buglessdr · September 1, 2017 06:29 · Jun 3, 2012
diff --git a/web-server.rb b/web-server.rb
@@ -0,0 +1,65 @@
+#!/usr/bin/env ruby
+
+require "webrick"
+
+=begin
+    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.
+    
+    The following 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).
+
+    This example lets you call the URL's: "add" and "subtract" and pass through arguments to them
+
+    Example usage: 
+        http://localhost:1234/ (this will show the specified error message)
+        http://localhost:1234/add?a=10&b=10 
+        http://localhost:1234/subtract?a=10&b=9
+=end
+
+class MyNormalClass
+    def self.add (a, b)
+        a.to_i + b.to_i
+    end
+
+    def self.subtract (a, b)
+        a.to_i - b.to_i
+    end
+end
+
+class MyServlet < WEBrick::HTTPServlet::AbstractServlet
+    def do_GET (request, response)
+        if request.query["a"] && request.query["b"]
+            a = request.query["a"]
+            b = request.query["b"]
+            response.status = 200
+            response.content_type = "text/plain"
+            result = nil
+
+            case request.path
+                when "/add"
+                    result = MyNormalClass.add(a, b)
+                when "/subtract"
+                    result = MyNormalClass.subtract(a, b)
+                else
+                    result = "No such method"
+            end
+
+            response.body = result.to_s + "\n"
+        else
+            response.status = 200
+            response.body = "You did not provide the correct parameters"
+        end
+    end
+end
+
+server = WEBrick::HTTPServer.new(:Port => 1234)
+
+server.mount "/", MyServlet
+
+trap("INT") {
+    server.shutdown
+}
+
+server.start