request payload的Content-Type实际上是text/plain的，如果请求的 Content-Type 为 application/json，这将导致415 Unsupported Media Type HTTP error。
有两个解决方法
1使用 application/json
Content-Type采用application/json并确保 request payload是有效的json格式，比如
1 {
2 "cookie": "value"
3 }
Then the action signature needs to accept an object with the same shape as the JSON object.
创建实体作为接收参数
1 public class CookieWrapper
2 {
3 public string Cookie { get; set; }
4 }
5
6 ...
7
8 public IActionResult GetRankings([FromBody] CookieWrapper c)
或者使用dynamic、Dictionary
1 public IActionResult GetRankings([FromBody] dynamic c) 2 3 public IActionResult GetRankings([FromBody] Dictionary<string, string> c)
2使用 text/plain
客户端请求使用 Content-Type ： text/plain，服务端添加TextPlainInputFormatter
1 public class TextPlainInputFormatter : TextInputFormatter
2 {
3 public TextPlainInputFormatter()
4 {
5 SupportedMediaTypes.Add("text/plain");
6 SupportedEncodings.Add(UTF8EncodingWithoutBOM);
7 SupportedEncodings.Add(UTF16EncodingLittleEndian);
8 }
9
10 protected override bool CanReadType(Type type)
11 {
12 return type == typeof(string);
13 }
14
15 public override async Task<InputFormatterResult> ReadRequestBodyAsync(
16 InputFormatterContext context,
17 Encoding encoding)
18 {
19 string data = null;
20 using (var streamReader = context.ReaderFactory(
21 context.HttpContext.Request.Body,
22 encoding))
23 {
24 data = await streamReader.ReadToEndAsync();
25 }
26
27 return InputFormatterResult.Success(data);
28 }
29 }
并在Startup.cs配置mvc
1 services.AddMvc(options =>
2 {
3 options.InputFormatters.Add(new TextPlainInputFormatter());
4 });