D

https://oss.sonatype.org/ 503 了：

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

发布工件到 Maven 中央库也报错：

Execution injected-nexus-deploy of goal org.sonatype.plugins:nexus-staging-maven-plugin:1.6.8:deploy failed: Method Not Allowed : entity body dump follows: Method not allowed during maintenance

15 分钟以后恢复了。