Windows HttpClient 响应标头无效字符

Question

我正在使用 HttpClient postAsync 方法来发布和检索 json。它就像一个魅力。 但是如果服务器在响应头的任何字段中返回“Ö”字符，它就会抛出异常。

System.ArgumentException ---> System.ArgumentException: [net_WebHeaderInvalidControlChars]
Arguments:
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.7.60408.0&File=System.Net.dll&Key=net_WebHeaderInvalidControlChars
Parameter name: name
   at System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
   at System.Net.Browser.ClientHttpWebRequest.<>c__DisplayClasse.<EndGetResponse>b__d(Object sendState)
   at System.Net.Browser.AsyncHelper.<>c__DisplayClass1.<BeginOnUI>b__0(Object sendState)
   --- End of inner exception stack trace ---
   at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
   at System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
--- End of stack trace from previous location where exception was thrown ---
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

Answer 1

HTTP 标头仅是 ASCII。参见 RFC：https://www.rfc-editor.org/rfc/rfc2616

Header 中的 Umlaute 只是协议违规，会抛出异常。