diff --git a/header.go b/header.go
index b6d8ffec92..1b11779d7c 100644
--- a/header.go
+++ b/header.go
@@ -1382,7 +1382,7 @@ func (h *RequestHeader) del(key []byte) {
 }
 
 // setSpecialHeader handles special headers and return true when a header is processed.
-func (h *ResponseHeader) setSpecialHeader(key, value []byte) bool {
+func (h *ResponseHeader) setSpecialHeader(key, value []byte, add bool) bool {
 	if len(key) == 0 {
 		return false
 	}
@@ -1417,6 +1417,9 @@ func (h *ResponseHeader) setSpecialHeader(key, value []byte) bool {
 			return true
 		} else if caseInsensitiveCompare(strSetCookie, key) {
 			var kv *argsKV
+			if !add {
+				h.DelAllCookies()
+			}
 			h.cookies, kv = allocArg(h.cookies)
 			kv.key = getCookieKey(kv.key, value)
 			kv.value = append(kv.value[:0], value...)
@@ -1446,7 +1449,7 @@ func (h *ResponseHeader) setNonSpecial(key, value []byte) {
 }
 
 // setSpecialHeader handles special headers and return true when a header is processed.
-func (h *RequestHeader) setSpecialHeader(key, value []byte) bool {
+func (h *RequestHeader) setSpecialHeader(key, value []byte, add bool) bool {
 	if len(key) == 0 || h.disableSpecialHeader {
 		return false
 	}
@@ -1473,6 +1476,9 @@ func (h *RequestHeader) setSpecialHeader(key, value []byte) bool {
 			return true
 		case caseInsensitiveCompare(strCookie, key):
 			h.collectCookies()
+			if !add {
+				h.DelAllCookies()
+			}
 			h.cookies = parseRequestCookies(h.cookies, value)
 			return true
 		}
@@ -1561,7 +1567,7 @@ func (h *ResponseHeader) AddBytesV(key string, value []byte) {
 // If the header is set as a Trailer (forbidden trailers will not be set, see AddTrailer for more details),
 // it will be sent after the chunked response body.
 func (h *ResponseHeader) AddBytesKV(key, value []byte) {
-	if h.setSpecialHeader(key, value) {
+	if h.setSpecialHeader(key, value, true) {
 		return
 	}
 
@@ -1620,7 +1626,7 @@ func (h *ResponseHeader) SetBytesKV(key, value []byte) {
 // If the header is set as a Trailer (forbidden trailers will not be set, see SetTrailer for more details),
 // it will be sent after the chunked response body.
 func (h *ResponseHeader) SetCanonical(key, value []byte) {
-	if h.setSpecialHeader(key, value) {
+	if h.setSpecialHeader(key, value, false) {
 		return
 	}
 	h.setNonSpecial(key, value)
@@ -1772,7 +1778,7 @@ func (h *RequestHeader) AddBytesV(key string, value []byte) {
 // If the header is set as a Trailer (forbidden trailers will not be set, see AddTrailer for more details),
 // it will be sent after the chunked request body.
 func (h *RequestHeader) AddBytesKV(key, value []byte) {
-	if h.setSpecialHeader(key, value) {
+	if h.setSpecialHeader(key, value, true) {
 		return
 	}
 
@@ -1831,7 +1837,7 @@ func (h *RequestHeader) SetBytesKV(key, value []byte) {
 // If the header is set as a Trailer (forbidden trailers will not be set, see SetTrailer for more details),
 // it will be sent after the chunked request body.
 func (h *RequestHeader) SetCanonical(key, value []byte) {
-	if h.setSpecialHeader(key, value) {
+	if h.setSpecialHeader(key, value, false) {
 		return
 	}
 	h.setNonSpecial(key, value)
diff --git a/header_test.go b/header_test.go
index 37b775b26d..1eedb0dab2 100644
--- a/header_test.go
+++ b/header_test.go
@@ -1643,7 +1643,32 @@ func TestRequestHeaderSetCookie(t *testing.T) {
 	var h RequestHeader
 
 	h.Set("Cookie", "foo=bar; baz=aaa")
+	if string(h.Cookie("foo")) != "bar" {
+		t.Fatalf("Unexpected cookie %q. Expecting %q", h.Cookie("foo"), "bar")
+	}
+	if string(h.Cookie("baz")) != "aaa" {
+		t.Fatalf("Unexpected cookie %q. Expecting %q", h.Cookie("baz"), "aaa")
+	}
+
 	h.Set("cOOkie", "xx=yyy")
+	if len(h.Cookie("foo")) != 0 {
+		t.Fatalf("Unexpected cookie %q. Expecting empty string", h.Cookie("foo"))
+	}
+	if len(h.Cookie("baz")) != 0 {
+		t.Fatalf("Unexpected cookie %q. Expecting empty string", h.Cookie("baz"))
+	}
+	if string(h.Cookie("xx")) != "yyy" {
+		t.Fatalf("unexpected cookie %q. Expecting %q", h.Cookie("xx"), "yyy")
+	}
+}
+
+func TestRequestHeaderAddCookie(t *testing.T) {
+	t.Parallel()
+
+	var h RequestHeader
+
+	h.Add("Cookie", "foo=bar; baz=aaa")
+	h.Add("cOOkie", "xx=yyy")
 
 	if string(h.Cookie("foo")) != "bar" {
 		t.Fatalf("Unexpected cookie %q. Expecting %q", h.Cookie("foo"), "bar")
@@ -1662,8 +1687,44 @@ func TestResponseHeaderSetCookie(t *testing.T) {
 	var h ResponseHeader
 
 	h.Set("set-cookie", "foo=bar; path=/aa/bb; domain=aaa.com")
+
+	var c Cookie
+	c.SetKey("foo")
+	if !h.Cookie(&c) {
+		t.Fatalf("cannot obtain %q cookie", c.Key())
+	}
+	if string(c.Value()) != "bar" {
+		t.Fatalf("unexpected cookie value %q. Expected %q", c.Value(), "bar")
+	}
+	if string(c.Path()) != "/aa/bb" {
+		t.Fatalf("unexpected cookie path %q. Expected %q", c.Path(), "/aa/bb")
+	}
+	if string(c.Domain()) != "aaa.com" {
+		t.Fatalf("unexpected cookie domain %q. Expected %q", c.Domain(), "aaa.com")
+	}
+
 	h.Set(HeaderSetCookie, "aaaaa=bxx")
 
+	if h.Cookie(&c) {
+		t.Fatalf("obtain %q cookie", c.Key())
+	}
+	c.SetKey("aaaaa")
+	if !h.Cookie(&c) {
+		t.Fatalf("cannot obtain %q cookie", c.Key())
+	}
+	if string(c.Value()) != "bxx" {
+		t.Fatalf("unexpected cookie value %q. Expecting %q", c.Value(), "bxx")
+	}
+}
+
+func TestResponseHeaderAddCookie(t *testing.T) {
+	t.Parallel()
+
+	var h ResponseHeader
+
+	h.Add("set-cookie", "foo=bar; path=/aa/bb; domain=aaa.com")
+	h.Add(HeaderSetCookie, "aaaaa=bxx")
+
 	var c Cookie
 	c.SetKey("foo")
 	if !h.Cookie(&c) {