如何使用 pubsub 模拟器 http API 创建订阅？

Question

启动 pubsub 模拟器后，我尝试使用 HTTP API 创建主题和订阅。创建主题成功，但我不明白为什么创建订阅失败。我是否做错了什么或者这是工具中的错误？您可以看到以下日志：

$ curl -s -X PUT http://localhost:8085/v1/projects/myproject/topics/mytopic
{
  "name": "projects/myproject/topics/mytopic"
}

$ curl -s -X PUT http://localhost:8085/v1/projects/myproject/subscriptions/mysub \
    --data '{"topic":"projects/myproject/topics/mytopic"}'
Not Found

在模拟器方面，我看到以下内容：

# create topic logs
[pubsub] Apr 29, 2020 10:37:19 AM io.gapi.emulators.grpc.GrpcServer$3 operationComplete
[pubsub] INFO: Adding handler(s) to newly registered Channel.
[pubsub] Apr 29, 2020 10:37:19 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFO: Detected non-HTTP/2 connection.
[pubsub] Apr 29, 2020 10:37:19 AM io.gapi.emulators.grpc.GrpcServer$3 operationComplete
[pubsub] INFO: Adding handler(s) to newly registered Channel.
[pubsub] Apr 29, 2020 10:37:19 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFO: Detected HTTP/2 connection.

# create subscription logs
[pubsub] Apr 29, 2020 10:37:27 AM io.gapi.emulators.grpc.GrpcServer$3 operationComplete
[pubsub] INFO: Adding handler(s) to newly registered Channel.
[pubsub] Apr 29, 2020 10:37:27 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
[pubsub] INFO: Detected non-HTTP/2 connection.
[pubsub] Apr 29, 2020 10:37:27 AM io.gapi.emulators.netty.NotFoundHandler handleRequest
[pubsub] INFO: Unknown request URI: /v1/projects/myproject/subscriptions/mysub

Answer 1

即使使用上述命令创建主题（不需要内容类型），为了使用选项发送数据--data '...'，您还需要发送内容类型标头。所以下面的命令确实有效：

$ curl -s -X PUT http://localhost:8085/v1/projects/myproject/subscriptions/mysub \
    -H 'content-type: application/json' \
    --data '{"topic":"projects/myproject/topics/mytopic"}'