[ci skip] doc Http::Headers methods

1 files changed, 17 insertions, 1 deletions

diff --git a/actionpack/lib/action_dispatch/http/headers.rb b/actionpack/lib/action_dispatch/http/headers.rb
index 29cd6a0c27..cd133d6b99 100644
--- a/actionpack/lib/action_dispatch/http/headers.rb
+++ b/actionpack/lib/action_dispatch/http/headers.rb
@@ -19,14 +19,16 @@ module ActionDispatch
       include Enumerable
       attr_reader :env
 
-      def initialize(env = {})
+      def initialize(env = {}) # :nodoc:
         @env = env
       end
 
+      # Returns the value for the given key mapped to @env.
       def [](key)
         @env[env_name(key)]
       end
 
+      # Set the given value for the key mapped to @env.
       def []=(key, value)
         @env[env_name(key)] = value
       end
@@ -34,6 +36,12 @@ module ActionDispatch
       def key?(key); @env.key? key; end
       alias :include? :key?
 
+
+      # Returns the value for the given key mapped to @env.
+      # If the key can’t be found, there are several options:
+      # with no other arguments, it will raise an KeyError exception;
+      # If the optional code block is specified, then that will be run and its
+      # result returned.
       def fetch(key, *args, &block)
         @env.fetch env_name(key), *args, &block
       end
@@ -42,12 +50,18 @@ module ActionDispatch
         @env.each(&block)
       end
 
+
+      # Returns a new Http::Headers instance containing the contents of
+      # <tt>headers_or_env</tt> and the original instance.
       def merge(headers_or_env)
         headers = Http::Headers.new(env.dup)
         headers.merge!(headers_or_env)
         headers
       end
 
+      # Adds the contents of <tt>headers_or_env</tt> to original instance
+      # entries with duplicate keys are overwritten with the values from
+      # <tt>headers_or_env</tt>.
       def merge!(headers_or_env)
         headers_or_env.each do |key, value|
           self[env_name(key)] = value
@@ -55,6 +69,8 @@ module ActionDispatch
       end
 
       private
+      # Converts a HTTP header name to an environment variable name if it is
+      # not contained within the headers hash.
       def env_name(key)
         key = key.to_s
         if key =~ HTTP_HEADER