Data Action - webhook receiver; 400 Bad Request

NICE CXone API & Integrations
1

Data Action’s POST to a webhook receiver is failing; getting a 400. It’s intermittent; happens maybe 1 in 10 attempts. The receiver logs show valid JSON; the platform’s error isn’t helpful.

Architect flow has a Data Action; POSTing interaction attributes to our internal system. We’re using the SDK 9.1.2; Python 3.9. The receiver is a Flask API; simple endpoint.

Data Action configuration (paraphrased)

Method: POST
URL: https://our-system.example.com/webhook-receiver
Headers: Content-Type: application/json
Request Body: ${interaction.customer.phoneNumber}

The receiver’s Flask app:

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/webhook-receiver', methods=['POST'])
def webhook_receiver():
 data = request.get_json()
 print(f"Received data: {data}") # logs look fine
 return jsonify({"status": "received"}), 200

if __name__ == '__main__':
 app.run(debug=True)

We’ve tested the receiver directly with curl; works perfectly. The platform’s error message is consistently: 400 Bad Request - malformed JSON. It isn’t malformed; it’s a simple string. Seems like the SDK or the platform is adding something; or maybe escaping it incorrectly. It’s odd; intermittent issues are the worst. The platform’s debug logs show nothing useful; just the 400. We’ve tried setting the Content-Type explicitly in the Data Action; didn’t change anything; still happens.

2

genesyscloud-client-app-sdk’s data actions can be finicky with JSON escaping - particularly nested quotes. Try this: pre-serialize the payload to a string on the Architect side, then send that string.

# Pseudo-code - Architect Data Action
payload = {
 "caseId": session.x_custom.caseId,
 "attribute1": interaction.customer.name
}
serialized_payload = json.dumps(payload)
# POST serialized_payload to webhook

We’ve seen 400s when the data action tries to handle the serialization itself. It’s a subtle bug - it looks like valid JSON on your end, but the platform’s serialization adds extra escapes. The intermittent nature points to that - it’s likely hitting it with certain data values. It’s worth a try, and it’s a quick change to test. Let me know if that stabilizes things.

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