module OpenURI::OpenRead - Documentation for Ruby 4.0
Description: module OpenURI::OpenRead: Mixin for HTTP and FTP URIs.
Keywords: ruby,module,OpenURI::OpenRead

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# module OpenURI::OpenRead

Mixin for HTTP and FTP URIs.

### Public Instance Methods

open (*rest, &block)
Source

    # File lib/open-uri.rb, line 810
    def open(*rest, &block)
      OpenURI.open_uri(self, *rest, &block)
    end

`OpenURI::OpenRead#open` provides ‘open’ for `URI::HTTP` and `URI::FTP`.

`OpenURI::OpenRead#open` takes optional 3 arguments as:

    OpenURI::OpenRead#open([mode [, perm]] [, options]) [{|io| ... }]

`OpenURI::OpenRead#open` returns an IO-like object if block is not given. Otherwise it yields the `IO` object and return the value of the block. The `IO` object is extended with `OpenURI::Meta`.

`mode` and `perm` are the same as `Kernel#open`.

However, `mode` must be read mode because `OpenURI::OpenRead#open` doesn’t support write mode (yet). Also `perm` is ignored because it is meaningful only for file creation.

`options` must be a hash.

Each option with a string key specifies an extra header field for HTTP. I.e., it is ignored for FTP without HTTP proxy.

The hash may include other options, where keys are symbols:

:proxy

  Synopsis:

      :proxy => "http://proxy.foo.com:8000/"
      :proxy => URI.parse("http://proxy.foo.com:8000/")
      :proxy => true
      :proxy => false
      :proxy => nil

  If :proxy option is specified, the value should be `String`, `URI`, boolean or nil.

  When `String` or `URI` is given, it is treated as proxy `URI`.

  When true is given or the option itself is not specified, environment variable ‘scheme_proxy’ is examined. ‘scheme’ is replaced by ‘http’, ‘https’ or ‘ftp’.

  When false or nil is given, the environment variables are ignored and connection will be made to a server directly.

:proxy_http_basic_authentication

  Synopsis:

      :proxy_http_basic_authentication =>
        ["http://proxy.foo.com:8000/", "proxy-user", "proxy-password"]
      :proxy_http_basic_authentication =>
        [URI.parse("http://proxy.foo.com:8000/"),
         "proxy-user", "proxy-password"]

  If :proxy option is specified, the value should be an `Array` with 3 elements. It should contain a proxy `URI`, a proxy user name and a proxy password. The proxy `URI` should be a `String`, an `URI` or nil. The proxy user name and password should be a `String`.

  If nil is given for the proxy `URI`, this option is just ignored.

  If :proxy and :proxy_http_basic_authentication is specified, `ArgumentError` is raised.

:http_basic_authentication

  Synopsis:

      :http_basic_authentication=>[user, password]

  If :http_basic_authentication is specified, the value should be an array which contains 2 strings: username and password. It is used for HTTP Basic authentication defined by RFC 2617.

:content_length_proc

  Synopsis:

      :content_length_proc => lambda {|content_length| ... }

  If :content_length_proc option is specified, the option value procedure is called before actual transfer is started. It takes one argument, which is expected content length in bytes.

  If two or more transfers are performed by HTTP redirection, the procedure is called only once for the last transfer.

  When expected content length is unknown, the procedure is called with nil. This happens when the HTTP response has no Content-Length header.

:progress_proc

  Synopsis:

      :progress_proc => lambda {|size| ...}

  If :progress_proc option is specified, the proc is called with one argument each time when ‘open’ gets content fragment from network. The argument `size` is the accumulated transferred size in bytes.

  If two or more transfer is done by HTTP redirection, the procedure is called only one for a last transfer.

  :progress_proc and :content_length_proc are intended to be used for progress bar. For example, it can be implemented as follows using Ruby/ProgressBar.

      pbar = nil
      open("http://...",
        :content_length_proc => lambda {|t|
          if t && 0 < t
            pbar = ProgressBar.new("...", t)
            pbar.file_transfer_mode
          end
        },
        :progress_proc => lambda {|s|
          pbar.set s if pbar
        }) {|f| ... }

:read_timeout

  Synopsis:

      :read_timeout=>nil     (no timeout)
      :read_timeout=>10      (10 second)

  :read_timeout option specifies a timeout of read for http connections.

:open_timeout

  Synopsis:

      :open_timeout=>nil     (no timeout)
      :open_timeout=>10      (10 second)

  :open_timeout option specifies a timeout of open for http connections.

:ssl_ca_cert

  Synopsis:

      :ssl_ca_cert=>filename or an Array of filenames

  :ssl_ca_cert is used to specify CA certificate for SSL. If it is given, default certificates are not used.

:ssl_verify_mode

  Synopsis:

      :ssl_verify_mode=>mode

  :ssl_verify_mode is used to specify openssl verify mode.

:ssl_min_version

  Synopsis:

      :ssl_min_version=>:TLS1_2

  :ssl_min_version option specifies the minimum allowed SSL/TLS protocol version. See also `OpenSSL::SSL::SSLContext#min_version=`.

:ssl_max_version

  Synopsis:

      :ssl_max_version=>:TLS1_2

  :ssl_max_version option specifies the maximum allowed SSL/TLS protocol version. See also `OpenSSL::SSL::SSLContext#max_version=`.

:ftp_active_mode

  Synopsis:

      :ftp_active_mode=>bool

  `:ftp_active_mode => true` is used to make ftp active mode. Ruby 1.9 uses passive mode by default. Note that the active mode is default in Ruby 1.8 or prior.

:redirect

  Synopsis:

      :redirect=>bool

  `:redirect` is true by default. `:redirect => false` is used to disable all HTTP redirects.

  `OpenURI::HTTPRedirect` exception raised on redirection. Using `true` also means that redirections between http and ftp are permitted.

:max_redirects

  Synopsis:

      :max_redirects=>int

  Number of HTTP redirects allowed before `OpenURI::TooManyRedirects` is raised. The default is 64.

:request_specific_fields

  Synopsis:

      :request_specific_fields => {}
      :request_specific_fields => lambda {|url| ...}

  :request_specific_fields option allows specifying custom header fields that are sent with the HTTP request. It can be passed as a `Hash` or a `Proc` that gets evaluated on each request and returns a `Hash` of header fields.

  If a `Hash` is provided, it specifies the headers only for the initial request and these headers will not be sent on redirects.

  If a `Proc` is provided, it will be executed for each request including redirects, allowing dynamic header customization based on the request URL. It is important that the `Proc` returns a `Hash`. And this `Hash` specifies the headers to be sent with the request.

  For Example with `Hash`

      URI.open("http://...",
               request_specific_fields: {"Authorization" => "token dummy"}) {|f| ... }

  For Example with Proc:

      URI.open("http://...",
               request_specific_fields: lambda { |uri|
                 if uri.host == "example.com"
                   {"Authorization" => "token dummy"}
                 else
                   {}
                 end
               }) {|f| ... }

read (options={})
Source

    # File lib/open-uri.rb, line 818
    def read(options={})
      self.open(options) {|f|
        str = f.read
        Meta.init str, f
        str
      }
    end

`OpenURI::OpenRead#read`([ options ]) reads a content referenced by self and returns the content as string. The string is extended with `OpenURI::Meta`. The argument `options` is same as `OpenURI::OpenRead#open`.