如何压缩HTTP GET响应?

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我目前正在将少数MVC3控制器迁移到MVC4 Api控制器。我通过inherting ActionFilterAttribute和overriding方法实现了MVC3控制器Get方法响应的压缩机制OnActionExecutiong。经过一番研究,我发现我需要使用ActionFilterMethodfrom System.Web.HttpFilters。如果有人可以分享一段示例代码,让我开始使用GZip压缩HTTP响应,那将是非常好的

提问于
用户回答回答于

最简单的方法是直接在IIS级别启用压缩

如果你想在应用程序级别执行此操作,则可以编写自定义委派消息处理程序,如以下文章所示:

public class CompressHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        return base.SendAsync(request, cancellationToken).ContinueWith<HttpResponseMessage>((responseToCompleteTask) =>
        {
            HttpResponseMessage response = responseToCompleteTask.Result;

            if (response.RequestMessage.Headers.AcceptEncoding != null)
            {
                string encodingType = response.RequestMessage.Headers.AcceptEncoding.First().Value;

                response.Content = new CompressedContent(response.Content, encodingType);
            }

            return response;
        },
        TaskContinuationOptions.OnlyOnRanToCompletion);
    }
}

public class CompressedContent : HttpContent
{
    private HttpContent originalContent;
    private string encodingType;

    public CompressedContent(HttpContent content, string encodingType)
    {
        if (content == null)
        {
            throw new ArgumentNullException("content");
        }

        if (encodingType == null)
        {
            throw new ArgumentNullException("encodingType");
        }

        originalContent = content;
        this.encodingType = encodingType.ToLowerInvariant();

        if (this.encodingType != "gzip" && this.encodingType != "deflate")
        {
            throw new InvalidOperationException(string.Format("Encoding '{0}' is not supported. Only supports gzip or deflate encoding.", this.encodingType));
        }

        // copy the headers from the original content
        foreach (KeyValuePair<string, IEnumerable<string>> header in originalContent.Headers)
        {
            this.Headers.AddWithoutValidation(header.Key, header.Value);
        }

        this.Headers.ContentEncoding.Add(encodingType);
    }

    protected override bool TryComputeLength(out long length)
    {
        length = -1;

        return false;
    }

    protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
    {
        Stream compressedStream = null;

        if (encodingType == "gzip")
        {
            compressedStream = new GZipStream(stream, CompressionMode.Compress, leaveOpen: true);
        }
        else if (encodingType == "deflate")
        {
            compressedStream = new DeflateStream(stream, CompressionMode.Compress, leaveOpen: true);
        }

        return originalContent.CopyToAsync(compressedStream).ContinueWith(tsk =>
        {
            if (compressedStream != null)
            {
                compressedStream.Dispose();
            }
        });
    }
}

现在剩下的就是注册处理程序Application_Start

GlobalConfiguration.Configuration.MessageHandlers.Add(new CompressHandler());
用户回答回答于

如果你使用的是IIS 7+,我会说压缩到IIS,因为它支持GZIP压缩。只需打开它

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