求助：Google API Gateway路径参数转发至CloudRun时变为查询参数

你的API Gateway配置中，路径参数{id}没有被正确替换到后端服务的路径里，而是被转为查询参数传递，这是因为默认的path_translation行为导致的。可以通过以下两种方式修正配置：

方案一：使用路径追加模式 #

将后端地址设置为Cloud Run服务的基础URL，同时指定path_translation: "APPEND_PATH_TO_ADDRESS"，让API Gateway把请求的完整路径追加到后端地址上：

paths:
  /reports/results/{id}:
    get:
      summary: Get Report Results for specified report id
      operationId: GetReportResults
      x-google-backend:
        address: https://myappapi-asldfjoiewjfv-uc.a.run.app/v1
        path_translation: "APPEND_PATH_TO_ADDRESS"
      parameters:
        - in: path
          name: id
          required: true
          type: integer
      security:
      - api_key: []
      responses:
        '200':
          description: A successful response
          schema:
            type: string

方案二：显式映射路径参数 #

保留后端地址中的路径参数占位符，通过variables字段将请求路径里的id参数映射到后端地址的对应位置：

paths:
  /reports/results/{id}:
    get:
      summary: Get Report Results for specified report id
      operationId: GetReportResults
      x-google-backend:
        address: https://myappapi-asldfjoiewjfv-uc.a.run.app/v1/reports/results/{id}
        path_translation: "CONSTANT_ADDRESS"
        variables:
          id: "$request.path.id"
      parameters:
        - in: path
          name: id
          required: true
          type: integer
      security:
      - api_key: []
      responses:
        '200':
          description: A successful response
          schema:
            type: string

原因说明 #

默认情况下，API Gateway的path_translation属性值为CONSTANT_ADDRESS，该模式会将请求中的路径参数提取为查询参数，而非替换到后端地址的路径占位符中。通过上述两种配置，可强制路径参数被正确注入到后端路径，实现你期望的转发效果。

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