Fix https://github.com/kataras/iris/issues/312

context.go

@@ -462,12 +462,10 @@ func (ctx *Context) Write(format string, a ...interface{}) {
 
 // Gzip accepts bytes, which are compressed to gzip format and sent to the client
 func (ctx *Context) Gzip(b []byte, status int) {
-	ctx.RequestCtx.Response.Header.Add("Content-Encoding", "gzip")
-	gzipWriter := ctx.framework.gzipWriterPool.Get().(*gzip.Writer)
-	gzipWriter.Reset(ctx.RequestCtx.Response.BodyWriter())
-	gzipWriter.Write(b)
-	gzipWriter.Close()
-	ctx.framework.gzipWriterPool.Put(gzipWriter)
+	_, err := fasthttp.WriteGzip(ctx.RequestCtx.Response.BodyWriter(), b)
+	if err == nil {
+		ctx.RequestCtx.Response.Header.Add("Content-Encoding", "gzip")
+	}
 }
 
 // RenderWithStatus builds up the response from the specified template or a response engine.

iris.go

@@ -199,10 +199,7 @@ func New(cfg ...config.Iris) *Framework {
 	// we always use 's' no 'f' because 's' is easier for me to remember because of 'station'
 	// some things never change :)
 	s := &Framework{
-		Config: &c,
-		gzipWriterPool: sync.Pool{New: func() interface{} {
-			return &gzip.Writer{}
-		}},
+		Config:    &c,
 		responses: &responseEngines{},
 		Available: make(chan bool),
 	}
@@ -852,7 +849,15 @@ func (s *Framework) URL(routeName string, args ...interface{}) (url string) {
 // Note that: each iris station has its own pool
 // see ReleaseGzip
 func (s *Framework) AcquireGzip(w io.Writer) *gzip.Writer {
-	gzipWriter := s.gzipWriterPool.Get().(*gzip.Writer)
+	v := s.gzipWriterPool.Get()
+	if v == nil {
+		gzipWriter, err := gzip.NewWriterLevel(w, gzip.DefaultCompression)
+		if err != nil {
+			return nil
+		}
+		return gzipWriter
+	}
+	gzipWriter := v.(*gzip.Writer)
 	gzipWriter.Reset(w)
 	return gzipWriter
 }

response.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/iris-contrib/errors"
+	"github.com/valyala/fasthttp"
 )
 
 type (
@@ -151,9 +152,7 @@ func (r *responseEngineMap) render(ctx *Context, obj interface{}, options ...map
 	ctx.SetContentType(ctype)
 
 	if gzipEnabled {
-		gzipWriter := ctx.framework.AcquireGzip(ctx.Response.BodyWriter())
-		defer ctx.framework.ReleaseGzip(gzipWriter)
-		_, err := gzipWriter.Write(finalResult)
+		_, err := fasthttp.WriteGzip(ctx.RequestCtx.Response.BodyWriter(), finalResult)
 		if err != nil {
 			return err
 		}

template.go

@@ -190,6 +190,7 @@ func (t *templateEngineWrapper) execute(ctx *Context, filename string, binding i
 	var out io.Writer
 	if gzipEnabled {
 		ctx.Response.Header.Add("Content-Encoding", "gzip")
+
 		gzipWriter := ctx.framework.AcquireGzip(ctx.Response.BodyWriter())
 		defer ctx.framework.ReleaseGzip(gzipWriter)
 		out = gzipWriter
@@ -197,7 +198,8 @@ func (t *templateEngineWrapper) execute(ctx *Context, filename string, binding i
 		out = ctx.Response.BodyWriter()
 	}
 
-	return t.ExecuteWriter(out, filename, binding, options...)
+	err = t.ExecuteWriter(out, filename, binding, options...)
+	return err
 }
 
 // executeToString executes a template from a specific template engine and returns its contents result as string, it doesn't renders