Retryable failures downloading Forge builds

I noticed this this morning when a Jenkins build failed on me:

Download http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.12.2-14.23.5.2772/forge-1.12.2-14.23.5.2772-userdev.jar

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all dependencies for configuration ':forgeGradleUserDevPackage'.
> Could not download forge-userdev.jar (net.minecraftforge:forge:1.12.2-14.23.5.2772)
   > Could not close resource 'http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.12.2-14.23.5.2772/forge-1.12.2-14.23.5.2772-userdev.jar'.
      > Premature end of Content-Length delimited message body (expected: 5199526; received: 86587

Trying with wget also reports an error, but wget auto-retries and manages to get the JAR ok.  Unfortunately, gradle (as run from Jenkins above, and also from the local command-line) gives up and fails the build immediately.  This seems to be pretty reproducable and happens both on my local machine and a remote Jenkins build server.

Something up with files.minecraftforge.net?