diff --git a/.gitmodules b/.gitmodules
index 80206d4..41c19a4 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -28,3 +28,9 @@
 [submodule "sources/lua-resty-websocket"]
 	path = sources/lua-resty-websocket
 	url = https://github.com/openresty/lua-resty-websocket
+[submodule "sources/lua-resty-http"]
+	path = sources/lua-resty-http
+	url = https://github.com/ledgetech/lua-resty-http
+[submodule "sources/lua-resty-string"]
+	path = sources/lua-resty-string
+	url = https://github.com/openresty/lua-resty-string
diff --git a/build b/build
index aa0eb69..76f6b3c 100755
--- a/build
+++ b/build
@@ -82,7 +82,7 @@ popd
 
 # resty libs that can be installed
 RESTY_LIBS=(
-	lua-resty-{core,lrucache,websocket}
+	lua-resty-{core,lrucache,string,websocket,http}
 )
 
 # install resty libs
diff --git a/sources/cf-zlib b/sources/cf-zlib
index 9253056..872e5fb 160000
--- a/sources/cf-zlib
+++ b/sources/cf-zlib
@@ -1 +1 @@
-Subproject commit 92530568d2c128b4432467b76a3b54d93d6350bd
+Subproject commit 872e5fb3cf88bb281e19a8327b3ea0889cc34773
diff --git a/sources/lua-resty-core b/sources/lua-resty-core
index 67d060b..af09640 160000
--- a/sources/lua-resty-core
+++ b/sources/lua-resty-core
@@ -1 +1 @@
-Subproject commit 67d060b4d681bd8b94465155fa4d770a1a8fb0b3
+Subproject commit af096404fbb7298f2ec1895feb65465d737b3658
diff --git a/sources/lua-resty-http b/sources/lua-resty-http
new file mode 160000
index 0000000..1833103
--- /dev/null
+++ b/sources/lua-resty-http
@@ -0,0 +1 @@
+Subproject commit 183310324026120ab7eaf5dd82b9be90ae63aadf
diff --git a/sources/lua-resty-lrucache b/sources/lua-resty-lrucache
index 1e044bf..3ff6300 160000
--- a/sources/lua-resty-lrucache
+++ b/sources/lua-resty-lrucache
@@ -1 +1 @@
-Subproject commit 1e044bff341655507f86c77bab8758ede2658d49
+Subproject commit 3ff6300e68b73ba20e909c7d16bd839aef2e5a4b
diff --git a/sources/lua-resty-string b/sources/lua-resty-string
new file mode 160000
index 0000000..c6b4348
--- /dev/null
+++ b/sources/lua-resty-string
@@ -0,0 +1 @@
+Subproject commit c6b4348f53607044d16ec5fdc3d06fd30df487d8
diff --git a/sources/luajit2 b/sources/luajit2
index 33d6b04..24d0c66 160000
--- a/sources/luajit2
+++ b/sources/luajit2
@@ -1 +1 @@
-Subproject commit 33d6b04681d2f079a6d013988a426a841c52e29e
+Subproject commit 24d0c668883b65b13c8b5357805c6d4113e0ba6a
diff --git a/sources/modules/lua-nginx-module b/sources/modules/lua-nginx-module
index e1ff117..950b1fb 160000
--- a/sources/modules/lua-nginx-module
+++ b/sources/modules/lua-nginx-module
@@ -1 +1 @@
-Subproject commit e1ff117183c25a20a35c59c536a882820296a5cf
+Subproject commit 950b1fb2010c8847a1e0bc7f079741ec47a08f17
diff --git a/sources/modules/nginx-module-vts b/sources/modules/nginx-module-vts
index 724b34d..88a3870 160000
--- a/sources/modules/nginx-module-vts
+++ b/sources/modules/nginx-module-vts
@@ -1 +1 @@
-Subproject commit 724b34d7f1eff083860e3ac613a2c1d66a238dfd
+Subproject commit 88a3870e5a571b327da65a2eeb8176b076a462df
diff --git a/sources/nginx b/sources/nginx
index 51857ce..29aec57 160000
--- a/sources/nginx
+++ b/sources/nginx
@@ -1 +1 @@
-Subproject commit 51857ce40400b48bc8900b9e3930cf7474fa0c41
+Subproject commit 29aec5720fdfc74dca8d99d5cf6dc0fcb4e4ce2f