asp.net core webapi處理Post請求中的request payload

request payload的Content-Type實際上是text/plain的，如果請求的 Content-Type 為 application/json，這將導致415 Unsupported Media Type HTTP error。

有兩個解決方法

1使用  application/json

Content-Type采用application/json並確保 request payload是有效的json格式，比如

 { 2     "cookie": "value"
} 

Then the action signature needs to accept an object with the same shape as the JSON object.

創建實體作為接收參數

public class CookieWrapper
{
    public string Cookie { get; set; }
}

...

public IActionResult GetRankings([FromBody] CookieWrapper c)

 

或者使用dynamic、Dictionary

public IActionResult GetRankings([FromBody] dynamic c) 

public IActionResult GetRankings([FromBody] Dictionary<string, string> c) 

 

2使用 text/plain

客戶端請求使用 Content-Type ： text/plain，服務端添加TextPlainInputFormatter

public class TextPlainInputFormatter : TextInputFormatter
{
    public TextPlainInputFormatter()
    {
        SupportedMediaTypes.Add("text/plain");
        SupportedEncodings.Add(UTF8EncodingWithoutBOM);
        SupportedEncodings.Add(UTF16EncodingLittleEndian);
    }

    protected override bool CanReadType(Type type)
    {
        return type == typeof(string);
    }

    public override async Task<InputFormatterResult> ReadRequestBodyAsync(
        InputFormatterContext context, 
        Encoding encoding)
    {
        string data = null;
        using (var streamReader = context.ReaderFactory(
            context.HttpContext.Request.Body, 
            encoding))
        {
            data = await streamReader.ReadToEndAsync();
        }

        return InputFormatterResult.Success(data);
    }
}

並在Startup.cs配置mvc

services.AddMvc(options =>
{
    options.InputFormatters.Add(new TextPlainInputFormatter());
});

 

 翻譯自https://stackoverflow.com/questions/41798814/asp-net-core-api-post-parameter-is-always-null

 

 

作者：B.it

 

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