diff --git a/Makefile b/Makefile
index 95c5f0a4..cbbd0339 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@
 
 BIN_NAME :=krakend
 OS := $(shell uname | tr '[:upper:]' '[:lower:]')
-VERSION := 1.3.0
+VERSION := 1.4.0
 PKGNAME := krakend
 LICENSE := Apache 2.0
 VENDOR=
@@ -18,7 +18,7 @@ DESC := High performance API gateway. Aggregate, filter, manipulate and add midd
 MAINTAINER := Daniel Ortiz <dortiz@devops.faith>
 DOCKER_WDIR := /tmp/fpm
 DOCKER_FPM := devopsfaith/fpm
-GOLANG_VERSION := 1.15.8
+GOLANG_VERSION := 1.16.4
 
 FPM_OPTS=-s dir -v $(VERSION) -n $(PKGNAME) \
   --license "$(LICENSE)" \
diff --git a/tests/fixtures/specs/backend_301.json b/tests/fixtures/specs/backend_301.json
index 79a62eed..f8bec94d 100644
--- a/tests/fixtures/specs/backend_301.json
+++ b/tests/fixtures/specs/backend_301.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=301\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"301\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=301\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"301\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/backend_302.json b/tests/fixtures/specs/backend_302.json
index 2882b920..af96c7c5 100644
--- a/tests/fixtures/specs/backend_302.json
+++ b/tests/fixtures/specs/backend_302.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=302\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"302\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=302\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"302\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/backend_303.json b/tests/fixtures/specs/backend_303.json
index 4d288422..17e919ee 100644
--- a/tests/fixtures/specs/backend_303.json
+++ b/tests/fixtures/specs/backend_303.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=303\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"303\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=303\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"303\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/backend_307.json b/tests/fixtures/specs/backend_307.json
index 49f5dd3b..cfe79162 100644
--- a/tests/fixtures/specs/backend_307.json
+++ b/tests/fixtures/specs/backend_307.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=307\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"307\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Referer\":[\"http://127.0.0.1:8081/redirect/?status=307\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{\"status\":[\"307\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/cors_5.json b/tests/fixtures/specs/cors_5.json
index ba57cae6..fa629016 100644
--- a/tests/fixtures/specs/cors_5.json
+++ b/tests/fixtures/specs/cors_5.json
@@ -9,12 +9,12 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
 			"X-Krakend-Completed": ["true"],
-			"X-Krakend": ["Version 1.3.0"],
+			"X-Krakend": ["Version 1.4.0"],
 			"Vary": ["Origin","Origin"],
 			"Access-Control-Allow-Origin": ["*"],
 			"Access-Control-Expose-Headers": ["Content-Length"]
diff --git a/tests/fixtures/specs/detail_error.json b/tests/fixtures/specs/detail_error.json
index 6238f0c9..8ed81bc3 100644
--- a/tests/fixtures/specs/detail_error.json
+++ b/tests/fixtures/specs/detail_error.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"error_backend_b\":{\"http_status_code\":404,\"http_body\":\"404 page not found\\n\"},\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{}}",
+		"body": "{\"error_backend_b\":{\"http_status_code\":404,\"http_body\":\"404 page not found\\n\"},\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": [""],
diff --git a/tests/fixtures/specs/no-op.json b/tests/fixtures/specs/no-op.json
index 880d7456..5bd6a15d 100644
--- a/tests/fixtures/specs/no-op.json
+++ b/tests/fixtures/specs/no-op.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Content-Length\":[\"0\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{}}\n",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Content-Length\":[\"0\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/\",\"query\":{}}\n",
 		"header": {
 			"content-type": ["application/json"],
 			"Cache-Control": [""],
diff --git a/tests/fixtures/specs/param_forwarding_1.json b/tests/fixtures/specs/param_forwarding_1.json
index 5b2983c3..3b510218 100644
--- a/tests/fixtures/specs/param_forwarding_1.json
+++ b/tests/fixtures/specs/param_forwarding_1.json
@@ -10,7 +10,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/param_forwarding_2.json b/tests/fixtures/specs/param_forwarding_2.json
index c7e562b8..091fd549 100644
--- a/tests/fixtures/specs/param_forwarding_2.json
+++ b/tests/fixtures/specs/param_forwarding_2.json
