【HttpClient】HttpRequestHeaders.From提示The specified value is not a valid 'From' header string.

前言

报错原因：From需要是邮件地址的格式。

协议头	说明	示例	状态
From	发起此请求的用户的邮件地址	From: user@itbilu.com	固定

参考：

https://blog.csdn.net/m0_37730732/article/details/82263609

https://itbilu.com/other/relate/EJ3fKUwUx.html#http-request-headers

http://www.iana.org/assignments/message-headers/message-headers.xhtml

代码

            HttpRequestMessage httpRequestMessage = new HttpRequestMessage();
            httpRequestMessage.Headers.Add("from", "mywork");
            httpRequestMessage.Headers.Add("timestamp", timestamp);
            httpRequestMessage.Headers.Add("signature", signature);
            httpRequestMessage.Headers.Add("client-name", client_name);
            httpRequestMessage.Method = HttpMethod.Get;
            httpRequestMessage.RequestUri = new Uri(Domain + requestUrl);

            HttpResponseMessage response = await _client.SendAsync(httpRequestMessage);

            string r = string.Empty;

            if (response.IsSuccessStatusCode)
                r = await response.Content.ReadAsStringAsync();

            return r;

错误信息

The format of value 'mywork' is invalid.

   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index)
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)

解决办法

目前没找到合适的处理方式，暂时使用HttpWebRequest请求

        public static string HttpGet(string url, string Accept, string ContentType, Dictionary<string, string> headers)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";

            if (Accept.NotEmpty())
                request.Accept = Accept;

            if (ContentType.NotEmpty())
                request.ContentType = ContentType;

            if (headers != null)
                foreach (KeyValuePair<string, string> item in headers)
                {
                    request.Headers.Add(item.Key, item.Value);
                }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }