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  • WebApi2官网学习记录---批量处理HTTP Message

    原文:Batching Handler for ASP.NET Web API

    1. 自定义实现HttpMessageHandler

         public class BatchHandler : HttpMessageHandler
           {
               HttpMessageInvoker _server;
       
               public BatchHandler(HttpConfiguration config)
               {
                   _server = new HttpMessageInvoker(new HttpServer(config));
               }
       
               protected override async Task<HttpResponseMessage> SendAsync(
                   HttpRequestMessage request,
                   CancellationToken cancellationToken)
               {
                   // Return 400 for the wrong MIME type
                   if ("multipart/batch" !=
                       request.Content.Headers.ContentType.MediaType)
                   {
                       return request.CreateResponse(HttpStatusCode.BadRequest);
                   }
       
                   // Start a multipart response 
                   var outerContent = new MultipartContent("batch");
                   var outerResp = request.CreateResponse();
                   outerResp.Content = outerContent;
       
                   // Read the multipart request
                   var multipart = await request.Content.ReadAsMultipartAsync();
       
                   foreach (var httpContent in multipart.Contents)
                   {
                       HttpResponseMessage innerResp = null;
       
                       try
                       {
                           // Decode the request object
                           var innerReq = await
                               httpContent.ReadAsHttpRequestMessageAsync();
       
                           // Send the request through the pipeline
                           innerResp = await _server.SendAsync(
                               innerReq,
                               cancellationToken
                           );
                       }
                       catch (Exception)
                       {
                           // If exceptions are thrown, send back generic 400
                           innerResp = new HttpResponseMessage(
                               HttpStatusCode.BadRequest
                           );
                       }
       
                       // Wrap the response in a message content and put it
                       // into the multipart response
                       outerContent.Add(new HttpMessageContent(innerResp));
                   }
       
                   return outerResp;
               }
           }
      
    2. 配置Web Api config

        var batchHandler = new BatchHandler(config);
       
       config.Routes.MapHttpRoute("batch", "api/batch",
                                  null, null, batchHandler);
       
       config.Routes.MapHttpRoute("default", "api/{controller}/{id}",
                                  new { id = RouteParameter.Optional });
      
    3. 模拟请求

       var client = new HttpClient();
       var batchRequest = new HttpRequestMessage(
           HttpMethod.Post,
           "http://localhost/api/batch"
       );
       
       var batchContent = new MultipartContent("batch");
       batchRequest.Content = batchContent;
       
       batchContent.Add(
           new HttpMessageContent(
               new HttpRequestMessage(
                   HttpMethod.Get,
                   "http://localhost/api/values"
               )
           )
       );
       
       batchContent.Add(
           new HttpMessageContent(
               new HttpRequestMessage(
                   HttpMethod.Get,
                   "http://localhost/foo/bar"
               )
           )
       );
       
       batchContent.Add(
           new HttpMessageContent(
               new HttpRequestMessage(
                   HttpMethod.Get,
                   "http://localhost/api/values/1"
               )
           )
       );
      
       using (Stream stdout = Console.OpenStandardOutput())
       {
           Console.WriteLine("<<< REQUEST >>>");
           Console.WriteLine();
           Console.WriteLine(batchRequest);
           Console.WriteLine();
           batchContent.CopyToAsync(stdout).Wait();
           Console.WriteLine();
       
           var batchResponse = client.SendAsync(batchRequest).Result;
       
           Console.WriteLine("<<< RESPONSE >>>");
           Console.WriteLine();
           Console.WriteLine(batchResponse);
           Console.WriteLine();
           batchResponse.Content.CopyToAsync(stdout).Wait();
           Console.WriteLine();
           Console.WriteLine();
       }
      

    结果如下:

    <<< REQUEST >>>
    Method: POST,
    RequestUri: 'http://localhost/api/batch',
    Version: 1.1,
    Content: System.Net.Http.MultipartContent,
    Headers:
    {
    Content-Type: multipart/batch; boundary="3bc5bd67-3517-4cd0-bcdd-9d23f3850402"
    }
    --3bc5bd67-3517-4cd0-bcdd-9d23f3850402
    Content-Type: application/http; msgtype=request
    GET /api/values HTTP/1.1
    Host: localhost
    --3bc5bd67-3517-4cd0-bcdd-9d23f3850402
    Content-Type: application/http; msgtype=request
    GET /foo/bar HTTP/1.1
    Host: localhost
    --3bc5bd67-3517-4cd0-bcdd-9d23f3850402--
    <<< RESPONSE >>>
    StatusCode: 200,
    ReasonPhrase: 'OK',
    Version: 1.1,
    Content: System.Net.Http.StreamContent,
    Headers:
    {
    Pragma: no-cache
    Cache-Control: no-cache
    Date: Thu, 21 Jun 2012 00:21:40 GMT
    Server: Microsoft-IIS/8.0
    X-AspNet-Version: 4.0.30319
    X-Powered-By: ASP.NET
    Content-Length: 658
    Content-Type: multipart/batch
    Expires: -1
    }
    --3d1ba137-ea6a-40d9-8e34-1b8812394baa
    Content-Type: application/http; msgtype=response
    HTTP/1.1 200 OK
    Content-Type: application/json; charset=utf-8
    ["Hello","world!"]
    --3d1ba137-ea6a-40d9-8e34-1b8812394baa
    Content-Type: application/http; msgtype=response
    HTTP/1.1 404 Not Found
    Content-Type: application/json; charset=utf-8
    {"Message":"No HTTP resource was found that matches the request URI 'http://localhost/foo/bar'."}
    --3d1ba137-ea6a-40d9-8e34-1b8812394baa
    Content-Type: application/http; msgtype=response

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  • 原文地址:https://www.cnblogs.com/goodlucklzq/p/4481481.html
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