基于libcurl的GET与POST(HTTP1.1)
Posted liuzhenbo
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#include <stdio.h> #include <curl/curl.h> bool getUrl(char *filename) CURL *curl; CURLcode res; FILE *fp; if ((fp = fopen(filename, "w")) == NULL) // 返回结果用文件存储 return false; struct curl_slist *headers = NULL; // headers = curl_slist_append(headers, "Accept: Agent-007"); curl = curl_easy_init(); // 初始化 if (curl) //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080");// 代理 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);// 改协议头 curl_easy_setopt(curl, CURLOPT_URL,"http://www.nengyouyun.cn/user/getAppversionnew2?apptype=H5C899DDC"); // curl_easy_setopt(curl, CURLOPT_URL,"http://localhost/"); curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //将返回的html主体数据输出到fp指向的文件 curl_easy_setopt(curl, CURLOPT_HEADERDATA, fp); //将返回的http头输出到fp指向的文件 res = curl_easy_perform(curl); // 执行 if (res != 0) curl_slist_free_all(headers); curl_easy_cleanup(curl); fclose(fp); return true; bool postUrl(char *filename) CURL *curl; CURLcode res; FILE *fp; struct curl_httppost *formpost = NULL; struct curl_httppost *lastptr = NULL; if ((fp = fopen(filename, "w")) == NULL) return false; curl = curl_easy_init(); if (curl) // curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "cookie.txt"); // 指定cookie文件 curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "image",CURLFORM_COPYCONTENTS,"1.jpg",CURLFORM_END); // curl_easy_setopt(curl,CURLOPT_HTTPPOST,formpost); // POST -liuzhenbo //curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "&logintype=uid&u=xieyan&psw=xxx86"); // 指定post内容 //curl_easy_setopt(curl, CURLOPT_PROXY, "10.99.60.201:8080"); curl_easy_setopt(curl, CURLOPT_URL, "http://www.nengyouyun.cn/user/getAppversionnew2?apptype=H5C899DDC"); // 指定url curl_easy_setopt(curl,CURLOPT_HTTPPOST,formpost); // POST -liuzhenbo curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp); //HTTP主体数据 -liuzhenbo curl_easy_setopt(curl, CURLOPT_HEADERDATA, fp); //将返回的http头输出到fp指向的文件 res = curl_easy_perform(curl); curl_easy_cleanup(curl); curl_formfree(formpost); fclose(fp); return true; int main(void) getUrl("get"); postUrl("post");
GET方式接收到服务器端发来的http头:
HTTP/1.1 200 Server: nginx/1.10.0 (Ubuntu) Date: Mon, 17 Jun 2019 11:34:45 GMT Content-Type: application/json;charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive X-Application-Context: cloud-gateway:7001
POST方式接收到服务器发来的http头:
HTTP/1.1 100 Continue HTTP/1.1 200 Server: nginx/1.10.0 (Ubuntu) Date: Mon, 17 Jun 2019 11:34:45 GMT Content-Type: application/json;charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive X-Application-Context: cloud-gateway:7001
注:使用HTTP/1.1协议的curl,当要POST的数据大于1024字节的时候, curl并不会直接就发起POST请求, 而是会分为俩步。(我认为主要是为了节省资源)
流程如下:
(1)发送一个请求, 包含一个Expect:100-continue, 询问Server使用愿意接受数据
(2)接收到Server返回的100-continue应答以后, 把数据POST给Server
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