refactor: improve gzip handling and optimize resource management

- Use `strings.Contains` to check for "gzip" in `Content-Encoding` header
- Combine `g.gzPool.Put(gz)` and `gz.Reset(io.Discard)` into a single deferred function

Signed-off-by: appleboy <[email protected]>

Author: appleboy

handler.go

@@ -67,7 +67,7 @@ func newGzipHandler(level int, opts ...Option) *gzipHandler {
 // and wraps the response writer with a gzipWriter. After the request is processed, it ensures the gzip.Writer
 // is properly closed and the "Content-Length" header is set based on the response size.
 func (g *gzipHandler) Handle(c *gin.Context) {
-	if fn := g.decompressFn; fn != nil && c.Request.Header.Get("Content-Encoding") == "gzip" {
+	if fn := g.decompressFn; fn != nil && strings.Contains(c.Request.Header.Get("Content-Encoding"), "gzip") {
 		fn(c)
 	}
 
@@ -78,8 +78,10 @@ func (g *gzipHandler) Handle(c *gin.Context) {
 	}
 
 	gz := g.gzPool.Get().(*gzip.Writer)
-	defer g.gzPool.Put(gz)
-	defer gz.Reset(io.Discard)
+	defer func() {
+		g.gzPool.Put(gz)
+		gz.Reset(io.Discard)
+	}()
 	gz.Reset(c.Writer)
 
 	c.Header(headerContentEncoding, "gzip")