Postman|Qt笔记-解决Could not get any response

Myth丶恋晨 2022-08-28 08:45 23阅读 0赞

这里Fiddler抓包是有显示的：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16][]

但Postman却提示Could not get any response

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16 1][]

经过各种分析，发现问题出现在服务端

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_18_color_FFFFFF_t_70_g_se_x_16][]

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;
        }
    };

关键：

![watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16 2][]

[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/ed526090ecfa46849d5b5ab6a7072989.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16 1]: /images/20220828/d9055e26dcb64cabac8cd35cfee492fe.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_18_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/7e31005a8692414c80b033bfedd9abeb.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBASVQxOTk1_size_20_color_FFFFFF_t_70_g_se_x_16 2]: /images/20220828/799c05dd564646d0a563b86db394b111.png