What is Shib Daemon used for?

[Yaowen Tu]

Hi,

I am new to the SAML world. I just installed Shib SP and IdP, and made them
work with each other. I am now trying to understand how everything works
under the hood.

The question is: When we install SP for Apache on Windows, we can choose
whether to install Shib Daemon or not. Can anybody tells me what is that
used for? Is it optional to make SP work?

I have tried to google and searched old posts, but cannot find so much
details. My understand is Shib SP is a module that runs on Apache(for my
install), and it is responsible for:
1. Setting up trust connection with IdP
2. Handle request from browser, and redirect to IdP
3. Handle response from IdP and redirect to user's real application page.

It seems to me that Shib Daemon is not involved in these works. Did I miss
anything or I misunderstood anything?

Thanks you so much!

Best,
Yaowen
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