.Net Web API PUT和POST停止工作-415不支持的媒体类型

如何解决.Net Web API PUT和POST停止工作-415不支持的媒体类型

使用.NET Framework 4.7.2时，.NET API中的Web API POST和PUT存在问题

我有一个已经运行了几年的Web API，最近我们分支了代码以发布新版本。所有的GET仍然可以正常工作，但是PUT和POST现在在Postman和Swagger中变得异常糟糕。

我很机智，我不知道为什么GET可以正常工作，但是PUT和POST告诉我请求包含实体实体，但是没有内容类型标头（415不支持的媒体类型）...但是他们在那里！ （请参阅下面的原始请求）

我尝试了标题中Content-Type，Accept等的每种组合。

这是一个测试API调用和模型：

public class TestOfPutModel
{
  public string strValue1 { get; set; }
  public string strValue2 { get; set; }
  public bool blnValue3 { get; set; }
}

[Route("v1.0/TestPutOfModel/{id}")]
[System.Web.Http.HttpPut]
public HttpResponseMessage TestOfPut(Guid id,[FromBody] TestOfPutModel putMdl)
{
          List<TestOfPutModel> returnValue = new List<TestOfPutModel>();
          TestOfPutModel pm1;
          if (putMdl == null)
          {
            pm1 = new TestOfPutModel
            {
              strValue1 = id.ToString(),strValue2 = $"passed in model- str1: null str2: null bln3: null",blnValue3 = true
            };
          }
          else
          {
            pm1 = new TestOfPutModel
            {
              strValue1 = id.ToString(),strValue2 = $"passed in model- str1: {putMdl.strValue1} str2: {putMdl.strValue2} bln3: {putMdl.blnValue3}",blnValue3 = true
            };
          }

      TestOfPutModel pm2 = new TestOfPutModel
      {
        strValue1 = id.ToString(),strValue2 = "just some text value",blnValue3 = false
      };

      returnValue.Add(pm1);
      returnValue.Add(pm2);
      return Request.CreateResponse(HttpStatusCode.OK,returnValue);
}

这是Fiddler从我的邮递员电话发出的原始请求：

    PUT http://localhost:55459/v1.0/TestPutOfModel/1cdc015c-1d76-46f1-a6e0-c8788830f980 HTTP/1.1
    Content-Type: application/json; charset=utf-8
    Authorization: Basic XXXXXXXXX
    User-Agent: PostmanRuntime/7.26.8
    Accept: */*
    Cache-Control: no-cache
    Host: localhost:55459
    Accept-Encoding: gzip,deflate,br
    Connection: keep-alive
    Content-Length: 85
    Cookie: ASP.NET_SessionId=2jewzo0zmsgedisv0bdbpt5b

    {
      "strValue1": "string1111","strValue2": "string2222","blnValue3": true
    }

我用招摇和邮递员收到此错误消息：

    {
    "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 'TestOfPutModel' from content with media type 'application/octet-stream'.","ExceptionType": "System.Net.Http.UnsupportedMediaTypeException","StackTrace": "   at System.Net.Http.HttpContentExtensions.ReadAsAsync[T](HttpContent content,Type type,IEnumerable`1 formatters,IFormatterLogger formatterLogger,CancellationToken cancellationToken)\r\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.ReadContentAsync(HttpRequestMessage request,CancellationToken cancellationToken)"
    }
    

如果在邮递员中，我将请求正文更改为“ none”，“ form-data”或“ x-www-form-urlencoded”，则该调用有效，但按预期，该模型为空。

    {
        "strValue1": "1cdc015c-1d76-46f1-a6e0-c8788830f980","strValue2": "passed in model- str1: null str2: null bln3: null","blnValue3": true
    },{
        "strValue1": "1cdc015c-1d76-46f1-a6e0-c8788830f980","strValue2": "just some text value","blnValue3": false
    }

但是，使用'form-data'或'x-www-form-urlencoded'并放入键/值对将导致相同的414 No Content-Type Header错误。

PUT http://localhost:55459/v1.0/TestPutOfModel/1cdc015c-1d76-46f1-a6e0-c8788830f980 HTTP/1.1
Content-Type: application/json; charset=utf-8
Authorization: Basic XXXXXXXX
User-Agent: PostmanRuntime/7.26.8
Accept: */*
Cache-Control: no-cache
Host: localhost:55459
Accept-Encoding: gzip,br
Connection: keep-alive
Content-Length: 42
Cookie: ASP.NET_SessionId=2jewzo0zmsgedisv0bdbpt5b

strValue1=ttt&strValue2=uuu&blnValue3=true