c# - 查询字符串的正确编码是什么？

Question

我正在尝试从 asp.net 应用程序向“http://mysite.dk/tværs?test=æ”这样的 url 发送请求，但我无法正确编码查询字符串。或者可能查询字符串编码正确，我连接的服务无法正确理解它。

我尝试使用不同的浏览器发送请求并记录它们如何使用 Wireshark 对请求进行编码，我得到了这些结果:

Firefox: http://mysite.dk/tv%C3%A6rs?test=%E6Ie8:     http://mysite.dk/tv%C3%A6rs?test=\xe6Curl:    http://mysite.dk/tv\xe6rs?test=\xe6

Both Firefox, IE and Curl receive the correct results from the service. Note that they encode the danish special character 'æ' differently in the querystring.

When I send the request from my asp.net application using HttpWebRequest, the URL gets encoded this way:

http://mysite.dk/tv%C3%A6rs?test=%C3%A6

It encodes the querystring the same way as the path part of the url. The remote service does not understand this encoding, so I don't get a correct answer.

For the record, 'æ' (U+00E6) is %E6 in ISO-LATIN-1, and %C3%A6 in UTF-8.

I could change the remote service to accept the UTF-8 encoded querystring, but then the service would stop working in browsers and I am not really interested in that. Is there a way to specify to .NET that it shouldn't encode querystrings with UTF-8?

I am creating the webrequest like this:

var req = WebRequest.Create("http://mysite.dk/tværs?test=æ") as HttpWebRequest;

但问题似乎源自 System.Uri，它显然在 WebRequest.Create 中使用:

var uri = new Uri("http://mysite.dk/tværs?test=æ");
// now uri.AbsolutePath == "http://mysite.dk/tv%C3%A6rs?test=%C3%A6"

Answer 1

看起来您正在对整个 URL 应用 UrlEncode - 这是不正确的，路径和查询字符串的编码方式与您所见的不同。 URI WebRequest 的编码是做什么的？

您可以使用 UriBuilder 手动构建各个部分，或使用 UrlPathEncode 手动编码对于路径和 UrlEncode用于查询字符串名称和值。

编辑:

如果问题出在路径上，而不是查询字符串上，您可以尝试打开 IRI support , 通过 web.config

<configuration>
  <uri>
      <iriParsing enabled="true" />
  </uri>
</configuration>

那应该在路径中单独留下国际字符。