--- net/http.rb-orig	2008-03-15 16:52:36.000000000 +0500
+++ net/http.rb	2008-03-15 16:55:42.000000000 +0500
@@ -1139,7 +1139,7 @@
       return unless initheader
       initheader.each do |key, value|
         warn "net/http: warning: duplicated HTTP header: #{key}" if key?(key) and $VERBOSE
-        @header[key.downcase] = [value.strip]
+        @header[key.downcase] = [value.to_s.strip]
       end
     end
 
@@ -1162,7 +1162,7 @@
         @header.delete key.downcase
         return val
       end
-      @header[key.downcase] = [val]
+      @header[key.downcase] = [val.to_s]
     end
 
     # [Ruby 1.8.3]
@@ -1182,9 +1182,9 @@
     #
     def add_field(key, val)
       if @header.key?(key.downcase)
-        @header[key.downcase].push val
+        @header[key.downcase].push val.to_s
       else
-        @header[key.downcase] = [val]
+        @header[key.downcase] = [val.to_s]
       end
     end