Introduce a fast proxy mode to improve HTTP/1.1 performances with backends

Co-authored-by: Romain <rtribotte@users.noreply.github.com>
Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com>

pkg/proxy/httputil/bufferpool.go

@@ -0,0 +1,29 @@
+package httputil
+
+import "sync"
+
+const bufferSize = 32 * 1024
+
+type bufferPool struct {
+	pool sync.Pool
+}
+
+func newBufferPool() *bufferPool {
+	b := &bufferPool{
+		pool: sync.Pool{},
+	}
+
+	b.pool.New = func() interface{} {
+		return make([]byte, bufferSize)
+	}
+
+	return b
+}
+
+func (b *bufferPool) Get() []byte {
+	return b.pool.Get().([]byte)
+}
+
+func (b *bufferPool) Put(bytes []byte) {
+	b.pool.Put(bytes)
+}