End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

OpenURI::Meta#content_type

content_type

# File tmp/rubies/ruby-3.0.5/lib/open-uri.rb, line 519
def content_type
  type, *_ = content_type_parse
  type || 'application/octet-stream'
end

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

See also #content_encoding #last_modified #charset also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1