Webhooks vs Polling vs Message Queues
Select inter-system communication mechanisms: Push webhooks across SaaS boundaries, HTTP short/long polling, internal VPC message queues, HMAC-SHA256 signatures, and ingestion buffering.
01.1. Comparing the Three Communication Paradigms
Selecting how distributed systems communicate requires evaluating network boundaries, latency requirements, and infrastructure control:
- Polling (Pull): The client periodically issues HTTP
GETrequests to check for state updates.- Short Polling: Constant requests every few seconds;
99\%of responses return empty ({"status": "pending"}), generating massive CPU and egress waste. - Long Polling: The server holds the HTTP connection open until data changes or a timeout (
20s) elapses.
- Short Polling: Constant requests every few seconds;
- Webhooks (Reverse API / HTTP Push): The service provider initiates an asynchronous HTTP
POSTrequest to a subscriber's public URL when an event occurs. The gold standard for cross-organizational SaaS integrations (Stripe, GitHub, Twilio, Shopify). - Internal Message Queues (Streaming Brokers): Binary TCP protocols (Kafka, AMQP, gRPC) operating within private Virtual Private Clouds (VPCs). Capable of multi-million msg/sec throughput with sub-millisecond latencies.
Communication Protocols: Polling vs Public Webhooks vs Private Message Queues
Communication Protocols: Polling vs Public Webhooks vs Private Message Queues
Comparing request-response polling overhead with reverse HTTP webhooks and high-throughput internal VPC queues.
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