C 发送http request

//remember free response
char* sendTcpRequest(char* request, int port, char* addr) {
if(request == NULL)
return EMPTY_STR;

WSADATA wsa;
if(WSAStartup(MAKEWORD(2,2), &wsa) != 0) {
return EMPTY_STR;
}

int sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sclient == INVALID_SOCKET) {
printf("invalid socket !");
return EMPTY_STR;
}

struct sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(port);
serAddr.sin_addr.S_un.S_addr = inet_addr(addr);
int slen = sizeof(serAddr);

if (connect(sclient, (struct sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR) {
printf("connect error !");
closesocket(sclient);
return EMPTY_STR;
}

char recData[RECV_BUFLEN];
int ret = 0;
int i = 0;
while(i < REQ_COUNT) {
send(sclient, request, strlen(request), 0);
ret = recv(sclient, recData, RECV_BUFLEN, 0);
if(ret <= 0) {
i ++;
continue;
}

recData[ret] = 0x00;
printf("===========================  Response  ==========================\n");
puts(recData);

if(strstr(recData, "200 OK") != NULL) {
//receive more info from bridge
memset(recData,'\0', RECV_BUFLEN);
ret = recv(sclient, recData, RECV_BUFLEN, 0);
if(ret > 0) {
printf("===========================  Response  ==========================\n");
puts(recData);
}
break;
}
}
closesocket(sclient);
WSACleanup();

if(i >= REQ_COUNT) {
printf("after %d times request, server still don't respond!\n", REQ_COUNT);
return EMPTY_STR;
} else {
char* response = (char*) malloc(sizeof(char) * strlen(recData));
strcpy(response, recData);

return response;
}
}