refactor: network - harden TCP/IP and unify HTTP clients

tests/Makefile

@@ -0,0 +1,18 @@
+CXX ?= g++
+CXXFLAGS ?= -std=c++20 -O2 -Wall -Wextra
+
+HTTP_TEST := http_test
+
+.PHONY: all check clean
+
+all: $(HTTP_TEST)
+
+$(HTTP_TEST): http_test.cpp
+	$(CXX) $(CXXFLAGS) -I../programs/include \
+		-I../programs/lib/bearssl/inc $< -o $@
+
+check: $(HTTP_TEST)
+	./$(HTTP_TEST)
+
+clean:
+	rm -f $(HTTP_TEST)