1 files changed, 30 insertions, 2 deletions
diff --git a/lib/net/http/header.rb b/lib/net/http/header.rb
index 63a163afbd..d363dffca5 100644
--- a/lib/net/http/header.rb
+++ b/lib/net/http/header.rb
@@ -42,7 +42,7 @@ module Net::HTTPHeader
       @header.delete key.downcase
       return val
     end
-    @header[key.downcase] = [val]
+    set_field(key, val)
   end
 
   # [Ruby 1.8.3]
@@ -62,12 +62,40 @@ module Net::HTTPHeader
   #
   def add_field(key, val)
     if @header.key?(key.downcase)
-      @header[key.downcase].push val
+      append_field_value(@header[key.downcase], val)
     else
+      set_field(key, val)
+    end
+  end
+
+  private def set_field(key, val)
+    case val
+    when Enumerable
+      ary = []
+      append_field_value(ary, val)
+      @header[key.downcase] = ary
+    else
+      val = val.to_str
+      if /[\r\n]/.match?(val)
+        raise ArgumentError, 'header field value cannnot include CR/LF'
+      end
       @header[key.downcase] = [val]
     end
   end
 
+  private def append_field_value(ary, val)
+    case val
+    when Enumerable
+      val.each{|x| append_field_value(ary, x)}
+    else
+      val = val.to_s
+      if /[\r\n]/.match?(val)
+        raise ArgumentError, 'header field value cannnot include CR/LF'
+      end
+      ary.push val
+    end
+  end
+
   # [Ruby 1.8.3]
   # Returns an array of header field strings corresponding to the
   # case-insensitive +key+.  This method allows you to get duplicated