Putting delay on html parser node

Hi Dear Knime Users :)

I am trying to visit html  links and parse that data.

For doing that ,

I created a  excel source which has 10.000 url. and then Http Retreiver node ->Html Parser node   -> Xpath

here is my question. when i run workflow. my result set is changing all the time, some web sites return that i want but some of them retuning  statusCode=500 when i try to visit url on my browser i can get the results.

but  it takes more than 2 seconds to getting results. I thing this is the problem. how can i put some delays for every url respons for this node?

i tryed to change and increase Http Retreiver node's parameters but it didnt solve my problem.

Any idea ?