带有参数和返回状态代码的HTTP POST

Question

我正在尝试向使用以下内容的Web API发送HTTP发布请求：应用程序/ JSON，并具有某些参数：in = body，required = true，type = string和name = name。但是我不知道如何发送数据和使用参数发出请求。

#define SA struct sockaddr
#define MAXLINE 4096
#define MAXSUB  200


#define LISTENQ 1024

extern int h_errno;

ssize_t process_http(int sockfd, char *host, char *page, char *poststr){
char sendline[MAXLINE + 1], recvline[MAXLINE + 1];
ssize_t n;
snprintf(sendline, MAXSUB,
     "POST %s HTTP/1.0\r\n"
     "Host: %s\r\n"
     "Content-type: application/json\r\n"
     "Content-length: %d\r\n\r\n"
     "%s", page, host, strlen(poststr), poststr);
write(sockfd, sendline, strlen(sendline));
while ((n = read(sockfd, recvline, MAXLINE)) > 0) {
    recvline[n] = '\0';
    printf("%s", recvline);
}
return n;
}

int main(void){
int sockfd;
struct sockaddr_in servaddr;

char **pptr;
//********** You can change. Puy any values here *******
char *hname = "some_api_.net";
char *page = "/path";
char *poststr = "in=body&required=true&type=string&name=name\r\n";
//*******************************************************

char str[50];
struct hostent *hptr;
if ((hptr = gethostbyname(hname)) == NULL) {
    fprintf(stderr, " gethostbyname error for host: %s: %s",
        hname, hstrerror(h_errno));
    exit(1);
}
printf("hostname: %s\n", hptr->h_name);
if (hptr->h_addrtype == AF_INET
    && (pptr = hptr->h_addr_list) != NULL) {
    printf("address: %s\n",
           inet_ntop(hptr->h_addrtype, *pptr, str,
             sizeof(str)));
} else {
    fprintf(stderr, "Error call inet_ntop \n");
}

sockfd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(80);
inet_pton(AF_INET, str, &servaddr.sin_addr);

connect(sockfd, (SA *) & servaddr, sizeof(servaddr));
process_http(sockfd, hname, page, poststr);
close(sockfd);
exit(0);
}

我希望收到状态码并进行处理。