不能设置的Htt presponseMessage头Content-Type头？ [英] Can't set Content-Type header on HttpResponseMessage headers?

问题描述

我使用ASP.NET的WebAPI创建一个RESTful API。我在我的控制器之一中创建一个PUT方法和code是这样的：

I'm using the ASP.NET WebApi to create a RESTful API. I'm creating a PUT method within one of my controllers, and the code looks like this:

public HttpResponseMessage Put(int idAssessment, int idCaseStudy, string value) {
    var response = Request.CreateResponse();
    if (!response.Headers.Contains("Content-Type")) {
        response.Headers.Add("Content-Type", "text/plain");
    }

    response.StatusCode = HttpStatusCode.OK;
    return response;
}

当我把与通过AJAX的浏览器的位置，它给了我这样的异常：

When I PUT to that location with the browser via AJAX, it gives me this Exception:

误用头名。确保请求头与使用
  HTT prequestMessage，响应头与HTT presponseMessage和
  内容头部与HttpContent对象。

Misused header name. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.

但不是内容类型的回应是非常有效的头？为什么我会收到此异常？

But isn't Content-Type a perfectly valid header for a response? Why am I getting this exception?

推荐答案

有一个看的HttpContentHeaders.ContentType物业：

response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/plain");

---

if (response.Content == null)
{
    response.Content = new StringContent("");
    // The media type for the StringContent created defaults to text/plain.
}

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