main.cpp

#include "httplib.h"
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <sstream>

static std::string read_file(const std::string& path) {
    std::ifstream file(path);
    std::stringstream ss;
    ss << file.rdbuf();
    return ss.str();
}

int main() {
    httplib::Server svr;

    const std::string landing = read_file("index.html");

    svr.Get("/", [&](const httplib::Request&, httplib::Response& res) {
        res.set_content(landing, "text/html; charset=utf-8");
    });

    svr.Get("/health", [](const httplib::Request&, httplib::Response& res) {
        res.set_content(
            R"({"message":"If you see this, your app is running well!"})",
            "application/json");
    });

    const char* port_env = std::getenv("app_port");
    int port = port_env && *port_env ? std::atoi(port_env) : 8080;

    std::cout << "C++ sample listening on 0.0.0.0:" << port << std::endl;
    svr.listen("0.0.0.0", port);
    return 0;
}