如何在ServiceStack ProxyFeature中正确解码响应流？

Question

我试图替换ProxyFeature中的响应正文中的URL，但我得到一个编码的正文。

这是代码：

Plugins.Add(new ProxyFeature(
          matchingRequests: req =>
          {
            return req.PathInfo.StartsWith("/proxy");
          },
          resolveUrl: (req) =>
          {
            string var = req.RawUrl.Replace("/proxy/", "");
            return var;
          })
      {
        IgnoreResponseHeaders = {
                    "X-Frame-Options"
                },
        TransformResponse = async (res, responseStream) =>
        {          
          using (var reader = new StreamReader(responseStream,Encoding.UTF8))
          {
            var responseBody = await reader.ReadToEndAsync();
            Console.WriteLine(responseBody);
            var replacedBody = responseBody.Replace("http://","/proxy/http://");
            replacedBody = replacedBody.Replace("https://", "/proxy/https://");

            return MemoryStreamFactory.GetStream(replacedBody.ToUtf8Bytes());
          }
        }

我不确定我做错了什么，因为这或多或少是网站中示例代码的副本，只有很小的改动。

结果应该是正文中的所有URL都应该以“/ proxy /”为前缀，这应该应用于用户导航到的任何URL。

值得一提的是，如果删除“TransformResponse”部分，这种方法就足够了。

关于我在这里做错了什么的任何想法。

谢谢。

更新：

返回的部分内容。在这种情况下导航的网址是“https://www.theverge.com”。

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Answer 1

乱码输出是因为正在返回的下游响应被压缩但您尝试直接将其作为字符串读取。

如果代理响应被压缩，则需要对其进行解压缩，进行任何字符串转换然后将其压缩，例如：

Plugins.Add(new ProxyFeature(
    matchingRequests: req => req.PathInfo.StartsWith("/proxy"),
    resolveUrl: req => req.RawUrl.Replace("/proxy/", ""))
{
    IgnoreResponseHeaders = { "X-Frame-Options" },
    TransformResponse = async (res, responseStream) => {
        var enc = res.GetHeader(HttpHeaders.ContentEncoding);
        var useStream = responseStream;
        if (enc != null)
            useStream = responseStream.Decompress(enc);

        using (var reader = new StreamReader(useStream,Encoding.UTF8))
        {
            var responseBody = await reader.ReadToEndAsync();
            var replacedBody = responseBody.Replace("http://","/proxy/http://");
            replacedBody = replacedBody.Replace("https://", "/proxy/https://");

            var bytes = replacedBody.ToUtf8Bytes();
            return new MemoryStream(enc != null ? bytes.CompressBytes(enc) : bytes);
        }
    }
});