module OpenURI::Meta

returns a URI that is the base of relative URIs in the data. It may differ from the URI supplied by a user due to redirection.

returns a Hash that represents header fields. The Hash keys are downcased for canonicalization.

returns an Array that consists of status code and message.

returns a charset parameter in Content-Type field. It is downcased for canonicalization.

If charset parameter is not given but a block is given, the block is called and its result is returned. It can be used to guess charset.

If charset parameter and block is not given, nil is returned except text type in HTTP. In that case, “iso-8859-1” is returned as defined by RFC2616 3.7.1.

# File rake/lib/open-uri.rb, line 497
def charset
  type, *parameters = content_type_parse
  if pair = parameters.assoc('charset')
    pair.last.downcase
  elsif block_given?
    yield
  elsif type && %r{\Atext/} =~ type &&
        @base_uri && /\Ahttp\z/ =~ @base_uri.scheme
    "iso-8859-1" # RFC2616 3.7.1
  else
    nil
  end
end

returns a list of encodings in Content-Encoding field as an Array of String. The encodings are downcased for canonicalization.

# File rake/lib/open-uri.rb, line 514
def content_encoding
  v = @meta['content-encoding']
  if v && %r{\A#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?(?:,#{RE_LWS}?#{RE_TOKEN}#{RE_LWS}?)*} =~ v
    v.scan(RE_TOKEN).map {|content_coding| content_coding.downcase}
  else
    []
  end
end

returns “type/subtype” which is MIME Content-Type. It is downcased for canonicalization. Content-Type parameters are stripped.

# File rake/lib/open-uri.rb, line 482
def content_type
  type, *_ = content_type_parse
  type || 'application/octet-stream'
end

returns a Time that represents the Last-Modified field.

# File rake/lib/open-uri.rb, line 447
def last_modified
  if v = @meta['last-modified']
    Time.httpdate(v)
  else
    nil
  end
end