Ruby Cookbook

Recipe 14.1. Grabbing the Contents of a Web Page Problem You want to display or process a specific web page. Solution The simplest solution is to use the open-uri library. It lets you open a web page as though it were a file. This c...

Recipe 14.2. Making an HTTPS Web Request Problem You want to connect to an HTTPS web site, one whose traffic is encrypted using SSL. Solution You need the OpenSSL extension to Ruby. You'll know if it's installed if you can require th...

Recipe 14.3. Customizing HTTP Request Headers Problem When you make an HTTP request, you want to specify custom HTTP headers like " User-Agent" or " Accept-Language". Solution Pass in a Hash of header values to Net::HTTP#get or N...

Recipe 14.4. Performing DNS Queries Problem You want to find the IP address corresponding to a domain name, or see whether a domain provides a certain service (such as an email server). Solution Use the Resolv:: DNS class in the st...

Recipe 14.5. Sending Mail Problem You want to send an email message, either an autogenerated one or one entered in by an end user. Solution First you need to turn the parts of the email message into a single string, representing the ...

Recipe 14.6. Reading Mail with IMAP Credit: John Wells Problem You want to connect to an IMAP server in order to read and manipulate the messages stored there. Solution The net/imap.rb package, written by Shugo Maeda, is part ...

Recipe 14.7. Reading Mail with POP3 Credit: John Wells Problem You want to connect to an POP server in order to read and download the messages stored there. Solution The net/pop.rb package, written by Minero Aoki, is part of Ruby...

Recipe 14.8. Being an FTP Client Problem You want to automatically connect to an FTP server, and upload or download files. Solution Use the Net::FTP class. It provides a filesystem-like interface to an FTP server. In this example,...

Recipe 14.9. Being a Telnet Client Problem You want to connect to a telnet service or use telnet to get low-level access to some other kind of server. Solution Use the Net::Telnet module in the Ruby standard library. The followin...

Recipe 14.10. Being an SSH Client Problem You want to securely send data or commands back and forth between your computer, and another computer on which you have a shell account. Solution Use the Net::SSH module, which implements the S...

Recipe 14.11. Copying a File to Another Machine Problem You want to programatically send files to another computer, the way the Unix scp command does. Solution Use the Net:SSH library to get a secure shell connection to the other ...

Recipe 14.12. Being a BitTorrent Client Problem You want to write a Ruby script that downloads or shares large files with BitTorrent. Solution The third-party RubyTorrent library implements the BitTorrent protocol; you can use it ...

Recipe 14.13. Pinging a Machine Problem You want to check whether a particular machine or domain name can be reached from your computer. Solution Use Ruby's standard ping library. Its single method, Ping.pingecho, TRies to get ...

Recipe 14.14. Writing an Internet Server Problem You want to run a server for a TCP/IP application-level protocol, but no one has written a Ruby server for the protocol yet. This may be because it's a protocol you've made up. Solution...

Recipe 14.15. Parsing URLs Problem You want to parse a string representation of a URL into a data structure that articulates the parts of the URL. Solution URI.parse TRansforms a string describing a URL into a URI object.[5] ...

Recipe 14.16. Writing a CGI Script Credit: Chetan Patil Problem You want to expose Ruby code through an existing web server, without having to do any special configuration. Solution Most web servers are set up to run CGI scripts,...

Recipe 14.17. Setting Cookies and Other HTTP Response Headers Credit: Mauro Cicio Problem You're writing a CGI program and you want to customize the HTTP headers you send in response to a request. For instance, you may want to set...

Recipe 14.18. Handling File Uploads via CGI Credit: Mauro Cicio Problem You want to let a visitor to your web site upload a file to the web server, either for storage or processing. Solution The CGI class provides a simple interface...

Recipe 14.19. Running Servlets with WEBrick Credit: John-Mason Shackelford Problem You want to embed a server in your Ruby application. Your project is not a traditional web application, or else it's too small to justify the use of a...