diff --git a/.gitmodules b/.gitmodules
index 86bacf7..f1adb72 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,8 +1,8 @@
 [submodule "picoev/src"]
 	path = picoev/src
 	url = https://github.com/S-YOU/picoev
-	branch = v0.0.1
+	branch = dev
 [submodule "picohttpparser/src"]
 	path = picohttpparser/src
 	url = https://github.com/S-YOU/picohttpparser
-	branch = v0.0.1
+	branch = dev
diff --git a/main.v b/main.v
index 04e6d78..9672498 100644
--- a/main.v
+++ b/main.v
@@ -22,10 +22,10 @@ fn hello_response() string {
 pub fn callback(req hp.Request, res mut hp.Response) {
 	if hp.cmpn(req.method, 'GET ', 4) {
 		if hp.cmp(req.path, '/t') {
-			res.http_ok().header_server().header_date().plain().body(hello_response())
+			res.http_ok_plain(hello_response())
 		}
 		else if hp.cmp(req.path, '/j') {
-			res.http_ok().header_server().header_date().json().body(json_response())
+			res.http_ok_json(json_response())
 		}
 		else {
 			res.http_404()
diff --git a/picohttpparser/response.v b/picohttpparser/response.v
index 2540fb7..7b0f8bb 100644
--- a/picohttpparser/response.v
+++ b/picohttpparser/response.v
@@ -94,3 +94,31 @@ pub fn (r mut Response) end() int {
 	}
 	return n
 }
+
+[inline]
+pub fn (r mut Response) http_ok_plain(s string) &Response {
+	mut buf := r.buf
+	cpy_str(buf, "HTTP/1.1 200 OK\r\nServer: V\r\nDate: ")
+	cpy(buf + 34, r.date, 29)
+	cpy_str(buf + 63, "\r\nContent-Type: text/plain\r\nContent-Length: ")
+	buf += 107
+	buf += C.u64toa(buf, s.len)
+	buf += cpy_str(buf, "\r\n\r\n")
+	buf += cpy_str(buf, s)
+	r.buf = buf
+	return r
+}
+
+[inline]
+pub fn (r mut Response) http_ok_json(s string) &Response {
+	mut buf := r.buf
+	cpy_str(buf, "HTTP/1.1 200 OK\r\nServer: V\r\nDate: ")
+	cpy(buf + 34, r.date, 29)
+	cpy_str(buf + 63, "\r\nContent-Type: application/json\r\nContent-Length: ")
+	buf += 113
+	buf += C.u64toa(buf, s.len)
+	buf += cpy_str(buf, "\r\n\r\n")
+	buf += cpy_str(buf, s)
+	r.buf = buf
+	return r
+}