Poco::Net::HTTPClientSession json 数据 Content-Type 未收到

Question

所以我正在开发一个服务器端 Nodejs/expressjs 应用程序和一个客户端 c++/Poco 应用程序。我设法在托管服务器的位置和客户端之间创建了一个会话。但是，每当我尝试发送 JSON 有效负载时，express.js 都会将 req.body 显示为空。

除了 Content-Type 可能没有正确传输而且看起来确实如此之外，Google 并没有透露太多信息。我确实明确设置了它，但显然我错过了一步。

客户端

void upload(std::list<std::string>& args) {
    if (args.size() == 0 || args.front() == "--help") {
        help("upload");
        return;
    }

    std::string repo = args.front();
    args.pop_front();

    std::string name, language;
    auto depends = getDepends(name, language);

    // start making the poco json object here
    Poco::JSON::Object obj;
    obj.set("name", name);
    obj.set("url", repo);

    Poco::URI uri("http://url-of-my-server:50001/make_repo");
    std::string path(uri.getPathAndQuery());


    if (path.empty()) path = "/";

    HTTPClientSession session(uri.getHost(), uri.getPort());
    HTTPRequest request(HTTPRequest::HTTP_POST, path, HTTPMessage::HTTP_1_1);
    HTTPResponse response;

    std::ostream& o = session.sendRequest(request);

    std::cout << response.getStatus() << " " << response.getReason() << std::endl;

    session.setKeepAlive(true);
    request.setContentType("application/json");  // definately set Content-Type right?
    obj.stringify(std::cout);                    // can confirm it is spitting out the valid json here
    obj.stringify(o);                            // place the json in the request stream

    std::istream& s = session.receiveResponse(response);

    // do stuff with returned data
}

服务器：

var express = require('express');
var app = express();
var bodyParser = require('body-parser');

var database = require('./database.js');  // one of my files
var connection = database.connection;
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());

var port = 50001;   // explicitly set port because environment port kept forcing port 3000

// just a callback to make sure i'm connected to my sql server
connection.query('SELECT 1',function(err, rows) {
    if(err) {
        console.error("Could not connect to the database.");
    } else {
        console.log('connected to database: ' + connection.threadId);
    }

    app.get('/', function(req, res){
        res.send('hello world');
    });

    // this is the route I invoke, (and it is definately invoked)
    app.post('/make_repo', function(req, res, next) {

        console.log(req.headers); // this always returns '{ connection: 'Close', host: 'url-of-my-server:50001' }
        console.log(req.body); // this always returns '{}'

    });

    var listener = app.listen(port, function() {
        console.log("port: " + listener.address().port);
    });

});

看来这已经到了 Poco 的尽头，因为我可以从邮递员那里传输测试数据并且它报告得很好。我还在 Poco 上将KeepAlive 设置为 true，这似乎也被忽略了。有没有人用过 Poco 来提供足够的帮助？

Answer 1

对有状态的流式通信有点困惑。它是 http 并且在技术上仍然是无状态连接。必须在发送初始请求之前完成有关请求的所有信息，除了正文。

HTTPClientSession session(uri.getHost(), uri.getPort());
HTTPRequest request(HTTPRequest::HTTP_POST, path, HTTPMessage::HTTP_1_1);
HTTPResponse response;

std::stringstream ss;
obj.stringify(ss);
request.setKeepAlive(true);
request.setContentLength(ss.str().size());
request.setContentType("application/json");  // definately set Content-Type right?

std::ostream& o = session.sendRequest(request);
obj.stringify(o);             // can confirm it is spitting out the valid 

std::cout << response.getStatus() << " " << response.getReason() << std::endl;

另外，需要设置我之前尝试过但由于内容类型未正确发送而无法正常工作的 contentLength。正确设置内容长度和类型后，服务器可以顺利接收。