Useful or not, from you.
RediStack about the dependency url

Today's afternoon, I tried to integrate the Redis to vapor 4 (my swift version is 5.4)

according to this doc , I copied the url ( .package(url: "https://gitlab.com/mordil/RediStack.git", .branch("master"))) to my Package.swift

but the complier reported an unwanted problem, it indicated :" https://gitlab.com/Mordil/RediStack: An unknown error occurred. unexpected return value from ssl handshake -9806 (-1)"

Meanwhile, I found another reference on vapor's doc (https://docs.vapor.codes/4.0/redis/overview/). Unfortunately, it was also unable to be fixed.

Finally, I attempted to substitute the "gitlab" by "github", then the dependency package can be install on my app

To be honesty, I had spent more to an hour to address this issue. so , would you mind to change the url into the right way ?

That's a useful answer
Without any help

@micezhao The RediStack package is hosted on Gitlab as that's where the development is done - this repo is just a mirror. Can you clone the package directly from Gitlab?