HttpContentCompressor#determineEncoding() consistent

Author: jkuhn1

codec-http/src/main/java/io/netty/handler/codec/http/HttpContentCompressor.java

@@ -325,16 +325,16 @@ protected String determineEncoding(String acceptEncoding) {
             }
         }
         if (starQ > 0.0f) {
-            if (brQ == -1.0f && Brotli.isAvailable()) {
+            if (brQ == -1.0f && this.brotliOptions != null) {
                 return "br";
             }
-            if (zstdQ == -1.0f && Zstd.isAvailable()) {
+            if (zstdQ == -1.0f && this.zstdOptions != null) {
                 return "zstd";
             }
-            if (gzipQ == -1.0f) {
+            if (gzipQ == -1.0f && this.gzipOptions != null) {
                 return "gzip";
             }
-            if (deflateQ == -1.0f) {
+            if (deflateQ == -1.0f && this.deflateOptions != null) {
                 return "deflate";
             }
         }