Maven 3.8.1+阻擋HTTP repositories(Blocked mirror for repositories)

問題：

Maven無法下載私服套件，錯誤訊息如下：

[ERROR] Failed to execute goal on project xxx: Could not resolve dependencies for project xxx:jar:1.5: Failed to collect dependencies at xxx:jar:1.0: Failed to read artifact descriptor for xxx:jar:1.0: Could not transfer artifact xxx:pom:1.0 from/to maven-default-http-blocker (http://0.0.0.0/): Blocked mirror for repositories: [ooo (http://maven.ooo.org/nexus/content/repositories/ooo, default, releases)] -> [Help 1]

因為3.8.1+預設阻擋非HTTPS的倉庫。(來源)

解法：

在${user.home}/.m2/settings.xml新增以下內容

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.2.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0
    https://maven.apache.org/xsd/settings-1.2.0.xsd">
  <mirrors>
    <mirror>
      <id>maven-default-http-blocker</id>
      <mirrorOf>dummy</mirrorOf>
      <name>Pseudo repository to mirror external repositories initially using HTTP.</name>

      <url>http://0.0.0.0/</url>
      <blocked>false</blocked>
    </mirror>
  </mirrors>
</settings>

參考來源：How to disable maven blocking external HTTP repositories?