springframework:httpstream

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--- springframework:httpstream [2022/01/04 14:03]
kwon37xi [Reverse Proxy(nginx) 설정]
+++ springframework:httpstream [2022/01/04 17:00] (현재)
kwon37xi [ServerSentEvent Reverse Proxy(nginx) 설정]
@@ 줄 3: / 줄 3: @@
   * [[springframework:webflux|Spring WebFlux]] 사용시 더 깔끔하다.
-===== Reverse Proxy(nginx) 설정 =====
+===== ServerSentEvent Reverse Proxy(nginx) 설정 =====
+  * [[:nginx|Ngnix]] 같은 reverse proxy 사용시에 buffering 을 끄는 등의 별도 설정이 필요하다.
   * [[https://serverfault.com/questions/801628/for-server-sent-events-sse-what-nginx-proxy-configuration-is-appropriate|For Server-Sent Events (SSE) what Nginx proxy configuration is appropriate? - Server Fault]]
-  * [[https://stackoverflow.com/questions/13672743/eventsource-server-sent-events-through-nginx|ruby - EventSource / Server-Sent Events through Nginx - Stack Overflow]]
+  * [[https://github.com/wandenberg/nginx-push-stream-module|wandenberg/nginx-push-stream-module: A pure stream http push technology for your Nginx setup. Comet made easy and really scalable.]]
   * 서버측에서 ''X-Accel-Buffering: no'' 응답 헤더를 내려주면 SSE 커넥션만 버퍼링 방지.
-  * 아니면 nginx 의 SSE 관련 url 프록시에 대해서만 ''proxy_buffering off;'' 설정.
+  * [[https://www.nginx.com/resources/wiki/start/topics/examples/x-accel/|nginx x-accel-* 헤더를 통한 응답 제어]]
+<code java>
+@RequestMapping("/sseExamples")
+public SseEmitter getRealTimeJudgeResultAction(HttpServletResponse response) throws IOException {
+    // ....
+    response.addHeader("X-Accel-Buffering", "no");
+    SseEmitter sseEmitter = new SseEmitter();
+    // ....
+    sseEmitter.send("Established");
+    return sseEmitter;
+}
+</code>
+<code>
+# 응답 결과를 보면 X-Accel-Buffering: no 헤더가 출력됨.
+curl -D - http://....
+HTTP/1.1 200
+X-Accel-Buffering: no
+Content-Type: text/event-stream
+Transfer-Encoding: chunked
+...
+</code>
+  * nginx 의 SSE 관련 url 프록시에 대해서만 ''proxy_buffering off;'' 및 기타 설정.
+  * [[https://stackoverflow.com/questions/13672743/eventsource-server-sent-events-through-nginx|ruby - EventSource / Server-Sent Events through Nginx - Stack Overflow]] - https://stackoverflow.com/a/13673298/1051402
 <code>
 location /path/to/sse {
-  proxy_pass http://chat_dev_upstream;
+  proxy_pass http://upstream;
-  proxy_buffering off;
+  proxy_buffering off; # X-Accel-Buffering: no 와 같은 효과
   proxy_cache off;
   proxy_set_header Host $host;
@@ 줄 19: / 줄 45: @@
 }
 </code>
+  * [[https://medium.com/tokopedia-engineering/server-sent-events-26f75e3a5ed2|Server Sent Events. File Upload Progress API using Server… | by Somesh Singh | Tokopedia Engineering | Medium]] : 좀 더 잘 설명돼 있는 듯.
 ===== 참고 =====
   * [[https://supawer0728.github.io/2018/03/15/spring-http-stereamings/|Spring5에서 HTTP Streaming | 기록은 재산이다]]

springframework/httpstream.1641272596.txt.gz · 마지막으로 수정됨: 2022/01/04 14:03 저자 kwon37xi