.NET 4.8 ASP.NET Swagger SwashBuckle 请求包含实体主体，但没有 Content-Type 标头。 不支持媒体类型应用程序/八位字节流

Question

您好，我在使用 .NET Framework 4.8 配置/测试 Swashbuckle/Swagger 5.6.0 时遇到问题（ASP.NET [不是 ASP.NET Core！ ]）

从 WebUI Swagger 测试 GET 方法会引发错误。

对邮递员做同样的事情是：

• 内容类型：“应用程序/json” - 好的

• Content-Type: "application/ocet-stream" - 同样的错误

响应正文错误：

Message: "The request contains an entity body but no Content-Type header. The inferred media type 'application/octet-stream' is not supported for this resource.",
ExceptionMessage: "No MediaTypeFormatter is available to read an object of type 'SomeParams' from content with media type 'application/octet-stream'.",
ExceptionType: "System.Net.Http.UnsupportedMediaTypeException",
StackTrace: "   w System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)\r\n   w System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request, Type type, IEnumerable`1 formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)"

看起来缺少 Request Content-Type 标头存在问题，我无法在 SwaggerWebUI 中正确设置它。

ASP.NET Swashbuckle 中没有Produces / Consumes属性，因此我按照以下说明手动添加它们（customattribute + customfilters + 在 SwaggerConfig.cs 中注册）： https ://blog.kloud.com.au/2017/08/04/swashbuckle -pro-tips-for-aspnet-web-api-part-1/但它不起作用并且参数内容类型组合框没有出现。

我还尝试使用/不使用全局/普通格式化程序添加/清除 SupportedMediaTTypes 等来编辑WebApiConfig.cs 。

    //config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new System.Net.Http.Headers.MediaTypeHeaderValue("application/json"));

    var mediaType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");

    var formatter = new System.Net.Http.Formatting.JsonMediaTypeFormatter();
    formatter.SupportedMediaTypes.Clear();
    formatter.SupportedMediaTypes.Add(mediaType);

    
    config.Formatters.Clear();
    config.Formatters.Add(formatter);

    var jsonFormatter = new System.Net.Http.Formatting.JsonMediaTypeFormatter();
    jsonFormatter.SupportedMediaTypes.Clear();
    jsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));

    GlobalConfiguration.Configuration.Formatters.Add(jsonFormatter);

    config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
    config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/xml"));

示例控制器代码：

using System.Collections.Generic;
using System.Linq;
using System.Web.Http;
namespace MainClass
{
    public class xxx_V1Controller : ApiController
    {
        [HttpGet]
        [SwaggerConsumes("application/json")]
        [SwaggerProduces("application/json")]
        [Route("api/xxx_V1/GetAll/", Name = "xxx_V1_GetAll")]
        public Rxxx_V1 GetAll(SomeParamsXyz)
        {
            return AuthorizationController.MainClass.yyy_GetAll_V1(SomeParams xyz);
        }

        [HttpGet]
        [Route("api/xxx_V1/GetAll2/", Name = "xxx_V1_GetAll2")]
        public Rxxx_V1 GetAll2(SomeParams xyz)
        {
            return AuthorizationController.MainClass.yyy_GetAll2_V1(SomeParams xyz);
        }
    }
}

SomeParams 类

public class SomeParams : IXyz, IFilters
{
   public string XXX { get; set; }
   public bool GetCountOnly { get; set; }
   public bool YYY{ get; set; }
   public LoadOptions Options { get; set; }
   public List<Filter> Filters { get; set; }
}

http://localhost:20220/swagger/docs/v1 片段：

"/api/xxx_V1/GetAll": {
    "get": {
        "tags": [
            "xxx_V1"
        ],
        "operationId": "xxx_V1_GetAll",
        "consumes": [
            "application/json"
        ],
        "produces": [
            "application/json"
        ],
        "parameters": [
            {
                "name": "options.xxx",
                "in": "query",
                "required": false,
                "type": "string"
            },
            {
                "name": "options.getCountOnly",
                "in": "query",
                "required": false,
                "type": "boolean"
            },
            {
                "name": "options.YYY",
                "in": "query",
                "required": false,
                "type": "boolean"
            },
            {
                "name": "options.options.getCountOnly",
                "in": "query",
                "required": false,
                "type": "boolean"
            },
            {
                "name": "options.options.YYY",
                "in": "query",
                "required": false,
                "type": "boolean"
            },
            {
                "name": "options.filters",
                "in": "query",
                "required": false,
                "type": "array",
                "items": {},
                "collectionFormat": "multi"
            }
        ],
        "responses": {
            "200": {
                "description": "OK",
                "schema": {
                    "$ref": "#/definitions/xxxx.Objects.Rxxx_V1"
                }
            }
        }
    }
},

自定义过滤器消耗/生产可能正常工作，因为没有这些属性的所有其他 Get 方法也具有带有 application/xml 的 json。

"consumes": [
  "application/json",
  "application/xml"
],
"produces": [
  "application/json",
  "application/xml"
],