composer Content-Length mismatch

今天在執行 :composer update 時一直提示：

本地 package.json以下：

{
    "private": true,
    "scripts": {
        "dev": "npm run development",
        "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch-poll": "npm run watch -- --watch-poll",
        "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
        "prod": "npm run production",
        "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
    },
    "devDependencies": {
        "axios": "^0.16.2",
        "bootstrap-sass": "^3.3.7",
        "cross-env": "^5.0.1",
        "jquery": "^3.1.1",
        "laravel-mix": "^1.0",
        "lodash": "^4.17.4",
        "vue": "^2.1.10"
    },
    "repositories": {
    "packagist": {
      "type": "composer",
      "url": "https://packagist.phpcomposer.com"
        }
    }
}

谷歌資料發現仍是鏡像問題：
解決以下：

composer config repo.packagist composer https://packagist.phpcomposer.com

在執行composer update OK：