C++ asio写入成功，但未发送信息

我在创建发送请求的客户端程序时遇到问题。请求正在使用保持活动状态的TCP HTTP连接。当连接关闭时（由于超时或最大值被命中），如果没有可用的连接，我会尝试启动一个新连接，然后重新发送请求。连接工作正常，但是，当我尝试发送写入时，没有发送任何内容（根据Wireshark），但我的写入错误代码成功。接收服务器也不接收任何信息。以下是我的代码的主要部分：

void request_handler::send_1(std::vector<std::string> *bid_vector, std::string request_path, boost::mutex *bids_mutex)
{
    try
    {
        boost::asio::streambuf request;
        std::ostream request_stream(&request);
        std::string reply_information;
        request_stream << "GET /tests HTTP/1.1\r\n";
        request_stream << "Host: 10.1.10.160\r\n";
        request_stream << "Accept: */*\r\n";
        request_stream << "Connection: keep-alive\r\n\r\n";

        server1_mutex_.lock();
        if(server1_available_map_.size() == 0)
        {
            server1_mutex_.unlock();

            persistent_connection *new_connection = new persistent_connection("10.1.10.160","80");
            if(new_connection->send(request, reply_information))
            {
                server1_mutex_.lock();
                    server1_available_map_[new_connection->get_id()] = new_connection;
                server1_mutex_.unlock();
            }
        }
        else
        {
                persistent_connection *current_connection = (*(server1_available_map_.begin())).second;
                server1_available_map_.erase(current_connection->get_id());
            server1_mutex_.unlock();

            int retry_counter = 20;
            while(!current_connection->query_rtb(request, reply_information) && --retry_counter != 0)
            {
                delete current_connection;

                server1_mutex_.lock();
                if(server1_available_map_.size() == 0)
                {
                    server1_mutex_.unlock();
                    current_connection = new persistent_connection("10.1.10.160","80");
                }
                else
                {
                        current_connection = (*(server1_available_map_.begin())).second;
                        server1_available_map_.erase(current_connection->get_id());
                    server1_mutex_.unlock();
                }
            }
            //Could not connect to 20 connections
            if(retry_counter == 0)
            {
                Log::fatal("Could not connect in 20 tries");
                delete current_connection;
                return;
            }

            server1_mutex_.lock();
                server1_available_map_[current_connection->get_id()] = current_connection;
            server1_mutex_.unlock();
        }    
        bids_mutex->lock();
            bid_vector->push_back(reply_information);
        bids_mutex->unlock();    
    }
    catch(boost::thread_interrupted& e)
    {
        std::cout << "before cancel 1" << std::endl;
        return;
    }
    catch(...)
    {
        std::cout << "blah blah blah" << std::endl;
    }
}

这表明第一个连接得到了文件的结尾（另一端的服务器关闭了连接）。第二个连接连接良好（连接处理程序消息），查询在第二个连接（不同id）中执行，写入显然成功，程序挂起读取（因为没有要读取的内容）

有人知道为什么会这样吗？我好像做错什么了吗

---

谢谢

看起来您正在向多个写调用传递相同的boost:：asio:：streambuf

boost::asio::write(socket_, request_information, write_ec);

---

缓冲区的内容被第一次调用boost:：asio:：write消耗。这有效地清空了缓冲区，因此没有任何东西可以发送。如果要使用同一缓冲区进行多次写入，请传递常量字符串。

非常感谢，就是这样，我不知道从streambuf读取是破坏性的。

DOING QUERY in 69a8f0ab-2a06-45b4-be26-37aea6d93ff2
Before write
Success
Before read
End of file
Read error: End of file
Connect handler
DOING QUERY in 4eacaa96-1040-4878-8bf5-c29b87fa1232
Before write
Success
Before read

boost::asio::write(socket_, request_information, write_ec);