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Posted to issues@cxf.apache.org by "Ihor Zahoruiko (Jira)" <ji...@apache.org> on 2020/03/22 08:31:00 UTC
[jira] [Created] (CXF-8249) SSE client refuses to accept valid
stream
Ihor Zahoruiko created CXF-8249:
-----------------------------------
Summary: SSE client refuses to accept valid stream
Key: CXF-8249
URL: https://issues.apache.org/jira/browse/CXF-8249
Project: CXF
Issue Type: Bug
Components: JAX-RS
Affects Versions: 3.3.5
Reporter: Ihor Zahoruiko
The standard (https://www.w3.org/TR/eventsource/#parsing-an-event-stream) defines that in the stream event fields (date, event, id etc.) a space after the colon is optional, i.e. both options are valid:
{noformat}
data:test
data: test{noformat}
But SSE client does not accept stream events where format without a space after the colon (data:test).
In the class org.apache.cxf.jaxrs.sse.client.InboundSseEventProcessor line parsing is performed as
{code:java}
if (StringUtils.isEmpty(line) && builder != null) {
...
} else if (line.startsWith("event: ")) {
...
} else if (line.startsWith("id: ")) {
...
} else if (line.startsWith(": ")) {
...
} else if (line.startsWith("retry: ")) {
...
} else if (line.startsWith("data: ")) {
...
}{code}
Why?
I use Spring with the SseEmitter class to generate an event stream, something like
{code:java}
SseEmitter emitter = new SseEmitter ();
emitter.send ("test");{code}
This class generate event using format "data:test", and I can't read this events in a client application where the SSE client is used.
If I change the line by adding a space, SSE client accept event....
{code:java}
emitter.send (" test"); // adding a space to get "data: test"{code}
The SSE client in the client application:
{code:java}
try (SseEventSource source = SseEventSource.target(someurl).build()) {
source.register(
(inboundSseEvent) -> System.out.println(inboundSseEvent.readData()
);
source.open();
} catch (Exception ex) {
}{code}
Dependency in pom.xml
{code:java}
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-client</artifactId>
<version>3.3.5</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-sse</artifactId>
<version>3.3.5</version>
</dependency>{code}
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