added proxy-http-version annotation to override the HTTP/1.1 default connection type to reverse proxy backends

internal/ingress/annotations/proxy/main.go

@@ -40,6 +40,7 @@ type Config struct {
 	ProxyRedirectTo     string `json:"proxyRedirectTo"`
 	RequestBuffering    string `json:"requestBuffering"`
 	ProxyBuffering      string `json:"proxyBuffering"`
+	ProxyHTTPVersion    string `json:"proxyHTTPVersion"`
 }
 
 // Equal tests for equality between two Configuration types
@@ -95,6 +96,9 @@ func (l1 *Config) Equal(l2 *Config) bool {
 	if l1.ProxyBuffering != l2.ProxyBuffering {
 		return false
 	}
+	if l1.ProxyHTTPVersion != l2.ProxyHTTPVersion {
+		return false
+	}
 
 	return true
 }
@@ -191,5 +195,10 @@ func (a proxy) Parse(ing *networking.Ingress) (interface{}, error) {
 		config.ProxyBuffering = defBackend.ProxyBuffering
 	}
 
+	config.ProxyHTTPVersion, err = parser.GetStringAnnotation("proxy-http-version", ing)
+	if err != nil {
+		config.ProxyHTTPVersion = defBackend.ProxyHTTPVersion
+	}
+
 	return config, nil
 }

internal/ingress/annotations/proxy/main_test.go

@@ -81,6 +81,7 @@ func (m mockBackend) GetDefaultBackend() defaults.Backend {
 		ProxyNextUpstreamTries:   3,
 		ProxyRequestBuffering:    "on",
 		ProxyBuffering:           "off",
+		ProxyHTTPVersion:         "1.1",
 	}
 }
 
@@ -99,6 +100,7 @@ func TestProxy(t *testing.T) {
 	data[parser.GetAnnotationWithPrefix("proxy-next-upstream-tries")] = "3"
 	data[parser.GetAnnotationWithPrefix("proxy-request-buffering")] = "off"
 	data[parser.GetAnnotationWithPrefix("proxy-buffering")] = "on"
+	data[parser.GetAnnotationWithPrefix("proxy-http-version")] = "1.0"
 	ing.SetAnnotations(data)
 
 	i, err := NewParser(mockBackend{}).Parse(ing)
@@ -142,6 +144,9 @@ func TestProxy(t *testing.T) {
 	if p.ProxyBuffering != "on" {
 		t.Errorf("expected on as proxy-buffering but returned %v", p.ProxyBuffering)
 	}
+	if p.ProxyHTTPVersion != "1.0" {
+		t.Errorf("expected 1.0 as proxy-http-version but returned %v", p.ProxyHTTPVersion)
+	}
 }
 
 func TestProxyWithNoAnnotation(t *testing.T) {
@@ -188,4 +193,7 @@ func TestProxyWithNoAnnotation(t *testing.T) {
 	if p.RequestBuffering != "on" {
 		t.Errorf("expected on as request-buffering but returned %v", p.RequestBuffering)
 	}
+	if p.ProxyHTTPVersion != "1.1" {
+		t.Errorf("expected 1.1 as proxy-http-version but returned %v", p.ProxyHTTPVersion)
+	}
 }

internal/ingress/controller/config/config.go

@@ -437,6 +437,10 @@ type Configuration struct {
 	// Default: 1
 	ProxyStreamResponses int `json:"proxy-stream-responses,omitempty"`
 
+	// Modifies the HTTP version the proxy uses to interact with the backend.
+	// http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version
+	ProxyHTTPVersion string `json:"proxy-http-version"`
+
 	// Sets the ipv4 addresses on which the server will accept requests.
 	BindAddressIpv4 []string `json:"bind-address-ipv4,omitempty"`
 
@@ -715,6 +719,7 @@ func NewDefault() Configuration {
 			LimitRate:                0,
 			LimitRateAfter:           0,
 			ProxyBuffering:           "off",
+			ProxyHTTPVersion:         "1.1",
 		},
 		UpstreamKeepaliveConnections: 32,
 		UpstreamKeepaliveTimeout:     60,

internal/ingress/controller/controller.go

@@ -927,6 +927,7 @@ func (n *NGINXController) createServers(data []*ingress.Ingress,
 		RequestBuffering:    bdef.ProxyRequestBuffering,
 		ProxyRedirectFrom:   bdef.ProxyRedirectFrom,
 		ProxyBuffering:      bdef.ProxyBuffering,
+		ProxyHTTPVersion:    bdef.ProxyHTTPVersion,
 	}
 
 	defaultCertificate := n.cfg.FakeCertificate

internal/ingress/defaults/main.go

@@ -150,4 +150,8 @@ type Backend struct {
 	// Enables or disables buffering of responses from the proxied server.
 	// http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering
 	ProxyBuffering string `json:"proxy-buffering"`
+
+	// Modifies the HTTP version the proxy uses to interact with the backend.
+	// http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_http_version
+	ProxyHTTPVersion string `json:"proxy-http-version"`
 }