1---
2name: azure-web-pubsub
3description: 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 chat, using Socket.IO, configuring geo-replication/custom domains, 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).
4compatibility: Requires network access. Uses mcp_microsoftdocs:microsoft_docs_fetch or fetch_webpage to retrieve documentation.
5metadata:
6 generated_at: "2026-09-06"
7 generator: "docs2skills/1.0.0"
8---
9
10# Azure Web PubSub Skill
11
12This 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.
13
14## How to Use This Skill
15
16> **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
17
18> **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)
19
20This skill requires **network access** to fetch documentation content:
21- **Preferred**: Use `mcp_microsoftdocs:microsoft_docs_fetch` with query string `from=learn-agent-skill`. Returns Markdown.
22- **Fallback**: Use `fetch_webpage` with query string `from=learn-agent-skill&accept=text/markdown`. Returns Markdown.
23
24## Category Index
25
26| Category | Lines | Description |
27|----------|-------|-------------|
28| 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. |
29| 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. |
30| 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. |
31| 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. |
32| 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. |
33| Security | L72-L100 | Securing Web PubSub: auth/authorization (keys, Entra ID, certs, roles), network controls (firewalls, private endpoints, tags), key rotation, compliance, and secure outbound connectivity. |
34| Configuration | L101-L116 | Configuring Web PubSub: storage/chat setup, routing and handlers, custom domains, geo-replication, client URLs, metrics/logs, monitoring, local tunnel, MQTT/Socket.IO, and OData filters. |
35| Integrations & Coding Patterns | L117-L150 | Client/server integration patterns for Web PubSub: SDK and REST usage, chat rooms and messaging, WebSocket/MQTT, JSON/protobuf subprotocols, auth, CloudEvents, Functions, and Socket.IO integration. |
36| Deployment | L151-L156 | Guides for moving Web PubSub across regions, configuring Premium autoscale, and deploying/migrating Socket.IO apps and serverless chat to Azure Web PubSub. |
37
38### Troubleshooting
39| Topic | URL |
40|-------|-----|
41| Interpret Azure Web PubSub chat error codes | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-reference-errors |
42| Debug Azure Web PubSub event handlers locally | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-local-debug-event-handler |
43| Troubleshoot common Azure Web PubSub issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-common-issues |
44| Use Web PubSub resource logs for troubleshooting | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-troubleshoot-resource-logs |
45| Resolve common Azure Web PubSub service issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/resource-faq |
46| Troubleshoot Web PubSub for Socket.IO common issues | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-common-issues |
47| Collect diagnostic logs for Web PubSub Socket.IO | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-logging |
48
49### Best Practices
50| Topic | URL |
51|-------|-----|
52| Design reliable WebSocket clients for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-reliable-clients |
53
54### Decision Making
55| Topic | URL |
56|-------|-----|
57| Select the right Azure Web PubSub capability | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/choose-web-pubsub-capability |
58| Understand Azure Web PubSub billing model | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-billing-model |
59
60### Architecture & Design Patterns
61| Topic | URL |
62|-------|-----|
63| Design resilient multi-region Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-disaster-recovery |
64| Cross-protocol communication between MQTT and Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-mqtt-cross-protocol-communication |
65| Internal design of Web PubSub for Socket.IO support | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-service-internal |
66
67### Limits & Quotas
68| Topic | URL |
69|-------|-----|
70| Plan Web PubSub performance and capacity | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-performance |
71| Unsupported Socket.IO server APIs in Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-supported-server-apis |
72
73### Security
74| Topic | URL |
75|-------|-----|
76| Authenticate and issue tokens for Azure Web PubSub chat clients | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-authenticate |
77| Configure roles and permissions for Azure Web PubSub chat | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-roles-permissions |
78| Authorize Web PubSub access with Microsoft Entra ID | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-azure-ad-authorization |
79| Configure wildcard group role permissions in Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-wildcard-group-roles |
80| Authorize Azure Web PubSub with Entra applications | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-authorize-from-application |
81| Authorize Azure Web PubSub using managed identities | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-authorize-from-managed-identity |
82| Enable client certificate (mTLS) for Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-client-certificate |
83| Configure Azure Web PubSub Application Firewall for client control | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-configure-application-firewall |
84| Disable key-based auth for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-disable-local-auth |
85| Secure Web PubSub with Azure Application Gateway | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-integrate-app-gateway |
86| Audit Azure Web PubSub compliance with Azure Policy | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-monitor-azure-policy |
87| Manage Azure Web PubSub network access control rules | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-network-access-control |
88| Secure Azure Web PubSub with private endpoints | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-private-endpoints |
89| Rotate Azure Web PubSub access keys safely | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-rotate-access-key |
90| Secure Web PubSub outbound traffic to Azure Functions via shared private endpoints | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints |
91| Access Key Vault privately from Azure Web PubSub via shared endpoints | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints-key-vault |
92| Secure Web PubSub outbound traffic to Private Link Service | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-shared-private-endpoints-private-link-service |
