c++实现http客户端和服务端的开源库以及Base64加密密码

cpp-httplib的链接地址：
https://github.com/yhirose/cpp-httplib/blob/master/example/benchmark.cc
此http库使用简单，只需要包含httplib.h头文件就可以使用，工程引入十分方便。例子如下：
client.cpp

#include <httplib.h>
#include <iostream>

using namespace std;

int main(void) {
  httplib::Client cli("localhost", 8080);
  httplib::Params pm;
  pm.insert(std::make_pair("userMrn", "sunxiang"));
  pm.insert(std::make_pair("password", "123456"));
  auto res = cli.Post("/services/usermanage/v1/loginUser", pm);
  if (res) {
    cout << res->status << endl;
    cout << res->get_header_value("Content-Type") << endl;
    cout << res->body << endl;
  }

  return 0;
}

server.cpp

//
//  sample.cc
//
//  Copyright (c) 2019 Yuji Hirose. All rights reserved.
//  MIT License
//

#include <chrono>
#include <cstdio>
#include <httplib.h>

#define SERVER_CERT_FILE "./cert.pem"
#define SERVER_PRIVATE_KEY_FILE "./key.pem"

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;
}

std::string log(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";

  return s;
}

int main(void) {
#ifdef CPPHTTPLIB_OPENSSL_SUPPORT
  SSLServer svr(SERVER_CERT_FILE, SERVER_PRIVATE_KEY_FILE);
#else
  Server svr;
#endif

  if (!svr.is_valid()) {
    printf("server has an error...\n");
    return -1;
  }

  svr.Get("/", [=](const Request & /*req*/, Response &res) {
    res.set_redirect("/hi");
  });

  svr.Get("/hi", [](const Request & /*req*/, Response &res) {
    res.set_content("Hello World!\n", "text/plain");
  });

  svr.Get("/slow", [](const Request & /*req*/, Response &res) {
    std::this_thread::sleep_for(std::chrono::seconds(2));
    res.set_content("Slow...\n", "text/plain");
  });

  svr.Get("/dump", [](const Request &req, Response &res) {
    res.set_content(dump_headers(req.headers), "text/plain");
  });

  svr.Get("/stop",
          [&](const Request & /*req*/, Response & /*res*/) { svr.stop(); });

  svr.set_error_handler([](const Request & /*req*/, Response &res) {
    const char *fmt = "<p>Error Status: <span style='color:red;'>%d</span></p>";
    char buf[BUFSIZ];
    snprintf(buf, sizeof(buf), fmt, res.status);
    res.set_content(buf, "text/html");
  });

  svr.set_logger([](const Request &req, const Response &res) {
    printf("%s", log(req, res).c_str());
  });

  svr.listen("localhost", 8080);

  return 0;
}

Base64库的下载地址：
https://download.csdn.net/download/qq_23350817/12548393
此库是加密/解密库，使用起来非常方便，直接调用b64_encode()和b64_decode()就可以对数据进行加密/解密。

Base64用法例子：

#include <b64.h>
#include <string>
#include <vector>
#include <iostream>

int main()
{
    std::string password = "123456";
    std::vector<unsigned char> chs(password.begin(), password.end());
	
    std::cout << b64_encode(chs.data(), chs.size());

    while(1);
    return 0;
}