下載android程式碼過程中，提示以下錯誤：

error: Failed connect to android.googlesource.com:443;Connection refused while accessinghttps://android.googlesource.com/a/platform/frameworks/base/info/refs

fatal: HTTP request failed

error: Cannot fetch platform/tools/motodev

error: Cannot fetch platform/frameworks/base

error: Cannot fetch platform/prebuilts/sdk

error: Exited sync due to fetch errors

解決方法：編輯/etc/hosts檔案

$ vim /etc/hosts

增加下面內容，儲存（提前儲存好）：

74.125.31.82         android.googlesource.com

203.208.46.172    cache.pack.google.com

59.24.3.173           cache.pack.google.com

然後重新輸入

$ repo sync