93| Use Azure Web PubSub service tags for network access control | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-service-tags |
94| Authenticate WebPubSubServiceClient using Azure Identity | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-use-azure-identity |
95| Use managed identities with Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-use-managed-identity |
96| Apply built-in Azure Policy definitions to Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/policy-definitions |
97| Build serverless Web PubSub chat with client authentication | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/quickstart-serverless |
98| Authenticate with Web PubSub for Socket.IO | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-authentication |
99| Add authentication and permissions to Azure Web PubSub apps | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/tutorial-permission |
100| Authenticate and authorize MQTT clients for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/tutorial-upstream-auth-mqtt-client |
101
102### Configuration
103| Topic | URL |
104|-------|-----|
105| Configure storage and enable Azure Web PubSub chat | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-enable-chat |
106| Use metrics and alerts for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/concept-metrics |
107| Configure monitoring for Azure Web PubSub with Azure Monitor | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-azure-monitor |
108| Configure custom domains for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-custom-domain |
109| Configure Azure Web PubSub event handlers and routing | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-eventhandler |
110| Enable geo-replication for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-enable-geo-replication |
111| Reference for Azure Web PubSub monitoring metrics and logs | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-monitor-data-reference |
112| Use Azure Web PubSub local tunnel for development | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-web-pubsub-tunnel-tool |
113| CloudEvents extensions for Web PubSub MQTT handlers | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-mqtt-cloud-events |
114| Write OData filter expressions for Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-odata-filter |
115| Configure Azure Web PubSub Socket.IO serverless protocol | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-protocol |
116| Use Azure Socket.IO Admin UI for monitoring | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-troubleshoot-admin-ui |
117
118### Integrations & Coding Patterns
119| Topic | URL |
120|-------|-----|
121| Manage Azure Web PubSub chat rooms via SDK and REST | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-manage-rooms |
122| Send and manage messages in Azure Web PubSub chat | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-howto-messages |
123| Use Azure Web PubSub chat SDKs and REST APIs | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/chat-reference-sdk-and-rest |
124| Connect MQTT and WebSocket clients to Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-connect-mqtt-websocket-client |
125| Configure Azure Web PubSub client events to Event Hubs | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-develop-event-listener |
126| Generate Azure Web PubSub client access URLs | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-generate-client-access-url |
127| Implement upstream servers for Azure Web PubSub events | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-web-pubsub-write-upstream-server |
128| Create WebSocket clients | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-websocket-connect |
129| Use C# client SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-csharp |
130| Use Java client SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-java |
131| Use JavaScript client SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-javascript |
132| Use Python client SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-sdk-python |
133| Follow Azure Web PubSub client specification | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-client-specification |
134| Handle Web PubSub events via HTTP CloudEvents | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-cloud-events |
135| Handle Web PubSub events via AMQP CloudEvents | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-cloud-events-amqp |
136| Use Web PubSub triggers and bindings in Azure Functions | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-functions-bindings |
137| Implement reliable JSON WebSocket subprotocol for Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-json-reliable-webpubsub-subprotocol |
138| Use Azure Web PubSub JSON WebSocket subprotocol | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-json-webpubsub-subprotocol |
139| Implement reliable protobuf WebSocket subprotocol for Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-protobuf-reliable-webpubsub-subprotocol |
140| Use Azure Web PubSub protobuf WebSocket subprotocol | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-protobuf-webpubsub-subprotocol |
141| Use Azure Web PubSub data plane REST APIs | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-rest-api-data-plane |
142| REST API semantics for MQTT in Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-rest-api-mqtt |
143| Use .NET server SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-csharp |
144| Use Java server SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-java |
145| Use JavaScript server SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-js |
146| Use Python server SDK for Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/reference-server-sdk-python |
147| Authenticate and connect to Azure Web PubSub | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/samples-authenticate-and-connect |
148| Integrate Web PubSub for Socket.IO with API Management | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-howto-integrate-apim |
149| Use Socket.IO Azure Functions triggers and bindings | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-function-binding |
150| Integrate Web PubSub for Socket.IO into existing apps | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socketio-quickstart |
151
152### Deployment
153| Topic | URL |
154|-------|-----|
155| Move Azure Web PubSub resources across regions | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-move-across-regions |
156| Configure autoscale for Azure Web PubSub Premium | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-scale-autoscale |
157| Deploy Socket.IO Serverless chat with Azure Functions | https://learn.microsoft.com/en-us/azure/azure-web-pubsub/socket-io-serverless-quickstart |
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