James Netherton created CAMEL-23804:
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Summary: camel-platform-http-vertx: SSE (text/event-stream)
responses buffer events instead of flushing eagerly
Key: CAMEL-23804
URL: https://issues.apache.org/jira/browse/CAMEL-23804
Project: Camel
Issue Type: Improvement
Components: camel-platform-http-vertx
Reporter: James Netherton
Assignee: James Netherton
Fix For: 4.21.0
The camel-platform-http-vertx AsyncInputStream greedily fills its read buffer
(default 16KB) before emitting data to the HTTP response. For normal responses
this is fine, but for Server-Sent Events (text/event-stream) it causes all
events to batch into a single chunk instead of being delivered progressively as
they are produced.
A typical SSE event is small (100-300 bytes). The doRead method recurses via
buffer.hasRemaining() until the full buffer is filled, meaning ~50+ events get
coalesced into one write. Clients don't receive any events until either the
buffer fills or the stream closes.
This makes real-time SSE streaming non-functional on platform-http-vertx. The
A2A component documents this as a known limitation and recommends Undertow or
Jetty as a workaround, but on Quarkus platform-http is the only option.
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