使用 HttpClient 将请求压缩到 asp.net 核心 2 站点的最佳方法是什么？

Question

我发送的请求可能非常大 (~1Mb)，我发现在发出请求和 asp.net 核心记录它正在处理请求之间存在很大的延迟。我想我可以通过使用 gzip 将请求压缩到 asp 来缩短时间。

下面是我在没有压缩的情况下发出请求的相当直接的方式。在客户端请求端实现 Gzip 请求压缩的正确方法是什么，一旦我在客户端实现它，我需要为服务器端做些什么？

using (HttpResponseMessage response = client.PostAsync("Controller/Action", httpContent).Result)
{
    if (response.StatusCode != System.Net.HttpStatusCode.OK)
    {

        throw new Exception(string.Format("Invalid responsecode for http request response {0}: {1}", response.StatusCode, response.ReasonPhrase));
    }
}

Answer 1

您可能需要启用压缩，如下所示

var handler = new HttpClientHandler();  
if (handler.SupportsAutomaticDecompression)  
{
    handler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
}

var client = new HttpClient(handler);

MSDN 参考：Using automatic decompression with HttpClient

Answer 2

所以我让它在服务器端使用简单的中间件，而不是在客户端做太多工作。我使用 CompressedContent.cs from WebAPIContrib，正如雷克斯在他的回答的评论中所建议的那样，并提出了如下所示的请求。整个 throw-exception-if-not-OK 是因为我使用 Polly 包裹我的请求并重试并等待策略。

客户端：

using (var httpContent = new StringContent(stringPayload, Encoding.UTF8, "application/json"))
using (var compressedContent = new CompressedContent(httpContent, "gzip"))
using (HttpResponseMessage response = client.PostAsync("Controller/Action", compressedContent).Result)
{
    if (response.StatusCode != System.Net.HttpStatusCode.OK)
    {
        throw new Exception(string.Format("Invalid responsecode for http request response {0}: {1}", response.StatusCode, response.ReasonPhrase));
    }
}

然后在服务器端我创建了一个简单的中间件，它用 Gzip 流包装请求主体流。要使用它，您需要在 Startup.cs 的 Configure 方法中的调用 app.UseMvc(); 之前添加行 app.UseMiddleware<GzipRequestMiddleware>(); 。

public class GzipRequestMiddleware { private readonly RequestDelegate next; private const string ContentEncodingHeader = "Content-Encoding"; private const string ContentEncodingGzip = "gzip"; private const string ContentEncodingDeflate = "deflate"; public GzipRequestMiddleware(RequestDelegate next) { this.next = next ?? throw new ArgumentNullException(nameof(next)); } public async Task Invoke(HttpContext context) { if (context.Request.Headers.Keys.Contains(ContentEncodingHeader) && (context.Request.Headers[ContentEncodingHeader] == ContentEncodingGzip || context.Request.Headers[ContentEncodingHeader] == ContentEncodingDeflate)) { var contentEncoding = context.Request.Headers[ContentEncodingHeader]; var decompressor = contentEncoding == ContentEncodingGzip ? (Stream)new GZipStream(context.Request.Body, CompressionMode.Decompress, true) : (Stream)new DeflateStream(context.Request.Body, CompressionMode.Decompress, true); context.Request.Body = decompressor; } await next(context); } }

使用 HttpClient 将请求压缩到 asp.net 核心 2 站点的最佳方法是什么？

What is the best way to compress a request to asp.net core 2 site using HttpClient?

c#

asp.net-web-api

dotnet-httpclient

asp.net-core-2.0