Extended maintenance of Ruby 1.9.3 ended on February 23, 2015. Read more

In Files

  • open-uri.rb


OpenURI is an easy-to-use wrapper for net/http, net/https and net/ftp.


It is possible to open an http, https or ftp URL as though it were a file:

  open("http://www.ruby-lang.org/") {|f|
    f.each_line {|line| p line}

The opened file has several getter methods for its meta-information, as
follows, since it is extended by OpenURI::Meta.

  open("http://www.ruby-lang.org/en") {|f|
    f.each_line {|line| p line}
    p f.base_uri         # <URI::HTTP:0x40e6ef2 URL:http://www.ruby-lang.org/en/>
    p f.content_type     # "text/html"
    p f.charset          # "iso-8859-1"
    p f.content_encoding # []
    p f.last_modified    # Thu Dec 05 02:45:02 UTC 2002

Additional header fields can be specified by an optional hash argument.

    "User-Agent" => "Ruby/#{RUBY_VERSION}",
    "From" => "foo@bar.invalid",
    "Referer" => "http://www.ruby-lang.org/") {|f|
    # ...

The environment variables such as http_proxy, https_proxy and ftp_proxy
are in effect by default.  :proxy => nil disables proxy.

  open("http://www.ruby-lang.org/en/", :proxy => nil) {|f|
    # ...

URI objects can be opened in a similar way.

  uri = URI.parse("http://www.ruby-lang.org/en/")
  uri.open {|f|
    # ...

URI objects can be read directly. The returned string is also extended by

  str = uri.read
  p str.base_uri

Author:: Tanaka Akira <akr@m17n.org>