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be 150 pixels in width, and the second should take up the remainder of the application. To be able to see what is going on in the grid, set ShowGridLines to True. Also add two TextBlock controls to the application: one in the first column and one in the second column. Your source should appear as follows:

Basic Authentication As well as basic document retrieval, net/http supports the Basic Authentication scheme used by many web servers to protect their documents in a password-protected area. This demonstration shows how the flexibility of performing the entire request with Net::HTTP.start can come in useful: require 'net/http' url = URI.parse('http://browserspy.dk/password-ok.php') Net::HTTP.start(url.host, url.port) do |http| req = Net::HTTP::Get.new(url.path) req.basic_auth('test', 'test') puts http.request(req).body end

Note Authentication is ignored on requests for unprotected URLs; but if you were trying to access a URL

You should now have the DSL file (SandwichLanguage.dsl), and the DSL Grammar definition file (LunchCounter.mg) in your new working folder (C:\LunchCounter). But you can t yet deploy this code. The problem is with the generated M Graph tree, displayed in the right pane of Intellipad. This is not yet in a form that can be used by the command-line tools to build the SQL Server tables. Since this is an introductory level book, I will avoid going through all of the diagnostics necessary to arrive at a version of the DSL Grammar code that allows you to deploy the model, with instances, to the database. (Pay no attention to the man behind the curtain.) The primary fix is to reset the Stuff, Bread, and Condiment types to named entities rather than text types. The Bread component will be set as a collection, even though it will always be a collection of one for a particular instance of SandwichOrder. This will also require three new syntax definitions for the new entity types: BreadEntity, CondimentEntity, and StuffEntity. These changes appear in the gray portion of Figure 3-31, and the right pane shows the new M Graph.

Posting Form Data In our examples so far, we have only been retrieving data from the Web. Another form of interaction is to send data to a web server. The most common example of this is when you fill out a form on a web page. You can perform the same action from Ruby. For example: require 'net/http' url = URI.parse('http://www.rubyinside.com/test.cgi') response = Net::HTTP.post_form(url,{'name' => 'David', 'age' => '24'}) puts response.body

<UserControl x:Class="Ch4_GridSplitter.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White" ShowGridLines="True"> <Grid.ColumnDefinitions> <ColumnDefinition Width="150" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <TextBlock Text="Apress, Inc." /> <TextBlock Grid.Column="1" Text="Beginning Silverlight 2 by Robert Lair" /> </Grid> </UserControl>

You say David is 24 years old. In this example, you use Net::HTTP.post_form to perform a POST HTTP request to the specified URL with the data in the hash parameter to be used as the form data.

test.cgi is a special program that returns a string containing the values provided by the name and age form fields, resulting in the preceding output. We looked at how to create CGI scripts in 10.

As with the basic document retrieval examples, there s a more complex, lower-level way to achieve the same thing by taking control of each step of the form submission process: require 'net/http' url = URI.parse('http://www.rubyinside.com/test.cgi') Net::HTTP.start(url.host, url.port) do |http| req = Net::HTTP::Post.new(url.path) req.set_form_data({ 'name' => 'David', 'age' => '24' }) puts http.request(req).body end This technique allows you to use the basic_auth method if needed, too. Using HTTP Proxies Proxying is when HTTP requests do not go directly between the client and the HTTP server, but through a third party en route. In some situations, it might be necessary to use an HTTP proxy for your HTTP requests. This is a common scenario in schools and offices where web access is regulated or filtered.

At this point, your Silverlight application should look like Figure 4-15.