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Tweaking WCF to build highly scalable async REST API

, 31 Jul 2011
You can build async REST API using WCF but due to some bug in WCF implementation it does not scale as you would want it to. Here's my journey with Microsoft's WCF team to explore the problem and find the right fix.
<%@ WebHandler Language="C#" Class="Echo" %>

using System;
using System.Web;

public class Echo : IHttpHandler {

    static readonly string Output = @"XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
XXXXXXXXXX
";
    public void ProcessRequest (HttpContext context) {
        context.Response.Buffer = false;
        context.Response.BufferOutput = false;
        context.Response.ContentType = "text/plain";
        
        // Simulate high TTFB
        System.Threading.Thread.Sleep(1000);

        for (int i = 0; i < 100; i++)
        {
            context.Response.Write(Output);
            context.Response.Flush();
            System.Threading.Thread.Sleep(10);    
        }
        System.Threading.Thread.Sleep(500);
    }
 
    public bool IsReusable {
        get {
            return true;
        }
    }

}

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Article Copyright 2011 by Omar Al Zabir
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