Streaming API Developer Guide

Getting Started with Streaming API
Code Examples
Client Connection Considerations
PushTopic Events (Legacy)
Generic Events (Legacy)
Replay Generic Streaming Events with Durable Generic Streaming
Generic Streaming Quick Start
Generic Streaming Allocations
Reference: StreamingChannel
Reference: Streaming Channel Push REST API
Monitoring Event Usage
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Replay Generic Streaming Events with Durable Generic Streaming

A client can receive generic streaming events after it subscribes to a channel and as long as the Salesforce session is active. Events sent before a client subscribes to a channel or after a subscribed client disconnects from the Salesforce session are missed. However, a client can fetch the missed events within the 24-hour retention window by using Durable Generic Streaming.

For more information about durable events, see Message Durability.

Code Sample

See theses code samples about replaying generic streaming events.