我正在使用Node v5.0.0和npm v3.3.6，并且遇到了tar包的一个非常孤立的问题。由于企业防火墙，我被迫克隆Git存储库并从那个
安装它我的问题是，尽管迫使npm从缓存中安装软件包，tar是唯一的软件包，它坚持从npm的注册表下载它。
$ npm install tar@2.2.1 --verbose --cache-min=999999999999
npm info it worked if it ends with ok
npm verb cli [ 'C:\\Program Files\\nodejs\\node.exe',
npm verb cli 'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
npm verb cli 'install',
npm verb cli 'tar@2.2.1',
npm verb cli '--verbose',
npm verb cli '--cache-min=999999999999' ]
npm info using npm@3.3.6
npm info using node@v5.0.0
npm verb get http://registry.npmjs.org/tar not expired, no request
npm verb cache add spec tar@2.2.1
npm verb addNamed "2.2.1" is a plain semver version for tar
npm verb addNameVersion registry:http://registry.npmjs.org/tar not in flight; fetching
npm verb get http://registry.npmjs.org/tar not expired, no request
npm verb addRemoteTarball http://registry.npmjs.org/tar/-/tar-2.2.1.tgz not in flight; adding
npm verb addRemoteTarball [ 'http://registry.npmjs.org/tar/-/tar-2.2.1.tgz',
npm verb addRemoteTarball '8e4d2a256c0e2185c6b18ad694aec968b83cb1d1' ]
npm info retry fetch attempt 1 at 8:38:23 AM
npm info attempt registry request try #1 at 8:38:23 AM
npm http fetch GET http://registry.npmjs.org/tar/-/tar-2.2.1.tgz
npm verb request id b8672d43f7b2c569
npm http fetch 503 http://registry.npmjs.org/tar/-/tar-2.2.1.tgz
npm info retry will retry, error on last attempt: Error: server error 503
我已经仔细检查了我的缓存，并且可以看到tar v2.2.1实际上存在且功能正常。
$ npm cache list | grep 'tar\\2.2.1'
~\AppData\Roaming\npm-cache\tar\2.2.1
~\AppData\Roaming\npm-cache\tar\2.2.1\package
~\AppData\Roaming\npm-cache\tar\2.2.1\package.tgz
~\AppData\Roaming\npm-cache\tar\2.2.1\package\package.json
对于它的价值，我能够通过在我的依赖项文件夹中添加项目的Git存储库并在执行npm install deps/node-tar之前使用npm install来克服这个问题。但是，仍然没有解释手头的问题。