refactor: refactor WithDecompressOnly function and update related t…

…ests

- Remove the boolean parameter from `WithDecompressOnly` function
- Update `WithDecompressOnly` function to always set `DecompressOnly` to true
- Update test cases to use the modified `WithDecompressOnly` function
- Improve the documentation for `WithDecompressOnly` function

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

gzip_test.go

@@ -261,7 +261,7 @@ func TestDecompressOnly(t *testing.T) {
 	req.Header.Add("Content-Encoding", "gzip")
 
 	router := gin.New()
-	router.Use(Gzip(NoCompression, WithDecompressOnly(true), WithDecompressFn(DefaultDecompressHandle)))
+	router.Use(Gzip(NoCompression, WithDecompressOnly(), WithDecompressFn(DefaultDecompressHandle)))
 	router.POST("/", func(c *gin.Context) {
 		if v := c.Request.Header.Get("Content-Encoding"); v != "" {
 			t.Errorf("unexpected `Content-Encoding`: %s header", v)
@@ -300,7 +300,7 @@ func TestGzipWithDecompressOnly(t *testing.T) {
 	req.Header.Add("Accept-Encoding", "gzip")
 
 	r := gin.New()
-	r.Use(Gzip(NoCompression, WithDecompressOnly(true), WithDecompressFn(DefaultDecompressHandle)))
+	r.Use(Gzip(NoCompression, WithDecompressOnly(), WithDecompressFn(DefaultDecompressHandle)))
 	r.POST("/", func(c *gin.Context) {
 		assert.Equal(t, c.Request.Header.Get("Content-Encoding"), "")
 		assert.Equal(t, c.Request.Header.Get("Content-Length"), "")

options.go

@@ -52,10 +52,13 @@ func WithDecompressFn(decompressFn func(c *gin.Context)) Option {
 	}
 }
 
-// disable compression, only decompress incoming request
-func WithDecompressOnly(decompressOnly bool) Option {
+// WithDecompressOnly is an option that configures the gzip middleware to only
+// decompress incoming requests without compressing the responses. When this
+// option is enabled, the middleware will set the DecompressOnly field of the
+// Options struct to true.
+func WithDecompressOnly() Option {
 	return func(o *Options) {
-		o.DecompressOnly = decompressOnly
+		o.DecompressOnly = true
 	}
 }