GAE PubSub PUSH results in 400, endpoint is OK otherwise

[gu...@genotek.ru]

I am starting with a push PubSub, and manually test a PUSH PubSub service. To the end I created a topic, a push subscription, and then manually submit a message from the google web console to a GAE app with a https endpoint. These manual messages result in 400 (see below) in the logs.

curl test of the same end point is working fine.

What am I missing?

This is flex environment with custom, albeit php, runtime

 {httpRequest: {

  referer:  "-"   

  remoteIp:  "10.0.0.1"   

  requestMethod:  "POST"   

  requestUrl:  "/pubsub/mypushendpoint"   

  responseSize:  "32607"   

  status:  400   

  userAgent:  "CloudPubSub-Google"   

 }

 insertId:  "XXXXXXXX"  

 jsonPayload: {

  latencySeconds:  "0.026"   

  time:  null   

  trace:  "XXXXXXX"   

 }

 labels: {

  appengine.googleapis.com/instance_name:  "XXXXXXX"   

  appengine.googleapis.com/trace_id:  "XXXXXXX"   

  compute.googleapis.com/resource_id:  "XXXXXXX"   

  compute.googleapis.com/resource_name:  "XXXXXXX"   

  compute.googleapis.com/zone:  "XXXXXXX"   

 }

 logName:  "projects/XXXXXXX/logs/appengine.googleapis.com%2Fnginx.request"  

 receiveTimestamp:  "XXXXXXX"  

 resource: {

  labels: {

   module_id:  "XXXXXXX"    

   project_id:  "XXXXXXX"    

   version_id:  "XXXXXXX"    

  }

  type:  "gae_app"   

 }

 timestamp:  "XXXXXXX"  

}

[Jordan (Cloud Platform Support)]

400 Bad Request means that your App Engine endpoint does not know how to handle the POST request from Pub/Sub. You need to configure your App Engine endpoint to accept POST requests to properly handle your pushed Pub/Sub messages.

Note that Google Groups is meant for general product discussions and not for technical support. If you require further technical support for configuring App Engine as a Pub/Sub endpoint, it is recommended to post your complete question on Stack Overflow using the supported Google Cloud tags.