C# 去掉 WebClient 中的 Connection 头
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C# get rid of Connection header in WebClient
提问by Unknown
I'm using the C# using the WebClient().
我正在使用 C# 使用 WebClient()。
I was testing out what headers are sent, and I noticed that the following header is automatically added.
我正在测试发送了哪些标头，我注意到自动添加了以下标头。
Connection : Keep-Alive
Is there any way to remove this?
有什么办法可以去掉这个吗？
回答by Jon Skeet
Use HttpWebRequestinstead of WebClient(it's slightlyless convenient, but not by very much) and set the KeepAliveproperty to false.
使用HttpWebRequest代替WebClient（稍微不太方便，但不是很方便）并将KeepAlive属性设置为false.
I haven't tested this - it's possiblethat it'll just change the value of the Connection header instead of removing it - but it's worth a try. The docs for the Connectionproperty at least suggestthat it only adds Keep-Alive.
我还没有测试过这个 - 它可能只是改变 Connection 标头的值而不是删除它 - 但值得一试。该Connection属性的文档至少表明它只添加了 Keep-Alive。
回答by Redha
I had ran into the same issue this morning. Following on Skeet's hint, it can be achieved by passing HttpWebRequestto WebClientby inheriting it:
我今天早上遇到了同样的问题。按照 Skeet 的提示，可以通过继承来传递HttpWebRequestto来实现WebClient：
class MyWebClient : WebClient
{
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest request = base.GetWebRequest(address);
if (request is HttpWebRequest)
{
(request as HttpWebRequest).KeepAlive = false;
}
return request;
}
}
Now sent headers will include Connection : close
现在发送的标头将包括Connection : close
