I wander how to establish Webdispatcher on EP with HTTPS

I wander how to establish Webdispatcher on EP with HTTPS . I
can do it for HTTP. I found releated link in SAP Library:
http://help.sap.com/saphelp_nw04/helpdata/en/d8/a922d7f45f11d5996e00508b5d5211/frameset.htm
but still I do not understand as installation sapwebdisp -bootstap asks me only for HTTP port of mesage server , instance nr for web dispatcher and HTTP port number for SAP webdispatcher.
How to deal with HTTPS?
In library (under SAP Web Dispatcher and SSL ) it is mentioned for HTTPS-HTTPS: icm/server_port_<xx>= ... PROT=HTTPS ...
wdisp/ssl_encrypt=1. Is it in sapwebdisp.pfl? I guess also on EP something should be done(I have a productive system and I would not like to spoil anything)

Is it in sapwebdisp.pfl?
Yes.
I have a productive system and I would not like to spoil anything)
You should setup the QAS environment to support webdispatcher and https first.
Be aware, that there are three different methods for https:
client https> webdispatcher -http-> SAP system
client https> webdispatcher -https-> SAP system (decrypt on webdispatcher and re-encrypt to SAP system)
client https> webdispatcher -https-> SAP system (no decryption on webdispatcher)
Often the first version is sufficient and the simplest one...
Cheers Michael

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Thanks for the reply. I think I am close, based on your instruction, I did the following but still got the same error.
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