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As an example, consider the following code, where a user has requested product information and you are intending to provide that information via a request to a server where it is stored: < php // configure if ( !empty( $_POST['productid'] ) ) { // for demonstration purposes, sanitizing is omitted here $productid = $_POST['productid']; $serviceHost = "products.example.com" $serviceURI = "/lookup.php id=$productid"; // build $request $request $request the HTTP request = "HTTP/1.0 GET $serviceURI\r\n"; .= "Host: $serviceHost\r\n .= "Connection: Close\r\n\r\n";

As you can see, includes.jsp displays the letter B in all cases except when you implement the outer inclusion with the include directive and the inner inclusion with the jsp:include action. This means that only with that particular combination of file inclusions, includes.jsp accesses the c.txt file that is in the same directory. In the other three cases, includes.jsp accesses the c.txt file that is in the d directory together with b_act.jsp and b_dir.jsp. To understand these results, you have to know that when Tomcat translates a JSP page into a Java class, it replaces <jsp:include page="fname"/> with an execution of the method org.apache.jasper.runtime.JspRuntimeLibrary.include(request, response, "fname", out, false), while <%@include file="fname"%> results in the copying of the content of the fname file. Therefore, in the third case of the example, the <jsp:include page="c.txt"/> inside b_act.jsp is replaced with an include(request, response, "c.txt", out, false), and then the whole b_act.jsp is copied into includes.jsp. That s why the servlet picks up the file in the directory of includes.jsp. The fact that b_act.jsp was in a different directory was lost when its include directive was replaced by the file content. We decided to spend so much effort on this issue because the inclusion mechanism is often misunderstood and causes many people to knock their heads against the wall when files seem to disappear.

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Suppose that you d like to have a link on the Products page to display hot deals, as shown in Figure 6 9.

// make a network connection $fp = fsockopen( $serviceHost, 80 ); // set it to blocking mode stream_set_blocking( $fp, 1 ); // send the request fwrite( $fp, $request ); // get response $response = stream_get_contents( $fp ); } > In this demonstration script, you first retrieve the user s specification of which product he wants information for, and store it in the $productid variable. You use that variable to construct an HTTP GET request, appending its value to the name of the requested script so that it may be retrieved by the remote server as a $_GET variable. The rest of the script makes the connection, sets that connection to blocking mode so that it waits for the data to become available on the other end (see http://php.net/stream_set_blocking for more information), and finally retrieves that data for display to the end user. Because the value of $productid is not sanitized in any way, an attacker could inject extra headers or even an entire entity body into the HTTP request. The vulnerability could be completely prevented by casting the submitted product ID to an integer, like this: $productid = (int) $_POST['productid'];

To tell a browser how to run an applet by means of the Java plug-in, you need to utilize an <object> or <embed> HTML construct (which one depends on the browser). This ensures that the browser downloads the plug-in if necessary or notifies the user if that is not possible. The plugin action lets you generate the appropriate browser-dependent construct. Unfortunately, at the moment of writing, this works with Internet Explorer and Opera but not with Firefox. See Listing D-20 for an example. Listing D-20. applet.jsp <%@page language="java" contentType="text/html"%> <html><head><title>Applet</title></head><body> <jsp:plugin type="applet" code="MyApplet.class" codebase="/tests" height="100" width="100"> <jsp:params> <jsp:param name="line" value="Well said!"/> </jsp:params> <jsp:fallback>Unable to start plugin</jsp:fallback> </jsp:plugin> </body></html>

Why is this requirement interesting Consider where you should put the navigation case. If you put it into the global navigation rule, it would affect all the pages in the applica tion, which is not what you want. To see how to do it, read on. First, modify products.xhtml as shown in Listing 6 6. Listing 6 6. Putting a JSF Tag in a Concrete Part

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