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Note http://www.rubyinside.com/redirect-test has been set up as a redirect to http:// www.rubyinside.com/test.txt. This helps to demonstrate that the redirect is handled correctly.
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If the response is of the Net::HTTPSuccess class, the content of the response will be returned; if the response is a redirection (represented by a Net::HTTPRedirection object being returned), then get_web_document will be called again, with the URL specified as the target of the redirection by the remote server. If the response is neither a success nor a redirection request, an error of some sort has occurred, and nil will be returned. If you wish, you can check for errors in a more granular way. For example, the error 404 means File Not Found, and is specifically used when trying to request a file that does not exist on the remote web server. When this error occurs, Net::HTTP returns a response of class Net::HTTPNotFound. However, when dealing with error 403, Forbidden, Net::HTTP returns a response of class Net::HTTPForbidden.
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Note A list of HTTP errors and their associated Net::HTTP response classes is available at http://
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www.ruby-doc.org/stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html.
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Basic Authentication As well as basic document retrieval, net/http supports the Basic Authentication scheme used by many web servers to protect their documents in a password-protected area. This demonstration shows how the flexibility of performing the entire request with Net::HTTP.start can come in useful: require 'net/http' url = URI.parse('http://browserspy.dk/password-ok.php') Net::HTTP.start(url.host, url.port) do |http| req = Net::HTTP::Get.new(url.path) req.basic_auth('test', 'test') puts http.request(req).body end
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Note Authentication is ignored on requests for unprotected URLs; but if you were trying to access a URL
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protected by Basic Authentication, basic_auth allows you to specify your credentials.
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C h a p t e r 1 4 r U B Y a N D t h e I N t e r N e t
Posting Form Data In our examples so far, we have only been retrieving data from the Web. Another form of interaction is to send data to a web server. The most common example of this is when you fill out a form on a web page. You can perform the same action from Ruby. For example: require 'net/http' url = URI.parse('http://www.rubyinside.com/test.cgi') response = Net::HTTP.post_form(url,{'name' => 'David', 'age' => '24'}) puts response.body
You say David is 24 years old. In this example, you use Net::HTTP.post_form to perform a POST HTTP request to the specified URL with the data in the hash parameter to be used as the form data.
Note
test.cgi is a special program that returns a string containing the values provided by the name and age form fields, resulting in the preceding output. We looked at how to create CGI scripts in 10.
As with the basic document retrieval examples, there s a more complex, lower-level way to achieve the same thing by taking control of each step of the form submission process: require 'net/http' url = URI.parse('http://www.rubyinside.com/test.cgi') Net::HTTP.start(url.host, url.port) do |http| req = Net::HTTP::Post.new(url.path) req.set_form_data({ 'name' => 'David', 'age' => '24' }) puts http.request(req).body end This technique allows you to use the basic_auth method if needed, too. Using HTTP Proxies Proxying is when HTTP requests do not go directly between the client and the HTTP server, but through a third party en route. In some situations, it might be necessary to use an HTTP proxy for your HTTP requests. This is a common scenario in schools and offices where web access is regulated or filtered.
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net/http supports proxying by creating an HTTP proxy class upon which you can then use and perform the regular HTTP methods. To create the proxy class, use Net::HTTP::Proxy. For example: web_proxy = Net::HTTP::Proxy('your.proxy.hostname.or.ip', 8080) This call to Net::HTTP::Proxy generates an HTTP proxy class that uses a proxy with a particular hostname on port 8080. You would use such a proxy in this fashion: require 'net/http' web_proxy = Net::HTTP::Proxy('your.proxy.hostname.or.ip', 8080) url = URI.parse('http://www.rubyinside.com/test.txt') web_proxy.start(url.host, url.port) do |http| req = Net::HTTP::Get.new(url.path) puts http.request(req).body end In this example, web_proxy replaces the reference to Net::HTTP when using the start method. You can use it with the simple get_response technique you used earlier, too: require 'net/http' web_proxy = Net::HTTP::Proxy('your.proxy.hostname.or.ip', 8080) url = URI.parse('http://www.rubyinside.com/test.txt') response = web_proxy.get_response(url) puts response.body These examples demonstrate that if your programs are likely to need proxy support for HTTP requests, it might be worth generating a proxy-like system even if a proxy isn t required in every case. For example: require 'net/http' http_class = ARGV.first Net::HTTP::Proxy(ARGV[0], ARGV[1]) : Net::HTTP url = URI.parse('http://www.rubyinside.com/test.txt') response = http_class.get_response(url) puts response.body If this program is run and an HTTP proxy hostname and port are supplied on the command line as arguments for the program, an HTTP proxy class will be assigned to http_class. If no proxy is specified, http_class will simply reference Net::HTTP. This allows http_class to be used in place of Net::HTTP when requests are made, so that both proxy and nonproxy situations work and are coded in exactly the same way.
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