Postman|Qt笔记-解决Could not get any response

Posted 2021-10-24 IT1995

这里Fiddler抓包是有显示的：

 但Postman却提示Could not get any response

 经过各种分析，发现问题出现在服务端

 

主要的原因就是Content-Length这个值，这里的已经告诉客户端是utf-8编码的，但里面含有中文，对应的数据Content-Length与body里面的长度不一致。

服务端是这样计算长度的：

class HttpResponse {

public:
    static QString success(const QString &body){

        QString ret = "HTTP/1.1 200 OK\\r\\n"\\
                      "Date: %1\\r\\n"\\
                      "Pragma: no-cache\\r\\n"\\
                      "Content-Type: application/json; charset=utf-8\\r\\n"\\
                      "Cache-Control: no-cache\\r\\n"\\
                      "Server: It1995HttpsWebServer\\r\\n"\\
                      "Content-Length: %2\\r\\n"\\
                      "\\r\\n"\\
                      "%3";

        QLocale locale = QLocale::English;
        QString format = "ddd,dd MM yyyy hh:mm:ss";
        QString currentTime =locale.toString(QDateTime::currentDateTime().toUTC(), format) + " GMT";

        int length = body.size();
        ret = ret.arg(currentTime).arg(length).arg(body);
        return ret;
    }
};

这种方式不正确，没有转换成utf-8计算长度，正确的代码：

class HttpResponse {

public:
    static QString success(const QString &body){

        QString ret = "HTTP/1.1 200 OK\\r\\n"\\
                      "Date: %1\\r\\n"\\
                      "Pragma: no-cache\\r\\n"\\
                      "Content-Type: application/json; charset=utf-8\\r\\n"\\
                      "Cache-Control: no-cache\\r\\n"\\
                      "Server: It1995HttpsWebServer\\r\\n"\\
                      "Content-Length: %2\\r\\n"\\
                      "\\r\\n"\\
                      "%3";

        QLocale locale = QLocale::English;
        QString format = "ddd,dd MM yyyy hh:mm:ss";
        QString currentTime =locale.toString(QDateTime::currentDateTime().toUTC(), format) + " GMT";

        int length = body.toUtf8().size();
        ret = ret.arg(currentTime).arg(length).arg(body);
        return ret;
    }
};

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