First commit.

test/pch.h

@@ -0,0 +1,18 @@
+#pragma once
+
+// Diagnostic type used to report calculated type T in an error message.
+template <typename T> class TypeDisplay;
+
+
+#include <string>
+#include <memory>
+#include <boost/asio/ip/tcp.hpp>
+#include <mutex>
+#include <string>
+#include <vector>
+#include <string_view>
+#include <stdexcept>
+#include <sstream>
+#include <cstdlib>
+#include <boost/asio/ip/tcp.hpp>
+#include <boost/beast/http.hpp>