1 files changed, 6 insertions, 1 deletions
diff --git a/lib/net/http.rb b/lib/net/http.rb
index dff0d238dd..512391b19f 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -1302,6 +1302,7 @@ module Net   #:nodoc:
 
     # 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
@@ -1311,13 +1312,15 @@ module Net   #:nodoc:
 
     # Iterates for each header names.
     def each_name(&block)   #:yield: +key+
+      block_given? or return enum_for(__method__)
       @header.each_key(&block)
     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
@@ -1325,6 +1328,7 @@ module Net   #:nodoc:
 
     # 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
@@ -1347,6 +1351,7 @@ module Net   #:nodoc:
 
     # 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