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

Question

因此，我正在开发服务器端Nodejs / expressjs应用程序和客户端c ++ / Poco应用程序。我设法在托管服务器和客户端之间创建会话。但是，无论何时我尝试发送JSON有效负载，express.js都会将req.body显示为空。

Google并没有透露太多内容，除了Content-Type可能无法正确传输之外，看起来也是如此。我确实对其进行了明确设置，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发送测试数据，而且报告还不错。我还在Poco上将KeepAlive设置为true，这似乎也被忽略了。有没有人足够使用Poco来提供帮助？

Answer 1

有状态流通信风格让您有些困惑。它是http，从技术上讲仍然是无状态的连接。在发送初始请求之前，必须完成有关请求的所有信息（“身体除外”）。

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的contentLength，但是由于内容类型未正确发送而无法正常工作。正确设置内容长度和类型后，服务器正确接收，没有任何故障。