Index: lib/net/http.rb
===================================================================
--- lib/net/http.rb	(Revision 18645)
+++ lib/net/http.rb	(Arbeitskopie)
@@ -1214,6 +1214,7 @@
 
     # Iterates for each header names and values.
     def each_header   #:yield: +key+, +value+
+      block_given? or return enum_for(__method__)
       @header.each do |k,va|
         yield k, va.join(', ')
       end
@@ -1222,14 +1223,16 @@
     alias each each_header
 
     # Iterates for each header names.
-    def each_name(&block)   #:yield: +key+
-      @header.each_key(&block)
+    def each_name   #:yield: +key+
+      block_given? or return enum_for(__method__)
+      @header.each_key { |key| yield key }
     end
 
     alias each_key each_name
 
     # Iterates for each capitalized header names.
-    def each_capitalized_name(&block)   #:yield: +key+
+    def each_capitalized_name  #:yield: +key+
+      block_given? or return enum_for(__method__)
       @header.each_key do |k|
         yield capitalize(k)
       end
@@ -1237,6 +1240,7 @@
 
     # Iterates for each header values.
     def each_value   #:yield: +value+
+      block_given? or return enum_for(__method__)
       @header.each_value do |va|
         yield va.join(', ')
       end
@@ -1259,6 +1263,7 @@
 
     # As for #each_header, except the keys are provided in capitalized form.
     def each_capitalized
+      block_given? or return enum_for(__method__)
       @header.each do |k,v|
         yield capitalize(k), v.join(', ')
       end