Added cpp-httplib as libcurl replacement

src/3rdparty/cpp-httplib/example/benchmark.cc

@@ -0,0 +1,33 @@
+#include <httplib.h>
+#include <chrono>
+#include <iostream>
+
+using namespace std;
+
+struct StopWatch {
+  StopWatch(const string& label) : label_(label) {
+    start_ = chrono::system_clock::now();
+  }
+  ~StopWatch() {
+    auto end = chrono::system_clock::now();
+    auto diff = end - start_;
+    auto count = chrono::duration_cast<chrono::milliseconds>(diff).count();
+    cout << label_ << ": " << count << " millisec." << endl;
+  }
+  string label_;
+  chrono::system_clock::time_point start_;
+};
+
+int main(int argc, char* argv[]) {
+  string body(1024 * 5, 'a');
+
+  httplib::Client cli("httpbin.org", 80);
+
+  for (int i = 0; i < 3; i++) {
+    StopWatch sw(to_string(i).c_str());
+    auto res = cli.post("/post", body, "application/octet-stream");
+    assert(res->status == 200);
+  }
+
+  return 0;
+}