Issue using server side events support

[maggie44]

When I use SSEs without compression, I get each message flushed back one at a time. When I enable the compression it seems to continue to buffer instead of flushing the data back.

Here is a small example to replicate:

curl -N http://localhost:8090
curl -N --output --compressed http://localhost:8090

package main

import (
	"fmt"
	"time"

	"github.com/CAFxX/httpcompression"
	"github.com/gin-gonic/gin"
	wraphh "github.com/turtlemonvh/gin-wraphh"
)

func main() {
	r := gin.Default()

	compress, err := httpcompression.DefaultAdapter()
	if err != nil {
		panic(err)
	}

	r.Use(wraphh.WrapHH(compress))

	r.GET("/", func(c *gin.Context) {
		// Set the appropriate headers for SSE
		c.Writer.Header().Set("Content-Type", "text/event-stream")
		c.Writer.Header().Set("Cache-Control", "no-cache")
		c.Writer.Header().Set("Connection", "keep-alive")

		// Create a channel to send updates to the client
		updateCh := make(chan string)
		defer close(updateCh)

		// Start a goroutine to send updates
		go sendUpdates(c.Writer, updateCh)

		// Simulate sending updates every second
		for {
			updateCh <- "Hello, World! " + time.Now().Format("2006-01-02 15:04:05")
			time.Sleep(1 * time.Second)
		}
	})

	r.Run("0.0.0.0:8090")
}

func sendUpdates(w gin.ResponseWriter, updateCh <-chan string) {
	for update := range updateCh {
		// Write the update to the client
		fmt.Fprintf(w, "data: %s\n\n", update)
		w.Flush()
	}
}