1 files changed, 37 insertions, 0 deletions
diff --git a/src/dict2rest/deflate.go b/src/dict2rest/deflate.go
new file mode 100644
index 0000000..7173d22
--- /dev/null
+++ b/src/dict2rest/deflate.go
@@ -0,0 +1,37 @@
+package main
+
+import (
+	"compress/flate"
+	"io"
+	"net/http"
+	"strings"
+)
+
+// DEFLATE Compression
+type flateResponseWriter struct {
+	io.Writer
+	http.ResponseWriter
+}
+
+func (w flateResponseWriter) Write(b []byte) (int, error) {
+	return w.Writer.Write(b)
+}
+
+func Deflate(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if !strings.Contains(req.Header.Get("Accept-Encoding"), "deflate") {
+			// If deflate is unsupported, revert to standard handler.
+			next.ServeHTTP(w, req)
+			return
+		}
+		w.Header().Set("Content-Encoding", "deflate")
+		fl, err := flate.NewWriter(w, -1) // Use default compression level
+		if err != nil {
+			next.ServeHTTP(w, req)
+			return
+		}
+		defer fl.Close()
+		flw := flateResponseWriter{Writer: fl, ResponseWriter: w}
+		next.ServeHTTP(flw, req)
+	})
+}