C# 如何在单个请求的 HttpWebRequest 中禁用“Expect: 100 continue”标头？
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How to disable the "Expect: 100 continue" header in HttpWebRequest for a single request?
提问by Roman Starkov
HttpWebRequestautomatically appends an Expect: 100-continueheader for POST requests. Various sources around the internet suggest that this can be disabled as follows:
HttpWebRequest自动Expect: 100-continue为 POST 请求附加一个标头。互联网上的各种来源表明，可以按如下方式禁用此功能：
System.Net.ServicePointManager.Expect100Continue = false;
However, I'm writing a library and I cannot disable this for the entire appdomain, in case the application relies on this behaviour. Nor can I assume that it will remain set to this value. How can I disable it for a specific request?
但是，我正在编写一个库，我无法为整个应用程序域禁用它，以防应用程序依赖此行为。我也不能假设它会保持设置为这个值。如何针对特定请求禁用它？
采纳答案by Roman Starkov
The HttpWebRequestclass has a property called ServicePointwhich can be used to change this setting for a specific request. For example:
的HttpWebRequest类有一个称为属性ServicePoint，其可以用来改变此设置的特定请求。例如：
var req = (HttpWebRequest) WebRequest.Create(...);
req.ServicePoint.Expect100Continue = false;
回答by AroglDarthu
If you also need to set a proxy, make sure to do that first. Otherwise Expect100Continuewill be reverted to trueagain. So:
如果您还需要设置代理，请务必先执行此操作。否则Expect100Continue将再次恢复为true。所以：
HttpWebRequest webRequest = WebRequest.CreateHttp(_url);
webRequest.Proxy = new WebProxy(_proxyHost, _proxyPort);
webRequest.ServicePoint.Expect100Continue = false;
