--- !ruby/object:RI::MethodDescription 
aliases: 
- !ruby/object:RI::AliasName 
  name: has_key?
- !ruby/object:RI::AliasName 
  name: member?
- !ruby/object:RI::AliasName 
  name: key?
block_params: 
comment: 
full_name: Rack::Utils::HeaderHash#include?
is_singleton: false
name: include?
params: (k)
visibility: public
