HttpClient中异常 ‘The format of value ‘application/json；charset=UTF-8‘ is invalid.

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具体原因参考于17036

四种HttpContext实例

MultipartFormDataContent : multipart/form-data

FormUrlEncodedContent : application/x-www-form-urlencoded

StringContent : application/json 等

StreamContent : binary

设置示例

var content = new StringContent(param, Encoding.UTF8, "application/json");
content.Headers.ContentType.CharSet = "UTF-8";

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