使用JSON发布到OData服务时，出现“错误415：不支持的媒体类型”。

解决方案位于此较长文章的底部。

我可以使用JSON进行获取，但是一旦尝试POST，我就会收到此错误。

我也可以使用XML进行GET / POST，但是我需要使用json。

我认为此错误是指我的标头中的某些内容，而不是我的请求正文的json格式（在下面也可能是错误的），我尝试了多种变体导致相同的错误。

我一直在尝试使用Fiddler进行调试，以下是结果。

JSON开机自检

请求

POST http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
User-Agent: Fiddler
Host: scdb38:8888
Content-Length: 91
Accept: application/json;odata=verbose;
Content-Type: application/json;

{
   "d":[
      {
         "Name":"Great White ",
         "Food":"Surfers"
      }
   ]
}

响应

HTTP/1.1 415 Unsupported Media Type
Cache-Control: private
Content-Length: 186
Content-Type: application/json;odata=verbose;charset=utf-8
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 16 Oct 2013 06:20:10 GMT

{"error":{"code":"1","message":{"lang":"en-AU","value":"<?xml version=\"1.0\" encoding=\"utf-16\"?><ExceptionInfo><Message>Unsupported media type requested.</Message></ExceptionInfo>"}}}

JSON GET

请求标题

GET http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
User-Agent: Fiddler
Host: scdb38:8888
Content-Length: 0
Accept: application/json;odata=verbose;
Content-Type: application/json;

响应头

HTTP/1.1 200 OK
Cache-Control: no-cache
Content-Length: 591
Content-Type: application/json;odata=verbose;charset=utf-8
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 16 Oct 2013 06:23:41 GMT

{"d":[{"__metadata":{"id":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(1)","uri":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(1)","etag":"W/\"X'00000000000007E4'\"","type":"LightSwitchApplication.Shark"},"Id":1,"RowVersion":"AAAAAAAAB+Q=","Name":"Tiger Shark","Food":"Penguins"},{"__metadata":{"id":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(2)","uri":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(2)","etag":"W/\"X'00000000000007E5'\"","type":"LightSwitchApplication.Shark"},"Id":2,"RowVersion":"AAAAAAAAB+U=","Name":"Grey Nurse","Food":"Lettuce"}]}

我不太明白为什么GET可以正常工作时POST不支持媒体类型的原因。我意识到我正在使用DataServiceVersion：1.0并已查找升级，但是我正在使用LightSwitch
2012并在引用新版本时遇到问题，而又没有破坏LightSwitch应用程序。我认为LightSwitch
2013使用的是较新的版本（？），但是对我而言，升级带来了新的（非技术性）挑战。我感觉自己正在绕过圈子，这是我的最后选择，与同事交谈后，我唯一的失败选择是在数据库上创建数据模型并在此数据库上创建OData服务。

-— 更新 -—

此后，我尝试了Jen S提供的两个修复程序，现在得到错误：400错误的请求。

使用odata = verbose

POST http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
Accept: application/json;odata=verbose;
Content-Type: application/json;odata=verbose;
Content-Length: 98
Host: scdb38:8888

{
   "d":[
      {
         "Name":"Great White ",
         "Food":"Surfers"
      }
   ]
}


HTTP/1.1 400 Bad Request
Cache-Control: private
Content-Length: 201
Content-Type: application/json;odata=verbose;charset=utf-8
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 16 Oct 2013 23:31:09 GMT

{"error":{"code":"1","message":{"lang":"en-AU","value":"<?xml version=\"1.0\" encoding=\"utf-16\"?><ExceptionInfo><Message>An error occurred while processing this request.</Message></ExceptionInfo>"}}}

使用DataServiceVersion：1.0

POST http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
Accept: application/json;odata=verbose;
Content-Type: application/json;
Content-Length: 98
Host: scdb38:8888
DataServiceVersion: 1.0;

{
   "d":[
      {
         "Name":"Great White ",
         "Food":"Surfers"
      }
   ]
}


HTTP/1.1 400 Bad Request
Cache-Control: private
Content-Length: 201
Content-Type: application/json;odata=verbose;charset=utf-8
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 16 Oct 2013 23:31:09 GMT

{"error":{"code":"1","message":{"lang":"en-AU","value":"<?xml version=\"1.0\" encoding=\"utf-16\"?><ExceptionInfo><Message>An error occurred while processing this request.</Message></ExceptionInfo>"}}}

使用WebServiceVerion：2.0

POST http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
Accept: application/json;odata=verbose;
Content-Type: application/json;
Content-Length: 98
Host: scdb38:8888
DataServiceVersion: 2.0;

{
   "d":[
      {
         "Name":"Great White ",
         "Food":"Surfers"
      }
   ]
}

HTTP/1.1 400 Bad Request
Cache-Control: private
Content-Length: 201
Content-Type: application/json;odata=verbose;charset=utf-8
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 16 Oct 2013 23:38:23 GMT

{"error":{"code":"1","message":{"lang":"en-AU","value":"<?xml version=\"1.0\" encoding=\"utf-16\"?><ExceptionInfo><Message>An error occurred while processing this request.</Message></ExceptionInfo>"}}}

我是否正在解决这个问题，这仅仅是JSON请求主体结构不正确的问题吗？我尝试了几次尝试都没有成功，但是使用XML进行发布是可行的。

----- 解决方案 ------

感谢Jen的帮助，使用json格式向OData服务发布对我来说很有效。

POST http://scdb38:8888/bi.test/applicationdata.svc/Sharks HTTP/1.1
Accept: application/json;odata=verbose;
Content-Type: application/json;
Content-Length: 62
Host: scdb38:8888
DataServiceVersion: 1.0;


 {
    "Name":"Great White ",
    "Food":"Surfers"
 }


HTTP/1.1 201 Created
Cache-Control: no-cache
Content-Length: 298
Content-Type: application/json;odata=verbose;charset=utf-8
ETag: W/"X'00000000000007E7'"
Location: http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(4)
Server: Microsoft-IIS/7.5
X-Content-Type-Options: nosniff
DataServiceVersion: 1.0;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Thu, 17 Oct 2013 23:22:12 GMT

{"d":{"__metadata":{"id":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(4)","uri":"http://scdb38:8888/BI.Test/ApplicationData.svc/Sharks(4)","etag":"W/\"X'00000000000007E7'\"","type":"LightSwitchApplication.Shark"},"Id":4,"RowVersion":"AAAAAAAAB+c=","Name":"Great White ","Food":"Surfers"}}