C语言：socket简单模拟http请求

#include <stdio.h>
#include <stdlib.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <netdb.h>

#include <sys/types.h>

#include <string.h>

char *http_header = "GET / HTTP/1.1\r\n"
                                        "Host: www.idoushuo.com\r\n"
                                        "Connection: keep-alive\r\ni"
                                        "Accept: */*\r\n"
                                        "Connection: close\r\n"
                                        "\r\n";

char *hostname = "www.idoushuo.com";

int main(){
        struct sockaddr_in addr;
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        addr.sin_port = htons(80);

        struct hostent *hp;
        hp = gethostbyname(hostname);
        memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);

        int sockfd = socket(AF_INET, SOCK_STREAM, 0);
        int ret = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));

        //send
        send(sockfd, http_header, strlen(http_header), 0);
        //recv
        ssize_t length = 0;
        char buf[101];
        memset(buf, 0, sizeof(buf));
        char *response = calloc(1, sizeof(char));
        do{
                length = recv(sockfd, buf, 100, 0);
                if(length){
                        //leak mem
                        char *pp = realloc(response, strlen(response)+length+1);
                        if(!pp){
                                break;
                        }
                        response = pp;
                        memcpy(response + strlen(response), buf, length);
                        memset(buf, 0x0, sizeof(buf));
                }
        }while(length != 0);

        printf("%s\n", response);

        free(response);
}