Clojure Project in IDEA Cannot Reference Maven Repository http-kit
Scenario
You can find http-kit in the central repository:

But locally it just won't download:

Solution
Because this dependency belongs to http://http-kit.org/

So you need to add the repository address to Maven's settings.xml, or add it to the project's pom.xml.
Here I used the pom.xml approach:
<repositories>
<repository>
<id>Clojars Repository</id>
<name>Clojars Repository</name>
<url>https://clojars.org/repo/</url>
<releases>
<enabled>true</enabled>
</releases>
</repository>
</repositories>