Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2474#issuecomment-56896479
When I wiped out my `lib_managed/jars` directory and ran `sbt/sbt clean
package` followed by an interactive sbt session where I ran
```
project core
test-only org.apache.spark.ui.UISuite
```
then it looks like `httpclient-4.1.3.jar` somehow gets downloaded into
`lib_managed` and ends up on the classpath during tests, even though nothing
seems to depend on it, at least according to `dependency-graph`. This is
puzzling.
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