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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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Figure 9-4. The page for testing the GetAttendees() web method
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How It Works If you look at the URL after clicking the Invoke button, you can see the actual URL of the web method you called: http://localhost/FriendsReunion/Services/Partners.asmx/GetAttendees Notice that the URL is built by appending the method name after the URL to the .asmx file. These web pages provide us, as developers, with a great means of viewing and testing web services, but the textual descriptions, text boxes, and so on are not of the structured nature used by other applications when interfacing with web services. If you select the Service Description link from the Partners.asmx page (Figure 9-3), you are taken to a page with the query string parameter of WSDL. This parameter can be added to any .asmx URL, and it provides the Web Service Description Language (WSDL) definition of the service.
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CHAPTER 9 WEB SERVICES IN WEB APPLICATIONS
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This WSDL definition is an XML document that specifies all of the methods and data types that compose the web service. It is used by other systems to retrieve all of the information necessary to call a service. If you view this document, you ll see that it defines the parameters that are expected when the GetAttendees() method is called and the response that this returns. It then goes on to detail the way that the method can be called, which is, by default, only SOAP . For testing and debugging purposes, the HTTP-POST verb is allowed only on the local machine (localhost), but is not reflected on the WSDL, as it s not accessible from the outside world. You could also enable HTTP-GET and HTTP-POST without restrictions, simply by adding the following entry in your Web.config file: <system.web> ...etc... <webServices> <protocols> <add name="HttpPost"/> <add name="HttpGet"/> </protocols>
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</webServices>
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Both HTTP-GET and HTTP-POST are disabled by default through the Machine.config file. Enabling HTTP-POST may be a good idea if you have clients or programming languages that don t have built-in support for SOAP such as JavaScript from inside a web page. In that case, , composing an HTTP request using the POST verb is far easier than writing SOAP (which can be in a fairly complex XML format). HTTP-GET may be useful for services that don t require authentication and are intended to only retrieve information from the web service, as in this example: http://localhost/FriendsReunion/Services/Partners.asmx/GetAttendees placeId= 11CF70F8-E48E-4bdc-AE1A-5F2277015851 We ll look at SOAP in more detail later in this chapter.
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The web method that you created in the previous section returns an integer. As we mentioned, applications making use of the functionality that you expose determine this by examining the WSDL definition of your services. While returning simple data such as strings and integers will work fine this way, what happens when you want to return something more complicated, such as an object containing all of the requests for contact for a person When retrieving this information from the database, and passing it around internally using normal methods, you could use a DataSet. This same approach works with a web method, and that s how we ll handle the other functionality we re adding to the Friends Reunion database, which is the retrieval of contact requests for a given user of the system. To implement this functionality, you ll need to create a new method within the service that takes in a user name and password and returns a DataSet. The information returned will include complete information about all the users who requested to contact the individual performing the query, based on the user s login data. In our simple implementation, entering the wrong user name or password will simply cause no results to be returned, instead of a failure.
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