crequests是根据Python requests库的功能仿写的一个C++ HTTP请求库，使用C++11编写，目前支持GET/POST/HEAD方法，支持HTTP/HTTPS访问，但暂时只能在Linux上使用。
访问https站点需要openssl，所以本项目中已经引入了openssl的头文件和动态库，可直接使用，不需要额外安装，但目前只适配linux，windows后面会跟上（windows上真的好麻烦）。
crequests目前支持的点有：
- 使用了openssl支持https访问
- 可以使用GET、POST、HEAD方法
- 支持自定义请求头
- POST可以添加请求正文，提交表单
- 可以查看响应头的各项参数
- 支持chunk编码控制长度和Content-length控制长度
- 支持设置超时时间，超时则返回一个状态吗为-1的response对象
#include <map>
#include <cstdio>
#include "crequests.h"
int main() {
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string url = "https://www.baidu.com";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
auto r = crequests::get(url, headers);
printf("%d\n", r.status_code_);
printf("%s\n", r.get_body().c_str());
return 0;
}输出：
TCPConnect success!
SSLConnect success!
200
<!DOCTYPE html>
<!--STATUS OK-->
...
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
...
</body>
</html>#include <map>
#include <cstdio>
#include "crequests.h"
int main() {
// 这里换成自己的cookie
std::string cookie = "XXXXX*****XJHJSHJHSBJFBJHBSFJHB";
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string url = "https://www.zhihu.com";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
headers["cookie"] = cookie;
// 设置超时时间为10s
auto r = crequests::get(url, headers, 3);
printf("%d\n", r.status_code_);
printf("%s\n", r.get_body().c_str());
return 0;
}输出：
TCPConnect success!
SSLConnect success!
200
<!DOCTYPE html>
<!--STATUS OK-->
...
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
...
</body>
</html>#include <memory>
#include <map>
#include <cstdio>
#include "crequests.h"
int main() {
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string data = "is_pad=1&username=2195XXXX&password=XXXXXX";
std::string url = "http://192.0.0.6/cgi-bin/do_login";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
auto r = crequests::post(url, headers, data);
printf("%d\n", r.status_code_);
printf("%s\n", r.get_body().c_str());
return 0;
}输出：
TCPConnect success!
200
password_error#include <map>
#include <cstdio>
#include "crequests.h"
int main() {
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string url = "https://www.baidu.com";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
// 设置超时时间为10s
auto r = crequests::head(url, headers, 3);
printf("%d\n", r.status_code_);
printf("%s\n", r.get_body().c_str());
return 0;
}输出：
TCPConnect success!
SSLConnect success!
200#include <map>
#include <cstdio>
#include <fstream>
#include "crequests.h"
int main() {
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1570721042152&di=60e08fccf7e7164987a4ff62e43bcfd5&imgtype=0&src=http%3A%2F%2Fi0.hdslb.com%2Fbfs%2Farticle%2F3c2753503ae4955cd4fd3ae1824bac7d15320532.jpg";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
auto r = crequests::get(url, headers);
printf("%d\n", r.status_code_);
std::ofstream img("jth.jpg");
img << r.get_body();
img.close();
return 0;
}输出：
TCPConnect success!
SSLConnect success!
200
超时会退出程序，使用select和信号机制检测超时
#include <map>
#include <cstdio>
#include "crequests.h"
int main() {
std::map<std::string, std::string> headers;
headers["Connection"] = "keep-alive";
std::string url = "https://www.badu.com";
headers.insert(std::make_pair("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36"));
// 设置超时时间为10s
auto r = crequests::get(url, headers, 10);
printf("%d\n", r.status_code_);
printf("%s\n", r.get_body().c_str());
return 0;
}输出：
TCPConnect timeout!
-1
ERROR如果是网络连接失败则：
Can't connect the DNS server, please check your url and network!(14)Email: zoujiakun@zju.edu.cn