Gin In linux, the sent SSE packet is blocked until I finish sending. What is the reason for this？

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Description

How to reproduce

route.POST("/v1/complete", complete)

func complete(ctx *gin.Context, content string) {
...

if _, err := ctx.Writer.Write([]byte("\n\ndata: {\"completion\": \"" + strings.ReplaceAll(content, "\n", "\\n") + "\"}")); err != nil {
    fmt.Println("Error: ", err)
} else {
    ctx.Writer.Flush()
}

}

Expectations

$ curl http://localhost:9000/v1/complete

data: {  "completion": "xxx"}
data: [DONE]

Actual result

$ curl -i http://localhost:9000/hello/world
<YOUR RESULT>

Environment

go version: 1.20+
gin version (or commit ref): v1.9.1
operating system: Linux amd64

Comment From: Rorke76753

hi any idea for this problem? how you resolve this issue

Comment From: bincooo

hi any idea for this problem? how you resolve this issue

The reason is that I forgot the response request header:

ctx.Writer.Header().Set("Content-Type", "text/event-stream")
ctx.Writer.Header().Set("Transfer-Encoding", "chunked")
ctx.Writer.Header().Set("Cache-Control", "no-cache")
ctx.Writer.Header().Set("Connection", "keep-alive")
ctx.Writer.Header().Set("X-Accel-Buffering", "no")