如何使服务器发送的事件(SSE)通过Zuul Proxy spring-boot 2.1.1工作 [英] How to make Server sent events (SSE) work trough Zuul Proxy spring-boot 2.1.1
问题描述
我在通过zuul反向代理通过SSE工作时遇到了一些问题
I have some issues getting SSE working trough my zuul reverse proxy
我的设置:
Spring boot version: 2.1.1.RELEASE
Spring cloud dependencies: Greenwich.RC1
Angular-cli: Angular 7
Kotlin: 1.3.11
os: Linux
我有一个使用SSE的小型休息服务
I have a small rest service that uses SSE
@SpringBootApplication
@RestController
@CrossOrigin("http://localhost:19195")
class RestApplication {
private final val processor = DirectProcessor.create<Int>().serialize()
private final val sink = processor.sink()
private final val counter = AtomicInteger()
@GetMapping("/stream")
fun stream(): Flux<ServerSentEvent<Int>> {
println("Stream connected")
return processor.map { n -> ServerSentEvent.builder<Int>(n).build() }
}
@GetMapping("/increment")
fun sink() {
sink.next(counter.incrementAndGet())
}
}
如果我的EventSource从我的角度服务直接连接到它，这将很好工作:
This works fine if my EventSource connects directly to it from my angular service:
const sse = new EventSource('http://localhost:8080/stream');
sse.onopen = (event) => {
console.log('OnOpen ' + event);
};
sse.onmessage = (event) => {
console.log(event);
sse.onerror = (error) => {
console.log(error);
};
如果我点击/increment端点，则该服务会接收到具有递增值的sse事件.
If I hit the /increment endpoint the service receives sse events with incrementing values.
现在使用此zuul配置:
Now with this zuul config:
zuul:
sensitive-headers:
routes:
rest:
path: /rest/**
url: http://192.168.75.90:8080
add-proxy-headers: true
add-host-header: true
Angular服务已更新为通过代理:
Angular service updated to go via proxy:
const sse = new EventSource('rest/stream');
sse.onopen = (event) => {
console.log('OnOpen ' + event);
};
sse.onmessage = (event) => {
console.log(event);
};
sse.onerror = (error) => {
console.log(error);
};
现在我的角度服务，连接到流，等待默认的zuul超时(10秒)，然后返回406并重新连接.那就是如果我没有数据.
Now my angular service, connects to the stream, waits for the default zuul timeout (10 seconds) then returns a 406 and reconnects. That is if i have no data.
如果我在接收器中有数据，它会连接到sse流，并且只要我将数据推入流中就不会发生任何事情.当我停止推送数据时，EventSource等待zuul超时(10秒)，然后接收流中的所有数据并断开连接/重新连接.
If i have data in the sink, it connects to the sse stream and nothing happens as long as i am pushing data onto the stream. When I stop pushing data EventSource waits for zuul timeout (10 seconds) then receives all data on stream and disconnects/reconnects.
我知道zuul 1.x不支持SSE，但是我希望与Spring Boot 2.1.1捆绑在一起的zuul可以.
I am aware that zuul 1.x does not support SSE, but I was hoping the zuul bundeled with spring boot 2.1.1 would.
有人知道吗?
推荐答案
问题是您正在使用Zuul 1.x，即使您使用的是Springboot版本2.x.我遇到了同样的问题，似乎Spring Cloud Netflix当前和将来都将不支持Zuul2.x.因此，当您使用Spring Cloud环境时，我建议切换到 spring-cloud-gateway .我将它与SSE一起使用，并且对当前的解决方案感到满意.另一种选择是直接切换到Zuul 2.0.
The problem is you are using Zuul 1.x, even if you are using springboot version 2.x. I had the same problem and as it seems Spring Cloud Netflix will not support Zuul 2.x currently and in the future. So when you are using the spring cloud environment, i would suggest to switch to spring-cloud-gateway. I am using it with SSE and i am satisfied with the current solution. Another choice would be to switch over to Zuul 2.0 directly.
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