网络编程 单纯http客户端，服务器端

http客户端：

#include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <errno.h> #include <netdb.h> #include <string.h> #include <unistd.h>   int main(int argc, char* argv[]){    int err;   int sock;   char buf[32];   char* deststr;   addrinfo hints, *res0, *res;   if(argc != 2){return 1;}    deststr = argv[1];    memset(&hints, 0, sizeof(hints));   hints.ai_socktype = sock_stream;   hints.ai_family = pf_unspec;   if((err = getaddrinfo(deststr, "http", &hints, &res0)) != 0){     printf("error %d:%sn", err, gai_strerror(err));     return 1;   }   for(res = res0; res != null; res = res->ai_next){     printf("%dn", res->ai_family);     sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);     if(sock < 0){continue;}     if(connect(sock, res->ai_addr, res->ai_addrlen) != 0){       close(sock);       continue;     }     break;   }    freeaddrinfo(res0);    if(res == null){     printf("failedn");     return 1;   }    snprintf(buf, sizeof(buf), "get / http/1.0rnrn");    int n = write(sock, buf, (int)strlen(buf));    while(n > 0){     n = read(sock, buf, sizeof(buf));     write(fileno(stdout), buf, n);   }    close(sock);   return 0; } 

发送端的执行方式：

./a.out www.baidu.com

http服务器端

#include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <errno.h> #include <netdb.h> #include <string.h> #include <unistd.h>  int main(){   int sock0;   sockaddr_in client;   socklen_t len;   int sock;   int yes = 1;   addrinfo *res, hints;   int err;   char buf[2048];   int n;   char inbuf[2048];    hints.ai_family = af_inet;   hints.ai_flags = ai_passive;   hints.ai_socktype = sock_stream;    err = getaddrinfo(null, "12345", &hints, &res);   if(err != 0){     printf("getaddrinfo %sn", gai_strerror(err));     return 1;   }    sock0 = socket(res->ai_family, res->ai_socktype, 0);    setsockopt(sock0, sol_socket, so_reuseaddr, (const char*)&yes, sizeof(yes));   bind(sock0, res->ai_addr, res->ai_addrlen);   listen(sock0, 5);    snprintf(buf, sizeof(buf),        "http/1.0 200 okrn"        "content-length: 20rn"        "content-type:text/htmlrn"        "rn"        "hellorn");   while(1){     len = sizeof(client);     sock = accept(sock0, (sockaddr*)&client, &len);     n = read(sock, inbuf, sizeof(inbuf));     write(fileno(stdout), inbuf, n);     write(sock, buf, (int)strlen(buf));     close(sock);   }   close(sock0);   return 0; } 

测试方式：

在浏览器里输入：https://127.0.0.1:12345 或者输入：https://localhost:12345