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1 . When you are writing an HTTP handler, which method of the IHttpHandler interface should you implement to produce a response for a specific HTTP request
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2. You are running IIS 7.0 in integrated mode. You want to register an HTTP handler
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or module by using the Web.config file. To which configuration element do you add your handler or module
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HTTP module by using the IHttpModule interface
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1 . You should implement the ProcessRequest method. This method will be called
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2. You add the configuration information to the <system.WebServer> element
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when using IIS 7.0 in integrated mode.
3. You would implement the IHttpAsyncHandler interface, which would include the
BeginProcessRequest and EndProcessRequest methods.
4. You would implement the IHttpModule.Init method and use it to register your
code to application events.
570 ChAPTER 10
Writing and Working with HTTP Modules and Web Services
Pr ActIcE
Creating a Custom hTTP handler
In this practice, you create a custom HTTP handler to dynamically return images based on a request for files of type JPG.
oN the CoMpaNIoN MedIa
If you encounter a problem completing an exercise, you can find the completed projects in the samples installed from this book s companion CD. For more information about the project files and other content on the CD, see Using the Companion Media in this book s Introduction.
E xErcIsE Creating a Custom Image Handler
In this exercise, you create an ASP.NET website and a custom HTTP handler to return images based on user requests.
1. 2. 3. 4.
Open Visual Studio and create a new website called jpeghandler. Right-click your website in Solution Explorer and choose Add ASP.NET Folder and then App_Code. Add a new class file to the App_Code directory. Name the class jpeghandler. Edit the automatically generated class declaration so that it implements the IHttpHandler interface, as the following shows.
Sample of Visual Basic Code 'Public Class JpegHandler Implements IHttpHandler End Class Sample of C# Code public class JpegHandler : IHttpHandler
Use Visual Studio to automatically generate the required IHttpHandler members IsReusable and ProcessRequest. You can do so by pointing to the IHttpHandler interface declaration and using the smart tag. Implement the IsReusable property by returning false.
Sample of Visual Basic Code Public ReadOnly Property IsReusable As Boolean _ Implements System.Web.IHttpHandler.IsReusable Get Return False End Get End Property
Lesson 1: Creating HTTP Handlers and HTTP Modules
ChAPTER 10
Sample of C# Code public bool IsReusable { get { return false; } }
Add a folder called Images to your website. From the sample images folder on your machine, add the Koala.jpg and Jellyfish.jpg images. Alternatively, you can copy them from the CD for this book. Implement the ProcessRequest method. Inside this method, check the requested URL. If one of the images is requested, transmit the file as part of the response. You could use this simple example to reroute user requests for images to other locations, to a database, or to dynamically generated images. The following code shows an example.
Sample of Visual Basic Code Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) _ Implements System.Web.IHttpHandler.ProcessRequest 'set the MIME type context.Response.ContentType = "image/jpeg" Dim Request As HttpRequest = context.Request Dim Response As HttpResponse = context.Response If Request.RawUrl.ToLower.Contains("jellyfish.jpg") Then Response.TransmitFile(Request.PhysicalApplicationPath & _ "/Images/Jellyfish.jpg") ElseIf Request.RawUrl.ToLower.Contains("koala.jpg") Then Response.TransmitFile(Request.PhysicalApplicationPath & _ "/Images/Koala.jpg") Else Response.Write("File not found") End If End Sub Sample of C# Code public void ProcessRequest(HttpContext context) { //set the MIME type context.Response.ContentType = "image/jpeg"; HttpRequest Request = context.Request; HttpResponse Response = context.Response; if(Request.RawUrl.ToLower().Contains("jellyfish.jpg")) { Response.TransmitFile(Request.PhysicalApplicationPath + "/Images/Jellyfish.jpg"); }
572 ChAPTER 10
Writing and Working with HTTP Modules and Web Services
else if (Request.RawUrl.ToLower().Contains("koala.jpg")) { Response.TransmitFile(Request.PhysicalApplicationPath + "/Images/Koala.jpg"); } else { Response.Write("File not found"); } }
Note
DEFining ThE mimE TyPE
This code sample sets the context.Response.ContentType property to "image/jpeg". You should use this property to define the correct Multipurpose Internet Mail Extensions (MIME) type so that the browser knows how to handle the file you send it. Otherwise, the browser might try to display it as text.
Open the Web.config file. Add an <httpHandler> element to the <system.Web> element. The following markup demonstrates this.
<httpHandlers> <add verb="*" path="*.jpg" type="JpegHandler"/> </httpHandlers>
Run your application. Edit the URL in the browser to point to either Koala.jpg or Jellyfish.jpg and notice the results. Try another file name and notice that your JpegHandler indicates that the file is not found.
Lesson Summary
By default, ASP.NET handles a limited number of file types, including ASPX, ASCX, and AXD. You can configure ASP.NET to handle any file type, which is useful if you need to dynamically generate normally static files, such as images. To configure ASP.NET to receive requests for other types, you create a custom HttpHandler class and add the type to the Web.config file in the <httpHandlers> section. You can use the .ashx file extension to create a basic, page-based HTTP handler. You can create asynchronous HTTP handlers by implementing the IHttpAsyncHandler. Typically these handlers are meant to perform multiple actions simultaneously to help improve application performance. Asynchronous webpages can improve performance in scenarios in which the thread pool might be limiting performance. To enable asynchronous pages, first add the Async="true" attribute to the @ Page directive. Then create events to start and end your asynchronous code. You can create a custom HTTP module to respond to application events for every request made to your website. You do so by implementing the IHttpModule interface and registering your events inside its Init method.
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