diff --git a/.gitmodules b/.gitmodules
index e513ccf..cca944b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -31,3 +31,6 @@
 [submodule "deps/doctest"]
 	path = deps/doctest
 	url = https://github.com/doctest/doctest
+[submodule "deps/dlhttp"]
+	path = deps/dlhttp
+	url = https://github.com/lionkor/dlhttp
diff --git a/deps/CMakeLists.txt b/deps/CMakeLists.txt
index 0c1ba10..ce7183e 100644
--- a/deps/CMakeLists.txt
+++ b/deps/CMakeLists.txt
@@ -2,6 +2,13 @@ include_directories("${PROJECT_SOURCE_DIR}/deps")
 include_directories("${PROJECT_SOURCE_DIR}/deps/commandline")
 
 add_subdirectory("${PROJECT_SOURCE_DIR}/deps/commandline")
-add_subdirectory("${PROJECT_SOURCE_DIR}/deps/fmt")
-add_subdirectory("${PROJECT_SOURCE_DIR}/deps/sol2")
-add_subdirectory("${PROJECT_SOURCE_DIR}/deps/doctest")
+if (NOT TARGET fmt)
+    add_subdirectory("${PROJECT_SOURCE_DIR}/deps/fmt")
+endif()
+if (NOT TARGET sol2)
+    add_subdirectory("${PROJECT_SOURCE_DIR}/deps/sol2")
+endif()
+if (NOT TARGET doctest)
+    add_subdirectory("${PROJECT_SOURCE_DIR}/deps/doctest")
+endif()
+add_subdirectory("${PROJECT_SOURCE_DIR}/deps/dlhttp")
diff --git a/deps/dlhttp b/deps/dlhttp
new file mode 160000
index 0000000..6368e3e
--- /dev/null
+++ b/deps/dlhttp
@@ -0,0 +1 @@
+Subproject commit 6368e3e2364a70555de93fd702f85f2bfb9e3d95