Webhook Subscription - Not Verifiable Callback URL

[Naaman Campbell]

Hi,

I am unable to setup a new webhook subscription due to the following error:

{

  "message": {

    "errors": [

      {

        "code": "not verifiable",

        "field": "callback url",

        "resource": "PushSubscription"

      }

    ]

  }

}

Other posts to this forum have pointed towards problems with SSL certificates and certificate chains.

The following sites return valid results for my callback URL certificate:

• https://whatsmychaincert.com/?strobla-dev.clancampbell.id.au
  
• https://www.geocerts.com/ssl_checker
  

My callback URL is https://strobla-dev.clancampbell.id.au/imports/new 

I am unable to configure a http:// callback URL as it sits behind an AWS API Gateway + (restricted) CloudFront setup.

http:// gets redirected to https:// as well.

The alternative is to build another app to handle webhook events..

Cheers,

Naaman

[Naaman Campbell]

To workaround the AWS/HTTPS/Python issue, I have setup a working subscription using Azure Functions with Javascript.

One of my project goals is to run a serverless website and Azure Functions seemed to be one of the only providers allowing HTTP requests.

My Azure Functions code is published as a GitHub Gist:

https://gist.github.com/naamancampbell/163308a2343260541ceba999d54c734d

The AWS API Gateway FAQ states that HTTP is not supported (allowed).

I also received the "not verifiable" "callback url" error when I was not passing back a valid verification response.

It would be helpful if a better error code was returned for invalid verification responses.

My Python verification code is below for review:

if request.args.get('hub.mode') \
    and request.args.get('hub.verify_token') == 'STRAVA':
    response = jsonify({
        'hub.challenge': request.args.get('hub.challenge')})
    return make_response(response), 200

Cheers,

Naaman