c++ http操作接口

很简单的使用libcurl来操作http与服务器来通讯，包含http与https，对外只开放

#include "request.h"
#include "response.h"
#include "url.h"

三个头文件，简单易用，使用的实例如下：
void test_get()
{
Request request("http://httpbin.org/ip");
Response response = request.Perform();

   printf("---------------------------------------------\n");
   printf("%s\n", to_string(response.status()));
   printf("---------------------------------------------\n");
   if (response.status() == Status::SUCCESS
       && response.http_status_code() == http::StatusCode::HTTP_200_OK) // equal to response.ok()
   {
       // Header
       printf("------ Headers -------------------------------\n");
       auto& headers = response.headers();
       for (auto& header : headers) {
           printf("%s: %s\n", header.first.c_str(), header.second.c_str());
       }
       // Data
       printf("------ Body ----------------------------------\n");
       printf("%s\n", response.data().c_str());
       printf("---------------------------------------------\n");
   }
   printf("\n\n");
}

void test_url()
{
   Url url("https://api.icrystal.top/util/random");
   url.SetParam("min", "1");
   url.SetParam("max", "100");
   url.SetParam("count", "20");
   printf("GET: %s\n", url.ToString().c_str());

   Request request(url.ToString());
   request.set_verify_ssl(false);
   auto response = request.Perform();

   if (response.ok()) {
       // Header
       printf("------ Headers -------------------------------\n");
       for (auto& header : response.headers()) {
           printf("%s: %s\n", header.first.c_str(), header.second.c_str());
       }
       // Data
       printf("------ Body ----------------------------------\n");
       printf("%s\n", response.data().c_str());
       printf("---------------------------------------------\n");
   }
   else {
       printf("Request Error: %s %s\n", to_string(response.status()), http::to_string(response.http_status_code()));
   }
}
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