今天真的被 HttpClient 的 Headers.Authorization 给恶心到了，真的恶心了。

得吐个槽。

using (HttpClient cli = HttpClientFactory.Create()) {
    cli.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue($"API-PROXY-AUTH;version=1.0,timestamp={stmp},appid={appid},sign={sign}");
    cli.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(" ",$"API-PROXY-AUTH;version=1.0,timestamp={stmp},appid={appid},sign={sign}");
    cli.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("",$"API-PROXY-AUTH;version=1.0,timestamp={stmp},appid={appid},sign={sign}");
    cli.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(null,$"API-PROXY-AUTH;version=1.0,timestamp={stmp},appid={appid},sign={sign}");
var hd = cli.PostAsync($"http://{addr}/api-proxy/v1/callback/call", new StringContent("mydata")).Result;
}

如上，各种尝试都是不行。

后来看 AuthenticationHeaderValue 的代码，才发现 AuthenticationHeaderValue 的构造函数必须传入非空的参数（空格都不行）·scheme·，而且还要检查字符，一堆字符不能被包含

        [__DynamicallyInvokable]
        public AuthenticationHeaderValue(string scheme)
            : this(scheme, null) {
        }

        [__DynamicallyInvokable]
        public AuthenticationHeaderValue(string scheme, string parameter) {
            HeaderUtilities.CheckValidToken(scheme, "scheme");
            this.scheme = scheme;
            this.parameter = parameter;
        }

namespace System.Net.Http.Headers {
    internal static class HeaderUtilities {
        internal static void CheckValidToken(string value, string parameterName) {
            if (string.IsNullOrEmpty(value)) {
                throw new ArgumentException(SR.net_http_argument_empty_string, parameterName);
            }

            if (HttpRuleParser.GetTokenLength(value, 0) != value.Length) {
                throw new FormatException(string.Format(CultureInfo.InvariantCulture, SR.net_http_headers_invalid_value, value));
            }
        }

namespace System.Net.Http {
    internal static class HttpRuleParser {
        static HttpRuleParser() {
            tokenChars = new bool[128];
            for (int i = 33; i < 127; i++) {
                tokenChars[i] = true;
            }
//一堆字符检测，都属于非法字符，比如空格、逗号、等于号、分号、括号等等
            tokenChars[40] = false;
            tokenChars[41] = false;
            tokenChars[60] = false;
            tokenChars[62] = false;
            tokenChars[64] = false;
            tokenChars[44] = false;
            tokenChars[59] = false;
            tokenChars[58] = false;
            tokenChars[92] = false;
            tokenChars[34] = false;
            tokenChars[47] = false;
            tokenChars[91] = false;
            tokenChars[93] = false;
            tokenChars[63] = false;
            tokenChars[61] = false;
            tokenChars[123] = false;
            tokenChars[125] = false;
        }

        internal static bool IsTokenChar(char character) {
            if (character > '\u007f') {
                return false;
            }

            return tokenChars[character];
        }

        internal static int GetTokenLength(string input, int startIndex) {
            if (startIndex >= input.Length) {
                return 0;
            }

            for (int i = startIndex; i < input.Length; i++) {
                if (!IsTokenChar(input[i])) {
                    return i - startIndex;
                }
            }

            return input.Length - startIndex;
        }

参考了 msdn-doc 也没看到说有限制的，却在使用的时候给限制了。。。。。。。

后来，换用了 HttpWebRequest ， 想写啥就写啥。

确实有些不理解。