使用boost.asio将POST请求发送到REST API服务器时出错

Question

我正在尝试使用boost.asio（可能还有boost.beast）向包含JavaScript的rest api发送一个包含JSON数据的POST请求。当我使用Postman时，api处理POST请求并将其成功保存到mysql数据库中，但是当我尝试使用c++代码发送该请求时，服务器崩溃并返回{{1 }}在c ++端，Exception: read_until: End of file在服务器端。这是我用来发送请求的C ++代码...

Error: ER_PARSE_ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?' at line 1

}

下面是服务器代码的一部分，假定该代码可以处理发布请求并将其保存到mysql

#include <iostream>
#include <istream>
#include <ostream>
#include <string>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;
using namespace std;

int main(int argc, char* argv[])
{
    cout << "main -start" << endl;
    try
    {
    boost::asio::io_service io_service;
    string ipAddress = argv[1]; //"localhost" for loop back or ip address otherwise, i.e.- www.boost.org;       
    string portNum = argv[2]; //"8000" for instance;
    string hostAddress;
    if (portNum.compare("80") != 0) // add the ":" only if the port number is not 80 (proprietary port number).
    {
         hostAddress = ipAddress + ":" + portNum;
    }
    else 
    { 
        hostAddress = ipAddress;
    }
    string wordToQuery = "";//this will be used for entry indexing
    string queryStr = argv[3]; //"/api/v1/similar?word=" + wordToQuery;
    string json = argv[4]; //json text

    // Get a list of endpoints corresponding to the server name.
    tcp::resolver resolver(io_service);
    tcp::resolver::query query(ipAddress, portNum);
    tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);

    // Try each endpoint until we successfully establish a connection.
    tcp::socket socket(io_service);
    boost::asio::connect(socket, endpoint_iterator);

    boost::asio::streambuf request;
    std::ostream request_stream(&request);
    request_stream << "POST " << queryStr << " HTTP/1.1\r\n";  // note that you can change it if you wish to HTTP/1.0
    request_stream << "Host: " << hostAddress << "\r\n";
    request_stream << "User-Agent: C/1.0";
    request_stream << "Content-Type: application/json; charset=utf-8 \r\n";
    request_stream << "Accept: */*\r\n";
    request_stream << "Content-Length: " << json.length() << "\r\n"; 
    request_stream << "Connection: close\r\n\r\n";
    request_stream << json;

    // Send the request.
    boost::asio::write(socket, request);

    boost::asio::streambuf response;
    boost::asio::read_until(socket, response, "\r\n");

    // Check that response is OK.
    std::istream response_stream(&response);
    std::string http_version;
    response_stream >> http_version;
    unsigned int status_code;
    response_stream >> status_code;
    std::string status_message;
    std::getline(response_stream, status_message);
    if (!response_stream || http_version.substr(0, 5) != "HTTP/")
    {
        std::cout << "Invalid response\n";
        return 1;
    }
    if (status_code != 200)
    {
        std::cout << "Response returned with status code " << status_code << "\n";
        return 1;
    }

    // Read the response headers, which are terminated by a blank line.
    boost::asio::read_until(socket, response, "\r\n\r\n");

    // Process the response headers.
    std::string header;
    while (std::getline(response_stream, header) && header != "\r")
    {
        std::cout << header << "\n";
    }

    std::cout << "\n";

    // Write whatever content we already have to output.
    if (response.size() > 0)
    {
        std::cout << &response;
    }

    // Read until EOF, writing data to output as we go.
    boost::system::error_code error;
    while (boost::asio::read(socket, response,boost::asio::transfer_at_least(1), error))
    {
          std::cout << &response;
    }

    if (error != boost::asio::error::eof)
    {
          throw boost::system::system_error(error);
    }
}
catch (std::exception& e)
{
    std::cout << "Exception: " << e.what() << "\n";
}

return 0;

}

我正在使用app.post('/licence', function (req, res) { collectRequestData(req, result => { console.log(result); sleep(5000); connection.query('INSERT INTO licence SET ?',result, function (error, results, fields) { if (error) throw error; res.end(JSON.stringify(results)); }); }); }); function collectRequestData(request, callback) { const FORM_URLENCODED = 'application/json'; if(request.headers['content-type'] === FORM_URLENCODED) { let body = ''; request.on('data', chunk => { body += chunk.toString(); }); request.on('end', () => { callback(JSON.parse(body)); }); } else { callback(null); } 进行编译，它工作正常，然后在运行g++ -I boost file.cpp -o test.o -lboost_thread -lboost_system -lboost_regex -lpthread时出现错误。我的JSON_text看起来像这样./test.o host port route JSON_text。如果有人对我在做什么错有任何见解，将不胜感激。我正在为服务器使用ubuntu 18.04和nodejs。