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A comparison of PUSH technologies that deliver real‑time updates without polling, including SSE, WebSockets, MQTT, Long‑Polling, and Web Push.
 
Dex (talk | contribs)
121 edits
A comparison of PUSH technologies that deliver real‑time updates without polling, including SSE, WebSockets, MQTT, Long‑Polling, and Web Push.
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PUSH Technologies: An Overview
{{DISPLAYTITLE:PUSH Technologies: An Overview}}
{{ShortDescription|A clear, practical comparison of real-time PUSH technologies used across modern and legacy hybrid systems.}}
{{Infobox PublicTech
| title        = PUSH Technologies: An Overview
| expertise    = Systems Architecture • Web Engineering • Real-Time Communication
| area        = [[Category:Architecture]] [[Category:Standards]] [[Category:Real-Time Systems]]
| updated      = 2026-02-05
}}


A clear, practical comparison of real-time PUSH technologies used across modern and legacy hybrid systems.
'''PUSH technologies''' allow servers to deliver updates to clients instantly when data changes, without requiring repeated polling. This article compares the major PUSH mechanisms—Server-Sent Events, WebSockets, MQTT, Long‑Polling, and Web Push—explaining how each works, where they fit, and how to choose between them. It also covers the universal PUSH lifecycle, architectural patterns, and practical considerations.


PUSH technologies allow servers to deliver updates to clients instantly when data changes, without requiring repeated polling. This overview covers major PUSH mechanisms—Server-Sent Events, WebSockets, MQTT, Long‑Polling, and Web Push—explaining how each works and where they fit.
== What “PUSH” Means ==
PUSH reverses the traditional HTTP request/response flow by enabling servers to send updates the moment something meaningful happens. This requires:
* a persistent or semi‑persistent channel
* a subscription mechanism
* a delivery engine
* event triggers


WHAT “PUSH” MEANS
== Summary Comparison Table ==
PUSH reverses the traditional HTTP request/response flow by enabling servers to send updates the moment something meaningful happens. This requires a persistent or semi‑persistent channel, a subscription mechanism, a delivery engine, and triggers that publish events.
{| class="wikitable"
! Technology !! Directionality !! Ideal Use Cases !! Complexity !! PHP-Friendly?
|-
| SSE || Server→Client || Notifications, dashboards, workflow updates || Low || Medium (with tuning)
|-
| WebSockets || Full-duplex || Chat, collaboration, presence || Medium–High || Low
|-
| MQTT || Pub/Sub || IoT, sensors, distributed systems || Medium || Excellent
|-
| Long-polling || Simulated PUSH || Legacy fallback || Low || Excellent
|-
| Web Push || Server→Browser || Notifications outside browser || Medium || Excellent
|}


SUMMARY COMPARISON
== Major PUSH Technologies ==
SSE: One-way, ideal for notifications and dashboards, low complexity.
=== Server-Sent Events (SSE) ===
WebSockets: Full‑duplex, ideal for chat and collaboration, medium–high complexity.
Lightweight one-way PUSH over a long-lived HTTP connection.
MQTT: Pub/Sub, ideal for IoT and distributed systems, medium complexity.
Strengths: simple, efficient, REST-friendly.
Long‑polling: Legacy fallback with high overhead.
Limitations: one-way only; PHP-FPM tuning required.
Web Push: Browser notifications even when inactive.


MAJOR PUSH TECHNOLOGIES
=== WebSockets ===
Full-duplex real-time communication.
Strengths: low-latency, binary support.
Limitations: needs event-driven runtime.


Server‑Sent Events (SSE)
=== Long-Polling ===
Lightweight one-way PUSH over a long-lived HTTP connection with built‑in reconnection.
Held-open requests until change.
Strengths: Simple, efficient, REST-friendly.
Strengths: universal fallback.
Limitations: One-way only; PHP-FPM must be tuned.
Limitations: inefficient at scale.


WebSockets
=== MQTT ===
Full-duplex real-time communication via HTTP Upgrade.
Pub/sub protocol designed for IoT and telemetry.
Strengths: Low-latency, binary support.
Strengths: massive scalability, durable subscriptions.
Limitations: Requires event-driven server; PHP-FPM unsuitable.
Limitations: requires broker, not browser-native.


Long-Polling
=== Web Push API ===
Server holds request until event occurs.
Notification delivery even when browser is closed.
Strengths: Universal fallback.
Strengths: great for user-centric alerts.
Limitations: High request churn; inefficient.
Limitations: not for continuous streams.


MQTT
== Universal PUSH Lifecycle ==
Lightweight publish/subscribe protocol.
Strengths: Scales massively; ideal for IoT and telemetry.
Limitations: Requires broker; not native in browsers.
 
