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Overview of HTTP Handlers HTTP handlers are custom classes you create in any NET language to process speci c types of HTTP requests These handlers provide a low level of interaction, much like ISAPI extensions but with a simpler programming model To create a handler, you need to create a class that implements the IHttpHandler interface and provide implementation for the IsReusable property and ProcessRequest method The IsReusable property is called by the ASPNET 20 runtime to determine whether this instance of the HTTP handler can be reused for processing another request of the same type The property returns either true if it can be reused or false if not The ProcessRequest method is the workhorse of the handler and is responsible for processing the request The method takes one parameter of type HttpContext that encapsulates all the HTTP-speci c information about the request, providing access to everything from the Application object to the Request and Response objects With access to this kind of information, it s not hard to see how powerful handlers are In Listing C1, we show a simple HTTP handler designed to write back Hello World to the output stream In the ProcessRequest method, you can see that we are setting the content type to text/plain, which sets the Content-Type HTTP header of the response, and then writing Hello World to the response buffer The IsReusable property in our case is returning false, which means that it can t be shared across all requests of its type The next topic we cover is how we set the types of requests a handler can process

TextTestResult(

TestListener runner) {

Note that all these messages do not contain the traditional wrapper elements created by NET For example, a straightforward GetTemperature implementation would result in the following request and response messages: <!-- traditional GetTemperature request message --> <GetTemperature xmlns="http://wwwlearnxmlwscom/WeatherService"> <TemperatureRequest>string</TemperatureRequest> </GetTemperature>

namespace SimpleHandler { public class MyHandler : IHttpHandler { #region IHttpHandler Members public bool IsReusable { get { return false; } } public void ProcessRequest(HttpContext context)

fRunner= runner; }

{ contextResponseContentType = "text/plain"; contextResponseWrite("Hello World"); } #endregion } }

<!-- traditional GetTemperature response message --> <GetTemperatureResponse xmlns="http://wwwlearnxmlwscom/WeatherService "> <Temperature>float</Temperature> </GetTemperatureResponse>

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I compile and test to confirm that these changes work 4 Now I apply Pull Up Method [F] on every notification method inTextTestResult and UITestResult This step is tricky because the methods I'll be pulling up already exist on TestResult, the superclass of TextTestResult and UITestResult To do this correctly, I need to merge code from the TestResult subclasses into TestResult This yields the following changes:

The types of requests a handler can process are determined when you register the handler in the webcon g le of your application Handlers can be registered to respond to speci c HTTP verbs such as POST and GET and a speci c path that can be represented by a speci c URL or by using wildcard strings such as *axd In Listing C2, we show a handler being added to the HttpHandlers section of the webcon g le with a verb of *, which means all, a path of Handleraxd, and nally a type of SimpleHandler MyHandler, which is the name of the class including the namespace With this registration in place, the handler is set up to handle all types of requests that contain a path of MyHandleraxd

Clearly this is not what we want Not only does it add unnecessary wrapper elements, it also creates the impression that this Web service is based on RPC-style design when in fact I started by designing the messages not the RPC interface Let s take a look at how you can implement a NET Web service that

This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks

<systemweb> <httpHandlers> <add verb="*" path="MyHandleraxd" type="SimpleHandlerMyHandler"/> </httpHandlers> </systemweb>

protected TestListener fRunner;

receives and emits the messages described in listing 13-1

public TestResult(TestListener runner) { this(); fRunner= runner; }

In Listing C2, the path is MyHandleraxd, but in the Web project, that le does not exist The path used does not have to physically exist for the handler to respond to it This is how ASPNET AJAX processes all the ASPNET 20 application services because the URL references don t physically exist

There are two options for implementing the messages we designed First, you could create a WSDL document using the messages schemas from listing 13-1 then run wsdlexe server on this WSDL to generate a Web service stub implementation If you do this, you are essentially defining the interface first (the WSDL), then implementing it which is exactly what I explained in chapter 8 Alternatively, you can code the Web service directly and use a combination of attributes on the service itself as well as on each Web method to ensure the emitted WSDL adheres to the message specification in listing 13-1 8 already covered the interface-based approach so I will take the second approach here But if you are comfortable enough with WSDL, I recommend you try the first approach at least once for this Web service just to get a feel for it Generating Classes from Complex Types First thing we ll do is generate classes that correspond to complex types in service messages In this example, only the CurrentWeather element has a complex type To generate a class that corresponds to this type, you run xsdexe with the /classes option Since you want to generate a class for one of the elements in the schema (rather than classes for all elements in the schema), you specify the element name and namespace with the /e and /u options respectively

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