无法在 HttpFormUrlEncodedContent 上设置 Headers

Question

我正在使用 Windows.Web.Http.HttpClient.SendRequestAsync 和 post HttpFormUrlEncodedContent 以及一些自定义 headers。

尝试时：

HttpClient httpClient = new HttpClient();

IList<KeyValuePair<string, string>> requestData = new List<KeyValuePair<string, string>>();
requestData.Add(new KeyValuePair<string, string>("form", "content"));
HttpFormUrlEncodedContent request = new HttpFormUrlEncodedContent(requestData);

request.Headers.TryAppendWithoutValidation("Custom", "Header");

我遇到异常：

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

如何使用 HttpFormUrlEncodedContent 添加 per-request 自定义 headers？

请注意，虽然我知道 HttpClient.DefaultRequestHeaders，但这不是一个很好的选择，因为我想重用 HttpClient 实例。

Answer 1

所以您实际上无法将 Headers 设置为内容本身。事实证明，您需要将 HttpFormUrlEncodedContent 包装在 HttpRequestMessage 中，然后将 headers 设置为 HttpRequestMessage object，如下所示：

HttpFormUrlEncodedContent content = new HttpFormUrlEncodedContent(requestData);
HttpRequestMessage req = new HttpRequestMessage(HttpMethod.Post, ServiceUri);
req.Content = content;
req.Headers.Add("Custom", "Header");

无法在 HttpFormUrlEncodedContent 上设置 Headers

Cannot set Headers on HttpFormUrlEncodedContent

c#

httpclient