Web Push API
Browser push via service workers.
Strengths: Works when page is closed.
Limitations: Not for continuous streaming.
 
UNIVERSAL PUSH LIFECYCLE
1. Discovery/Intent
1. Discovery/Intent
2. Channel Establishment
2. Channel Establishment
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4. Delivery
4. Delivery


ARCHITECTURE PATTERNS
== Architecture Patterns ==
PHP handles authentication, topic negotiation, and event publishing.
PHP handles authentication, subscription negotiation, and event publishing.
Push daemon (Perl/Node.js/etc.) handles persistent connections and delivery.
A dedicated push daemon (Perl/Node.js/etc.) maintains persistent connections and fan-out.
 
=== Diagram ===
```
Client → PHP API → Redis/Queue → PUSH Daemon → Client
```
 
== When to Use What ==
* Use SSE for simple one-way notifications.
* Use WebSockets for collaborative apps.
* Use MQTT for IoT/distributed messaging.
* Use Long-polling for legacy compat.
* Use Web Push for browser notifications.


WHEN TO USE WHAT
== References ==
Use SSE when you need simple one-way notifications.
* Server-Sent Events — WHATWG
Use WebSockets for chat or collaborative apps.
* WebSockets — RFC 6455
Use MQTT for IoT and distributed messaging.
* MQTT v5 — OASIS
Use Long-polling for legacy systems.
* Push API — W3C
Use Web Push for browser notifications.
* Web Push Protocol — RFC 8030


REFERENCES
[[Category:Architecture]] [[Category:Standards]] [[Category:Real-Time Systems]] [[Category:Dex White]]
Server-Sent Events — WHATWG
WebSockets Protocol — RFC 6455
MQTT v5.0 — OASIS Standard
Push API — W3C Recommendation
Web Push Protocol — RFC 8030

Revision as of 10:13, 5 February 2026

Template:ShortDescription Template:Infobox PublicTech

PUSH technologies allow servers to deliver updates to clients instantly when data changes, without requiring repeated polling. This article compares the major PUSH mechanisms—Server-Sent Events, WebSockets, MQTT, Long‑Polling, and Web Push—explaining how each works, where they fit, and how to choose between them. It also covers the universal PUSH lifecycle, architectural patterns, and practical considerations.

What “PUSH” Means

PUSH reverses the traditional HTTP request/response flow by enabling servers to send updates the moment something meaningful happens. This requires:

  • a persistent or semi‑persistent channel
  • a subscription mechanism
  • a delivery engine
  • event triggers

Summary Comparison Table

Technology Directionality Ideal Use Cases Complexity PHP-Friendly?
SSE Server→Client Notifications, dashboards, workflow updates Low Medium (with tuning)
WebSockets Full-duplex Chat, collaboration, presence Medium–High Low
MQTT Pub/Sub IoT, sensors, distributed systems Medium Excellent
Long-polling Simulated PUSH Legacy fallback Low Excellent
Web Push Server→Browser Notifications outside browser Medium Excellent

Major PUSH Technologies

Server-Sent Events (SSE)

Lightweight one-way PUSH over a long-lived HTTP connection. Strengths: simple, efficient, REST-friendly. Limitations: one-way only; PHP-FPM tuning required.

WebSockets

Full-duplex real-time communication. Strengths: low-latency, binary support. Limitations: needs event-driven runtime.

Long-Polling

Held-open requests until change. Strengths: universal fallback. Limitations: inefficient at scale.

MQTT

Pub/sub protocol designed for IoT and telemetry. Strengths: massive scalability, durable subscriptions. Limitations: requires broker, not browser-native.

Web Push API

Notification delivery even when browser is closed. Strengths: great for user-centric alerts. Limitations: not for continuous streams.

Universal PUSH Lifecycle

1. Discovery/Intent 2. Channel Establishment 3. Subscription Registration 4. Delivery

Architecture Patterns

PHP handles authentication, subscription negotiation, and event publishing. A dedicated push daemon (Perl/Node.js/etc.) maintains persistent connections and fan-out.

Diagram

``` Client → PHP API → Redis/Queue → PUSH Daemon → Client ```

When to Use What

  • Use SSE for simple one-way notifications.
  • Use WebSockets for collaborative apps.
  • Use MQTT for IoT/distributed messaging.
  • Use Long-polling for legacy compat.
  • Use Web Push for browser notifications.

References

  • Server-Sent Events — WHATWG
  • WebSockets — RFC 6455
  • MQTT v5 — OASIS
  • Push API — W3C
  • Web Push Protocol — RFC 8030
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