Bugfix/Add header to allow sse on nginx (#3214)

add header to allow sse on nginx

Author: HenryHengZJ

Diff for: packages/server/src/controllers/internal-predictions/index.ts

@@ -27,6 +27,7 @@ const createAndStreamInternalPrediction = async (req: Request, res: Response, ne
         res.setHeader('Content-Type', 'text/event-stream')
         res.setHeader('Cache-Control', 'no-cache')
         res.setHeader('Connection', 'keep-alive')
+        res.setHeader('X-Accel-Buffering', 'no') //nginx config: https://serverfault.com/a/801629
         res.flushHeaders()
 
         const apiResponse = await utilBuildChatflow(req, true)

Diff for: packages/server/src/controllers/predictions/index.ts

@@ -63,6 +63,7 @@ const createPrediction = async (req: Request, res: Response, next: NextFunction)
                     res.setHeader('Content-Type', 'text/event-stream')
                     res.setHeader('Cache-Control', 'no-cache')
                     res.setHeader('Connection', 'keep-alive')
+                    res.setHeader('X-Accel-Buffering', 'no') //nginx config: https://serverfault.com/a/801629
                     res.flushHeaders()
 
                     const apiResponse = await predictionsServices.buildChatflow(req)