End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Net::HTTPHeader#key?

key?(key)

# File tmp/rubies/ruby-3.1.3/lib/net/http/header.rb, line 191
def key?(key)
  @header.key?(key.downcase.to_s)
end

true if key header exists.

See also #initialize_http_header #main_type #get_fields #proxy_basic_auth also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0