/azure-web-pubsub

name: azure-web-pubsub
description: Expert knowledge for Azure Web PubSub development including troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when building WebSocket/MQTT or Socket.IO apps, storage-backed chat, geo-replication, or Premium autoscale, and other Azure Web PubSub related development tasks. Not for Azure SignalR Service (use azure-signalr-service), Azure Service Bus (use azure-service-bus), Azure Event Hubs (use azure-event-hubs), Azure Relay (use azure-relay).
compatibility: Requires network access. Uses mcp_microsoftdocs:microsoft_docs_fetch or fetch_webpage to retrieve documentation.
metadata:
  generated_at: "2026-08-09"
  generator: "docs2skills/1.0.0"

Azure Web PubSub Skill

This skill provides expert guidance for Azure Web PubSub. Covers troubleshooting, best practices, decision making, architecture & design patterns, limits & quotas, security, configuration, integrations & coding patterns, and deployment. It combines local quick-reference content with remote documentation fetching capabilities.

How to Use This Skill

> **IMPORTANT for Agent**: Use the **Category Index** below to locate relevant sections. For categories with line ranges (e.g., `L35-L120`), use `read_file` with the specified lines. For categories with file links (e.g., `[security.md](security.md)`), use `read_file` on the linked reference file

> **IMPORTANT for Agent**: If `metadata.generated_at` is more than 3 months old, suggest the user pull the latest version from the repository. If `mcp_microsoftdocs` tools are not available, suggest the user install it: [Installation Guide](https://github.com/MicrosoftDocs/mcp/blob/main/README.md)

This skill requires **network access** to fetch documentation content:

• **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
• **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.

Category Index

| Category | Lines | Description | |----------|-------|-------------| | Troubleshooting | L37-L47 | Diagnosing and fixing Web PubSub errors, event handler/debug issues, service and Socket.IO problems, using resource/diagnostic logs and error codes for troubleshooting. | | Best Practices | L48-L52 | Guidance on building resilient WebSocket clients for Azure Web PubSub, including reconnection strategies, handling disconnects, error handling, and connection lifecycle best practices. | | Decision Making | L53-L58 | Guidance on choosing the right Web PubSub feature set for your scenario and understanding pricing, quotas, and cost drivers in the Azure Web PubSub billing model. | | Architecture & Design Patterns | L59-L65 | Architectural patterns for Web PubSub: multi-region resiliency, bridging MQTT with WebSocket/Web PubSub, and understanding Socket.IO support internals for integration design. | | Limits & Quotas | L66-L71 | Capacity and performance limits for Web PubSub (connections, messages, scaling) and which Socket.IO server APIs aren’t supported or behave differently. | | Security | L72-L103 | Securing Web PubSub: authN/Z for chat, Socket.IO, MQTT; roles/permissions; Entra ID and managed identities; mTLS and WAF; keys/Key Vault; private endpoints, service tags, and network access controls. | | Configuration | L104-L120 | Configuring Web PubSub instances: storage-backed chat, metrics/alerts, Azure Monitor, custom domains, event routing, geo-replication, client URLs, local tunneling, MQTT/Socket.IO options, and OData filters. | | Integrations & Coding Patterns | L121-L153 | Client/server integration patterns for Web PubSub: SDK and REST usage, WebSocket/MQTT, JSON/protobuf subprotocols, events via CloudEvents/Functions, auth, and Socket.IO integration. | | Deployment | L154-L160 | Guides for moving Web PubSub across regions, configuring Premium autoscale, and deploying/migrating Socket.IO apps and serverless chat to Azure Web PubSub. |

Troubleshooting

| Topic | URL | |-------|-----| | Interpret Azure Web PubSub chat error codes | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-reference-errors | | Debug Azure Web PubSub event handlers locally | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-local-debug-event-handler | | Troubleshoot common Azure Web PubSub issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-common-issues | | Use Web PubSub resource logs for troubleshooting | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-resource-logs | | Resolve common Azure Web PubSub service issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/resource-faq | | Troubleshoot Web PubSub for Socket.IO common issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-common-issues | | Collect diagnostic logs for Web PubSub Socket.IO | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-logging |

Best Practices

| Topic | URL | |-------|-----| | Design reliable WebSocket clients for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-reliable-clients |

Decision Making

| Topic | URL | |-------|-----| | Select the right Azure Web PubSub capability | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/choose-web-pubsub-capability | | Understand Azure Web PubSub billing model | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-billing-model |

Architecture & Design Patterns

| Topic | URL | |-------|-----| | Design resilient multi-region Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-disaster-recovery | | Cross-protocol communication between MQTT and Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-mqtt-cross-protocol-communic