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The OPTIONS request type in HTTP is used to probe the server in general or a single servlet about what types of HTTP request types are valid For instance, when you extend the HTTPServlet and implement only the doGet method, you receive the following output from an OPTION request:
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Allow: GET, HEAD, TRACE, OPTIONS
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Unless you plan on adding extra methods that are beyond HTTP/11, you do not need to implement this method
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104 Running Servlets
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To run a servlet, you need either a Web server with servlet support or a servlet engine that will augment an existing server
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A popular choice of Web server for Java developers is the iPlanet Web Server This Web server was originally developed as the Netscape Enterprise Server and the Java Web Server However, Sun and Netscape created an alliance, and the iPlanet Web Server took the best of both these servers It includes built-in support for servlets and other dynamic server-side features Another common choice is the free open-source Apache, which runs on a variety of Unix platforms as well as Windows Apache can be easily modified to support servlets with the Apache JServ add-on If you're using other servlets, products like JRun and ServletExec can add support to existing servers, such as Netscape servers, O'Reilly's Website, and Microsoft's Internet Information Server (IIS) If you're planning on doing a lot of servlet development, it might be wise to evaluate several options
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Apache (http://wwwapacheorg/) Apache JServ (http://javaapacheorg/jserv/) Apache's Jakarta-Tomcat (http://jakartaapacheorg/) JRun (http://wwwallairecom/products/jrun/) ServletExec (http://wwwnewatlantacom/) BEA Weblogic (http://wwwbeasyscom/) Borland Enterprise Application Server (http://wwwinprisecom/bes/appserver/) integrated with JBuilder
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NOTE Originally, the choice for many developers was the standard promoted by Sun, the Java Web Server (http://wwwsuncom/software/jwebserver/indexhtml) However, it has been discontinued, and instead Sun recommends the use of the iPlanet Server (either Enterprise or FastTrack Edition) For more information see http://wwwiplanetcom/products/platform_layer/web_application_2_1dhtml
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Of course, during development, you don't need a high-powered (and possibly expensive) Web server Sun includes a basic Web server with servlet support as part of the free Java Servlet Development Kit (JSDK), which can be downloaded from the Sun Microsystems Web site Downloading this tool will be essential for using the examples throughout this chapter; however, you can use other servlet engines if you wish NOTE Earlier editions of the Java Servlet Development Kit used a tool called servletrunner to start a simple Web server with a servlet engine Later editions use a slightly different method of running the tool, using the startserver and stopserver batch scripts Readers are free to use these, or any other servlet engines that they choose Where the command servletrunner is used, the command startserver can be used interchangeably with later editions
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1041 Downloading the Java Servlet Development Kit
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A servlet engine ships as part of the Java Servlet Development Kit (JSDK), which is available from the Sun Microsystems Web site at http://javasuncom/products/servlet/archivehtml You may use either edition of the JSDK, 20 or 21 both will run equally well with respect to the examples in this chapter You will need to download either to use the examples here
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1042 Installing a Servlet Engine
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The servletrunner application is located in the /bin/directory of your Java Servlet Development Kit installation, whereas the startserver script will be located in the installation's root directory Before running it, however, you will need to install your servlet (in this case, HelloWorld) Step One Verify that your classpath is set correctly and that JSDK is correctly configured If you have difficulty, consult the JSDK instructions (setup may vary slightly across different versions) For example, with the JSDK20 and a Wintel platform, you would add to your autoexecbat file the following statement:
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set classpath=%classpath%;c:\java\jsdk20\lib\jsdkjar
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With the JSDK21 installation and a Wintel platform, you would add to your autoexecbat file this statement:
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