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In 17, the cgi library is covered in more depth, along with information about using HTTP cookies and sessions, so if this mode of deployment is of interest to you, please refer there for extended information and longer examples. In general, however, CGI execution is becoming unpopular due to its lack of speed and the need for a Ruby interpreter to be executed on every request. This makes CGI unsuitable for high-use or heavy-load situations.
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Depending on your setup (or hosting environment), you might find that Sinatra offers a nicer way to Tip
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do what we ve looked at in this section. See the Sinatra section in 13.
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HTTP is the communications protocol of the World Wide Web. Even though it s commonly used to shuttle web pages from one place to another, it can also be used on an internal network or even to communicate between services on a single machine. Creating an HTTP server from your Ruby program can provide a way for users (or even other programs) to make requests to your Ruby program, meaning you don t need to distribute the source code, but can instead make your program s functionality available over a network (such as the Internet). In this section, we re going to look directly at creating basic HTTP servers using two libraries, WEBrick and Mongrel, directly. It is useful to have experience building servers directly so that you can see how things work at a low level, even though, ultimately, you will probably choose to use a web app framework (as covered in 13) to make life easier.
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Note In this section, we re creating scripts that are HTTP servers themselves and do not rely on
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WEBrick is a Ruby library that makes it easy to build an HTTP server with Ruby. It comes with most installations of Ruby by default (it s part of the standard library), so you can usually create a basic web/HTTP server with only several lines of code: require 'webrick' server = WEBrick::GenericServer.new( :Port => 1234 ) trap("INT"){ server.shutdown } server.start do |socket| socket.puts Time.now end
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This code creates a generic WEBrick server on the local machine on port 1234, shuts the server down if the process is interrupted (often done with Ctrl+C), and for each new connection prints the current date and time. If you run this code, you could try to view the results in your web browser by visiting http://127.0.0.1:1234/ or http://localhost:1234/.
Caution Because your test program doesn t output valid HTTP, it might fail with some particularly sensitive web browsers. However, if you understand how to use the telnet program, you can use telnet 127.0.0.1 1234 to see the result. Otherwise, continue to the next example, where valid HTTP is returned for web browsers to view.
However, a more powerful technique is when you create servlets that exist in their own class and have more control over the requests and responses made to them: require 'webrick' class MyServlet < WEBrick::HTTPServlet::AbstractServlet def do_GET(request, response) response.status = 200 response.content_type = "text/plain" response.body = "Hello, world!" end end server = WEBrick::HTTPServer.new( :Port => 1234 ) server.mount "/", MyServlet trap("INT"){ server.shutdown } server.start This code is more elaborate, but you now have access to request and response objects that represent both the incoming request and the outgoing response. For example, you can now find out what URL the user tried to access in his or her browser with such a line: response.body = "You are trying to load #{request.path}" request.path contains the path within the URL (for example, /abcd from http:// 127.0.0.1:1234/abcd), meaning you can interpret what the user was trying to request, call a different method, and provide the correct output. Here s a more elaborate example: require 'webrick' class MyNormalClass def MyNormalClass.add(a, b) a.to_i + b.to_i end
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