Disable buffering for guest docs SSE

src/main/kotlin/com/android/trisolarisserver/controller/GuestDocuments.kt

@@ -18,11 +18,12 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import org.springframework.core.io.FileSystemResource
 import org.springframework.http.HttpHeaders
 import org.springframework.http.HttpStatus
-import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.security.core.annotation.AuthenticationPrincipal
 import org.springframework.transaction.annotation.Transactional
 import org.springframework.web.bind.annotation.*
+import org.springframework.http.MediaType
+import jakarta.servlet.http.HttpServletResponse
 import org.springframework.web.multipart.MultipartFile
 import org.springframework.web.server.ResponseStatusException
 import java.time.OffsetDateTime
@@ -126,13 +127,16 @@ class GuestDocuments(
             .map { it.toResponse(objectMapper) }
     }
 
-    @GetMapping("/stream")
+    @GetMapping("/stream", produces = [MediaType.TEXT_EVENT_STREAM_VALUE])
     fun streamDocuments(
         @PathVariable propertyId: UUID,
         @PathVariable guestId: UUID,
-        @AuthenticationPrincipal principal: MyPrincipal?
+        @AuthenticationPrincipal principal: MyPrincipal?,
+        response: HttpServletResponse
     ): org.springframework.web.servlet.mvc.method.annotation.SseEmitter {
         requireRole(propertyAccess, propertyId, principal, Role.ADMIN, Role.MANAGER)
+        response.setHeader("Cache-Control", "no-cache")
+        response.setHeader("X-Accel-Buffering", "no")
         return guestDocumentEvents.subscribe(propertyId, guestId)
     }