Just use any kind of model, any kind of class, any kind of database that you need for your application. **FastAPI** has you covered with the dependency injection system.

## Code size { #code-size }

This example might seem verbose. Keep in mind that we are mixing security, data models, utility functions and *path operations* in the same file.

But here's the key point.

The security and dependency injection stuff is written once.

  @Test
  public void testThatFinalizerStops() {
    weaklyReferenceQueue();
    GcFinalization.awaitClear(queueReference);
  }

  /** If we don't keep a strong reference to the reference object, it won't be enqueued. */
  @Nullable FinalizableWeakReference<Object> reference;

  /** Create the FRQ in a method that goes out of scope so that we're sure it will be reclaimed. */
  private void weaklyReferenceQueue() {

		}
		if len(remainCaches) > metacacheMaxEntries {
			// Sort oldest last...
			sort.Slice(remainCaches, func(i, j int) bool {
				return remainCaches[i].lastHandout.Before(remainCaches[j].lastHandout)
			})
			// Keep first metacacheMaxEntries...
			for _, cache := range remainCaches[metacacheMaxEntries:] {
				if time.Since(cache.lastHandout) > metacacheMaxClientWait {
					remove[cache.id] = struct{}{}
				}
			}
		}
	}

            }
        }

        @Override
        public void close() throws IOException {
            writer.close();

            // there's no need to keep this stuff on disk after suite execution
            outputFile.delete();
        }
    }

        List<IHeaderMatcher> matchers = new ArrayList<>();
        matchers.add(Defaults.createDefaultMatcher());

        // BSD 4-clause stuff (is disallowed below)
        // we keep this here, in case someone adds BSD code for some reason, it should never be allowed.
        matchers.add(subStringMatcher("BSD4 ", "Original BSD License (with advertising clause)", "All advertising materials"));
        // Apache

## Attribution

            noMoreParts = true
            return null
          }

          2, 3 -> {
            // " " or "\t" Ignore whitespace and keep looking.
            whitespace = true
            continue@afterBoundaryLoop
          }

          -1 -> {
            throw ProtocolException("unexpected characters after boundary")
          }
        }

   */
  private static long fullFingerprint(byte[] bytes, int offset, int length) {
    // For lengths over 64 bytes we hash the end first, and then as we
    // loop we keep 56 bytes of state: v, w, x, y, and z.
    long x = load64(bytes, offset);
    long y = load64(bytes, offset + length - 16) ^ K1;
    long z = load64(bytes, offset + length - 56) ^ K0;
    long[] v = new long[2];

```
Client #1596980209979 left the chat
```

/// tip

The app above is a minimal and simple example to demonstrate how to handle and broadcast messages to several WebSocket connections.

But keep in mind that, as everything is handled in memory, in a single list, it will only work while the process is running, and will only work with a single process.

{* ../../docs_src/server_sent_events/tutorial005_py310.py hl[14] *}

## 기술 세부사항 { #technical-details }

FastAPI는 일부 SSE 모범 사례를 기본으로 구현합니다.

- 메시지가 없을 때는 15초마다 **"keep alive" `ping` 주석**을 보내 일부 프록시가 연결을 종료하지 않도록 합니다. [HTML 사양: Server-Sent Events](https://html.spec.whatwg.org/multipage/server-sent-events.html#authoring-notes)에서 권장합니다.
- 스트림이 **캐시되지 않도록** `Cache-Control: no-cache` 헤더를 설정합니다.