Add gzip-min-length as a configurable

internal/ingress/controller/config/config.go

@@ -393,6 +393,10 @@ type Configuration struct {
 	// gzip Compression Level that will be used
 	GzipLevel int `json:"gzip-level,omitempty"`
 
+	// Minimum length of responses to be sent to the client before it is eligible
+	// for gzip compression, in bytes.
+	GzipMinLength int `json:"gzip-min-length,omitempty"`
+
 	// MIME types in addition to "text/html" to compress. The special value “*” matches any MIME type.
 	// Responses with the “text/html” type are always compressed if UseGzip is enabled
 	GzipTypes string `json:"gzip-types,omitempty"`
@@ -695,6 +699,7 @@ func NewDefault() Configuration {
 		HSTSPreload:                      false,
 		IgnoreInvalidHeaders:             true,
 		GzipLevel:                        5,
+		GzipMinLength:                    256,
 		GzipTypes:                        gzipTypes,
 		KeepAlive:                        75,
 		KeepAliveRequests:                100,

internal/ingress/controller/template/configmap_test.go

@@ -65,6 +65,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 		"error-log-path":                "/var/log/test/error.log",
 		"use-gzip":                      "true",
 		"gzip-level":                    "9",
+		"gzip-min-length":               "1024",
 		"gzip-types":                    "text/html",
 		"proxy-real-ip-cidr":            "1.1.1.1/8,2.2.2.2/24",
 		"bind-address":                  "1.1.1.1,2.2.2.2,3.3.3,2001:db8:a0b:12f0::1,3731:54:65fe:2::a7,33:33:33::33::33",
@@ -85,6 +86,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 	def.ProxySendTimeout = 2
 	def.UseProxyProtocol = true
 	def.GzipLevel = 9
+	def.GzipMinLength = 1024
 	def.GzipTypes = "text/html"
 	def.ProxyRealIPCIDR = []string{"1.1.1.1/8", "2.2.2.2/24"}
 	def.BindAddressIpv4 = []string{"1.1.1.1", "2.2.2.2"}