2014年7月17日

[Azure][WebSites] 在WebSite上使用HttpModule取得Response Length

其實絕大多數一般的網站都可以直接搬上Azure Website,不過最近剛好有客戶需要,因此還是寫起來。

  • 首先我們需要一個HttpModule以及一個Custom Response Filter
  • 建立一個HttpModule,在Init()中加入以下程式碼
    context.PostRequestHandlerExecute += delegate(object sender, EventArgs e)
    {
    HttpContext httpContext = ((HttpApplication)sender).Context;
    HttpResponse response = httpContext.Response;
    response.Filter = new IWantMyResponseLengthStream(response.Filter);
    }




  • 接著我們需要撰寫一個IWantMyResponseLengthStream類別,繼承自MemoryStream


        public class IWantMyResponseLengthStream: MemoryStream
    {
    private readonly Stream responseStream;
    private long responseLen = 0;
    public override long Length
    {
    get
    {
    return responseLen ;
    }
    }
    public IWantMyResponseLengthStream(Stream responseStream)
    {
    this.responseStream = responseStream;
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
    this.responseLen += count;
    this.responseStream.Write(buffer, offset, count);
    }

    public override void Flush()
    {
    //this.Length就是回應的訊息大小了
    //var requestURL = HttpContext.Current.Request.Url.ToString();
    //var remoteIP = HttpContext.Current.Request.UserHostAddress;
    base.Flush();
    }
    }




  • 接著確認我們的Azure Website服務的pipeline模式是Classic還是Integrated;在WebSite->Configure->Managed Pipeline Mode

    image



  • 根據不同的Pipeline Mode,修改web.config

    image



  • 然後佈署到Azure WebSite上就可以了。


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