利用 ActionFilter 为 ASP.NET Web API 添加 GZip 压缩功能

直接上代码

public class DeflateCompressionAttribute : ActionFilterAttribute { public override void OnActionExecuted(HttpActionExecutedContext actContext) { var contentType = actContext.Response.Content.Headers.ContentType.ToString(); var content = actContext.Response.Content; var bytes = content == null ? null : content.ReadAsByteArrayAsync().Result; var zlibbedContent = bytes == null ? new byte[0] : CompressionHelper.DeflateByte(bytes); actContext.Response.Content = new ByteArrayContent(zlibbedContent); actContext.Response.Content.Headers.Remove("Content-Type"); actContext.Response.Content.Headers.Add("Content-encoding", "deflate"); actContext.Response.Content.Headers.Add("Content-Type", contentType); base.OnActionExecuted(actContext); } } public class CompressionHelper { public static byte[] DeflateByte(byte[] str) { if (str == null) { return null; } using (var output = new MemoryStream()) { using (var compressor = new Ionic.Zlib.DeflateStream(output, Ionic.Zlib.CompressionMode.Compress, Ionic.Zlib.CompressionLevel.BestSpeed)) { compressor.Write(str, 0, str.Length); } return output.ToArray(); } } }

使用 DeflateCompression 来标记需要压缩的 Web API

public class V1Controller : ApiController { [DeflateCompression] public HttpResponseMessage GetCustomers() { } }

备注

增加对 Request 中 Accept-Encoding 设定的判断，如果客户端请求包含压缩请求才进行压缩示例利用了第三方库来进行，可以视情况来自定义替换为其他库