带有自定义头的C#HttpClient POST请求发送不正确的内容类型头字段

Question

我在Windows10上的VisualStudio中用C#编写了一个示例代码，该代码试图将带有自定义头的POST请求发送到运行在的服务http://localhost:9998这是失败的。

当我查看请求时，内容类型标题字段将作为ContentType（无连字符）发送。

httpRequestMessage:方法：POST，请求URI:'http://localhost:9998/，版本：1.1，内容：系统。网Http。ByteArrayContent，标题：{
ContentType:application/vnd.com.documents4j.any-msword Accept:application/pdf转换器作业优先级：1000}响应：状态代码：500，原因短语：“请求失败”，版本：1.1，内容：系统。网Http。流内容，标题：{连接：关闭日期：星期六，2021年4月10日22:39：24GMT内容长度：1031内容类型：文本/HTML；字符集= ISO-8591-1}按任意键继续…

我想知道这是否是问题的原因？

我有用C#编写的代码，使用RestSharp，正确发送Content-Type并返回成功的结果。我有写在Java的代码，也正确发送Content-Type并返回一个成功的结果。

示例代码1[发送ContentType为ContentType的问题]

using System;
using System.Net;
using System.IO;
using System.Net.Http;

namespace HttpPOST10
{
    class Program
    {
        public static string MyUri { get; private set; }
        static void Main(string[] args)
        {
//            string url = "http://localhost:9998";
            string url = "http://localhost:8888"; // Fiddler
            Uri myUri = new Uri(url);
            string srcFilename = @"C:\temp2\Sample.doc";
            string destFileName = @"C:\temp3\Sample-HttpPOST10.pdf";

            UploadFile(url, srcFilename, destFileName);
        }
        private static bool UploadFile(string url, string srcFilename, string destFileName)
        {
            HttpClient httpClient = new HttpClient();
            byte[] data;
            data = File.ReadAllBytes(srcFilename);
            var httpRequestMessage = new HttpRequestMessage
            {
                Method = HttpMethod.Post,
                RequestUri = new Uri(url),
                Headers = {
                    { HttpRequestHeader.ContentType.ToString(), "application/vnd.com.documents4j.any-msword" },
                    { HttpRequestHeader.Accept.ToString(), "application/pdf" },
                    { "Converter-Job-Priority", "1000" },
//                    {"User-Agent",  "RestSharp/106.11.8.0" }
                },
                Content = new ByteArrayContent(data)
            };
            Console.Write("httpRequestMessage:" + httpRequestMessage);
            var response = httpClient.SendAsync(httpRequestMessage).Result;
            Console.Write("response:" + response);

            return true;
        }
    }
}

Answer 1

谢谢吉米——现在得到了成功的回应。

http://localhost:9998/，版本：1.1，内容：系统。网。http：//http.ByteArrayContent， Headers：{
ContentType： Application/vnd.com.documents4j.any-mword接受： Application/pdf转换器-作业-优先级： 1000 Content-Type： Application/vnd.com.documents4j.any-mword}响应： StatusCode： 200，原因短语：'OK'，版本： 1.1，内容：系统。网。http：//http.StreamContent，标头：{不同：接受-编码
传输-编码：组块日期：周一，4月12日2021 03:04:14格林尼治标准时间
内容类型：应用/pdf

代码更改为：

private static bool UploadFile(string url, string srcFilename, string destFileName)
{
    HttpClient httpClient = new HttpClient();
    byte[] data;
    data = File.ReadAllBytes(srcFilename);

    HttpContent content = new ByteArrayContent(data);
    content.Headers.Add("Content-Type", "application/vnd.com.documents4j.any-msword");

    var httpRequestMessage = new HttpRequestMessage
    {
        Method = HttpMethod.Post,
        RequestUri = new Uri(url),
        Headers = {
            { HttpRequestHeader.ContentType.ToString(), "application/vnd.com.documents4j.any-msword" },
            { HttpRequestHeader.Accept.ToString(), "application/pdf" },
            { "Converter-Job-Priority", "1000" },
        },
        Content = content
    };

    Console.Write("httpRequestMessage:" + httpRequestMessage);
                var response = httpClient.SendAsync(httpRequestMessage).Result;
    Console.Write("response:" + response);

    return true;
}