Izviniaus's questions

我在套接字上发出了一个 http GET 请求，但遇到了一个问题：我怎样才能提前知道来自服务器的响应的长度以及是否有必要？这是请求（响应）代码：

 bool SendHttpGETRequest(LPCSTR PTFWP, LPCSTR site)
{
    string get = "GET "s + PTFWP + " HTTP/1.1\r\nHost: " + site + "\r\nConnection: close\r\n\r\n";

    if (send(servSock, get.c_str(), get.size(), 0) <= 0) {
        result = "Error\0";
        return false;
    }
    
    char* resHeaders = new char[310];

    if (recv(servSock, resHeaders, 310, 0) < 0) {
        result = "Error!\0";
        return false;
    }
    result = resHeaders;

    result = result.substr(result.find("Content-Length:") + 15);
    result = result.substr(0, result.find_first_of("\r\n"));

    int bufSize = stoi(result);
    delete resHeaders;
    resHeaders = new char[bufSize + 1];

    int readOfBytes = 0;
    int AllSize = 0;
    result = "";
    while (((readOfBytes = recv(servSock, resHeaders, bufSize, 0)) > 0) && ((AllSize+=readOfBytes)<= bufSize)) {
        result += resHeaders;
    }
    result[bufSize] = '\0';
    if ((readOfBytes < 0) && result.empty())
        return false;
    return true;
}