@@ -10,7 +10,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"A-B-C\":[\"ignore\"],\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"Go-http-client/1.1\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Forwarded-Via\":[\"KrakenD Version 1.3.0\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"A-B-C\":[\"ignore\"],\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"Go-http-client/1.1\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Forwarded-Via\":[\"KrakenD Version 1.4.0\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/param_forwarding_3.json b/tests/fixtures/specs/param_forwarding_3.json
index a47ddcc3..718197a6 100644
--- a/tests/fixtures/specs/param_forwarding_3.json
+++ b/tests/fixtures/specs/param_forwarding_3.json
@@ -10,7 +10,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/param_forwarding_4.json b/tests/fixtures/specs/param_forwarding_4.json
index f667072f..6fc020e0 100644
--- a/tests/fixtures/specs/param_forwarding_4.json
+++ b/tests/fixtures/specs/param_forwarding_4.json
@@ -10,7 +10,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"Content-Length\":[\"0\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"Authorization\":[\"bearer 123456\"],\"Content-Length\":[\"0\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"],\"X-Y-Z\":[\"true\"]},\"path\":\"/param_forwarding/bar\",\"query\":{\"foo\":[\"foo\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/query_forwarding_1.json b/tests/fixtures/specs/query_forwarding_1.json
index 69395af5..32549ea2 100644
--- a/tests/fixtures/specs/query_forwarding_1.json
+++ b/tests/fixtures/specs/query_forwarding_1.json
@@ -8,7 +8,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"],\"b\":[\"2\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"],\"b\":[\"2\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/query_forwarding_2.json b/tests/fixtures/specs/query_forwarding_2.json
index d84ef222..2bf6afdc 100644
--- a/tests/fixtures/specs/query_forwarding_2.json
+++ b/tests/fixtures/specs/query_forwarding_2.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"],\"b\":[\"2\",\"3\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"],\"b\":[\"2\",\"3\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/query_forwarding_3.json b/tests/fixtures/specs/query_forwarding_3.json
index 1e22d366..0197f0d9 100644
--- a/tests/fixtures/specs/query_forwarding_3.json
+++ b/tests/fixtures/specs/query_forwarding_3.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"]}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/foo\",\"query\":{\"a\":[\"1\"]}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/sequential_1.json b/tests/fixtures/specs/sequential_1.json
index 66f426e3..d85f84a0 100644
--- a/tests/fixtures/specs/sequential_1.json
+++ b/tests/fixtures/specs/sequential_1.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/42\",\"query\":{}}",
+		"body": "{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/42\",\"query\":{}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": ["public, max-age=3600"],
diff --git a/tests/fixtures/specs/timeout.json b/tests/fixtures/specs/timeout.json
index b13403fe..d3f9b90c 100644
--- a/tests/fixtures/specs/timeout.json
+++ b/tests/fixtures/specs/timeout.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "{\"first\":{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.3.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/123\",\"query\":{}}}",
+		"body": "{\"first\":{\"foo\":42,\"headers\":{\"Accept-Encoding\":[\"gzip\"],\"User-Agent\":[\"KrakenD Version 1.4.0\"],\"X-Forwarded-Host\":[\"localhost:8080\"]},\"path\":\"/param_forwarding/123\",\"query\":{}}}",
 		"header": {
 			"content-type": ["application/json; charset=utf-8"],
 			"Cache-Control": [""],
diff --git a/tests/fixtures/specs/xml_2.json b/tests/fixtures/specs/xml_2.json
index 939d4314..a8a5c9e0 100644
--- a/tests/fixtures/specs/xml_2.json
+++ b/tests/fixtures/specs/xml_2.json
@@ -5,7 +5,7 @@
 	},
 	"out": {
 		"status_code": 200,
-		"body": "<doc><foo>42</foo><headers><Accept-Encoding>gzip</Accept-Encoding><Referer>http://127.0.0.1:8081/param_forwarding</Referer><User-Agent>KrakenD Version 1.3.0</User-Agent><X-Forwarded-Host>localhost:8080</X-Forwarded-Host></headers><path>/param_forwarding/</path><query/></doc>",
+		"body": "<doc><foo>42</foo><headers><Accept-Encoding>gzip</Accept-Encoding><Referer>http://127.0.0.1:8081/param_forwarding</Referer><User-Agent>KrakenD Version 1.4.0</User-Agent><X-Forwarded-Host>localhost:8080</X-Forwarded-Host></headers><path>/param_forwarding/</path><query/></doc>",
 		"header": {
 			"content-type": ["application/xml"],
 			"Cache-Control": ["public, max-age=3600"],