diff --git a/examples/Lua-cURL/post_stream.lua b/examples/Lua-cURL/post_stream.lua
index a10a500..1528392 100644
--- a/examples/Lua-cURL/post_stream.lua
+++ b/examples/Lua-cURL/post_stream.lua
@@ -1,47 +1,49 @@
 local cURL = require("lcurl.cURL")
 
+-- returns size and reader
+local function make_stream(ch, n, m)
+  local size = n * m
+  local i = -1
+  return size, function()
+    i = i + 1
+    if i < m then 
+      return (tostring(ch)):rep(n - 2) .. '\r\n'
+    end
+  end
+end
+
 c = cURL.easy_init()
 
 c:setopt_url("http://posttestserver.com/post.php")
 
 c:setopt_post(true)
 
+local length, reader = make_stream("a", 10, 4)
+
 c:post{-- post file from private read function
   -- Lua-cURL compatiable
   -- allows only one stream
   name = {
     file="stream.txt",
-    stream_length="5",
+    stream_length=length,
     type="text/plain",
   }
 }
 
-count = 0
-c:perform{readfunction = function(n)
-  if count < 5  then
-    count = 5
-    return "stream"
-  end
-  return nil
-end}
+c:perform{readfunction = reader}
 
+
+local length, reader = make_stream("b", 10, 4)
 c:post{-- post file from private read function
   -- define stream callback
   name = {
     file          = "stream.txt",
     type          = "text/plain",
-    stream_length = 5,
-    stream        = function()
-      if count < 5  then
-        count = 5
-        return "STREAM"
-      end
-      return nil
-    end,
+    stream_length = length,
+    stream        = reader,
   }
 }
 
-count = 0
 c:perform{}
 
 print("Done")
diff --git a/src/lua/cURL.lua b/src/lua/cURL.lua
index 355d28f..05e6f2a 100644
--- a/src/lua/cURL.lua
+++ b/src/lua/cURL.lua
@@ -83,6 +83,7 @@ function Easy:setopt_readfunction(fn, ...)
 end
 
 function Easy:perform(opt)
+  opt = opt or {}
 
   local oerror = opt.errorfunction or function(err) return nil, err end