I understand that you are trying to create Airflow DAG using Cloud 
Composer, however you are encountering the error presented.

Were you able to create the Airflow DAG previously in your Composer 
environment without issues? Due to the nature of error message this could 
simply be a transient issue as the error mentions "You may retry the 
operation later". That being said, would you be able to try to recreate the 
Airflow DAG and see if this issue persists.

If the error message is still showing up, this issue would require a 
further investigation and inspection of your project resources, I would 
like to invite you to create a public issue tracker [1] in order to look 
into this error further.

[1] https://cloud.google.com/support/docs/issue-trackers

On Monday, February 15, 2021 at 12:56:52 PM UTC-5 [email protected] 
wrote:

> Hi,
>
> I have tried creating Airflow DAG using Cloud Composer, but getting below 
> error. Please let me know how to go about it
>
> Http error status code: 400 Http error message: BAD REQUEST Errors in: 
> [Web server]; Error messages: Creation of airflow web server version 
> failed. This may be an intermittent issue of the App Engine service. You 
> may retry the operation later. 
> {"ResourceType":"appengine.v1.version","ResourceErrorCode":"504","ResourceErrorMessage":"Timed
>  
> out waiting for the flex deployment to become network provisioned."}
>
> Regards,
> Anagha Bharadwaj
>

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