Add HTTP support and update checking

code/cpp-httplib-0.19.0/example/server_and_client.cc

@@ -0,0 +1,90 @@
+//
+//  server_and_client.cc
+//
+//  Copyright (c) 2025 Yuji Hirose. All rights reserved.
+//  MIT License
+//
+
+#include <httplib.h>
+#include <iostream>
+#include <string>
+
+using namespace httplib;
+
+std::string dump_headers(const Headers &headers) {
+  std::string s;
+  char buf[BUFSIZ];
+
+  for (auto it = headers.begin(); it != headers.end(); ++it) {
+    const auto &x = *it;
+    snprintf(buf, sizeof(buf), "%s: %s\n", x.first.c_str(), x.second.c_str());
+    s += buf;
+  }
+
+  return s;
+}
+
+void logger(const Request &req, const Response &res) {
+  std::string s;
+  char buf[BUFSIZ];
+
+  s += "================================\n";
+
+  snprintf(buf, sizeof(buf), "%s %s %s", req.method.c_str(),
+           req.version.c_str(), req.path.c_str());
+  s += buf;
+
+  std::string query;
+  for (auto it = req.params.begin(); it != req.params.end(); ++it) {
+    const auto &x = *it;
+    snprintf(buf, sizeof(buf), "%c%s=%s",
+             (it == req.params.begin()) ? '?' : '&', x.first.c_str(),
+             x.second.c_str());
+    query += buf;
+  }
+  snprintf(buf, sizeof(buf), "%s\n", query.c_str());
+  s += buf;
+
+  s += dump_headers(req.headers);
+
+  s += "--------------------------------\n";
+
+  snprintf(buf, sizeof(buf), "%d %s\n", res.status, res.version.c_str());
+  s += buf;
+  s += dump_headers(res.headers);
+  s += "\n";
+
+  if (!res.body.empty()) { s += res.body; }
+
+  s += "\n";
+
+  std::cout << s;
+}
+
+int main(void) {
+  // Server
+  Server svr;
+  svr.set_logger(logger);
+
+  svr.Post("/post", [&](const Request & /*req*/, Response &res) {
+    res.set_content("POST", "text/plain");
+  });
+
+  auto th = std::thread([&]() { svr.listen("localhost", 8080); });
+
+  auto se = detail::scope_exit([&] {
+    svr.stop();
+    th.join();
+  });
+
+  svr.wait_until_ready();
+
+  // Client
+  Client cli{"localhost", 8080};
+
+  std::string body = R"({"hello": "world"})";
+
+  auto res = cli.Post("/post", body, "application/json");
+  std::cout << "--------------------------------" << std::endl;
+  std::cout << to_string(res.error()) << std::endl;
+}