GAE子域名映射后访问404错误的排查与解决

问题场景 #

• 服务标识为l2-main的ServiceA在GAE默认域名https://l2-main-dot-winky-products.uc.r.appspot.com/运行正常
• 通过dispatch.yaml配置子域名映射：

  - url: "l2.web3m.io/*"
    service: l2-main
  

• 访问子域名l2.web3m.io时出现404错误：

  404. That’s an error. The requested URL / was not found on this server. That’s all we know.

• 云平台显示域名连接状态正常

相关配置（app.yaml） #

env: standard
runtime: nodejs16
service: l2-main
handlers:
  - url: /static
    static_dir: build/static
  - url: /beta
    static_files: build/beta/index.html
    upload: build/beta/index.html
  - url: /(.*\.(json|ico|js))$
    static_files: build/\1
    upload: build/.*\.(json|ico|js)$
  - url: .*
    static_files: build/index.html
    upload: build/index.html
  - url: /favicon\.ico
    static_files: build/favicon.ico
    upload: build/favicon.ico
env_variables:
  APP_ENV: "production"
  NODE_ENV: "production"

排查结果与解决方法 #

排查后确认问题根源在于app.yaml的handlers配置中，/beta路径对应的静态文件路径build/beta/index.html存在错误。修正该路径后，子域名l2.web3m.io的访问恢复正常。

内容的提问来源于stack exchange，提问作者Shani Elkalay