(
                        new MediaTypeWithQualityHeaderValue("application/bson"));
            
                var byteArrayContent = new ByteArrayContent(barr);
                byteArrayContent.Headers.ContentType = new MediaTypeHeaderValue("application/bson");

                var result = await client.PostAsync(
                        "api/SomeData/Incoming", byteArrayContent);

                result.EnsureSuccessStatusCode();
            
        }

Answer 2

我的发现：

FormUrlEncodedContent class 不支持编码参数（因此不能正常处理土耳其语字符），所以我不得不使用 StringContent
我不得不使用 HttpUtility.UrlEncode 对表单值进行编码（并使用 ISO-8859-9 作为编码）。

这是最终代码，表单字段中的土耳其语字符没有任何问题：

var httpClient = new HttpClient(); //static readonly in real code
var iso = Encoding.GetEncoding("ISO-8859-9");

var content = new StringContent("id_6="+
    HttpUtility.UrlEncode("some text with Turkish characters öçşığüÖÇŞİĞÜ", iso), iso, 
    "application/x-www-form-urlencoded");
var response = httpClient.PostAsync(url, content).Result;//Using Result because I don't have a UI thread or the context is not ASP.NET
var responseInString = response.Content.ReadAsStringAsync().Result;
File.WriteAllText("c:\temp\a.htm", responseInString);

HttpClient.PostAsync 的字符编码问题

Character encoding problem with HttpClient.PostAsync

.net

c#

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dotnet-httpclient