refactor: optimize gzip writer pool management and resource handling (#102)

- Remove deferred function that resets and puts the gzip writer back into the pool
- Add immediate return of the gzip writer to the pool after resetting it

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

handler.go

@@ -75,10 +75,6 @@ func (g *gzipHandler) Handle(c *gin.Context) {
 	}
 
 	gz := g.gzPool.Get().(*gzip.Writer)
-	defer func() {
-		gz.Reset(io.Discard)
-		g.gzPool.Put(gz)
-	}()
 	gz.Reset(c.Writer)
 
 	c.Header(headerContentEncoding, "gzip")
@@ -98,6 +94,7 @@ func (g *gzipHandler) Handle(c *gin.Context) {
 		if c.Writer.Size() > -1 {
 			c.Header("Content-Length", strconv.Itoa(c.Writer.Size()))
 		}
+		g.gzPool.Put(gz)
 	}()
 	c.Next()
 }