HTTP中CORS跨域请求的实现（C++|Qt框架实现）
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HTTP中CORS跨域请求的实现（C++|Qt框架实现）
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目錄
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背景
關鍵
演示及源碼
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背景
HTTP中CORS跨域請求，可以獲取其他服務器的數據；
這里用Qt框架實現！
邏輯如下：
瀏覽器訪問127.0.0.1:80端口！80端口請求了127.0.0.1:81的數據！
這里都是指資源！
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關鍵
需要在127.0.0.1:81服務器中的HTTP數據包頭添加如下數據：
Access-Control-Allow-Origin: *\r\n?
演示及源碼
上面的script就是向127.0.0.1:81端口的數據：
請求頭如下：
程序結構如下：
widget.h
#ifndef WIDGET_H #define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE class QTcpServer; class QTcpSocket; QT_END_NAMESPACEnamespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();protected slots:void newConnectionSlot80();void newConnectionSlot81();void errorStringSlot80();void errorStringSlot81();void sendMsg80();void sendMsg81();private:Ui::Widget *ui;QTcpServer *m_tcpServer80;QTcpSocket *m_tcpSocket80;QTcpServer *m_tcpServer81;QTcpSocket *m_tcpSocket81; };#endif // WIDGET_Hmain.cpp
#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }widget.cpp
#include "widget.h" #include "ui_widget.h" #include <QTcpServer> #include <QDebug> #include <QTcpSocket>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);m_tcpServer80 = new QTcpServer(this);m_tcpServer80->listen(QHostAddress::Any, 80);m_tcpServer81 = new QTcpServer(this);m_tcpServer81->listen(QHostAddress::Any, 81);connect(m_tcpServer80, SIGNAL(newConnection()), this, SLOT(newConnectionSlot80()));connect(m_tcpServer81, SIGNAL(newConnection()), this, SLOT(newConnectionSlot81()));connect(m_tcpServer80, SIGNAL(acceptError(QAbstractSocket::SocketError)), this, SLOT(errorStringSlot80()));connect(m_tcpServer81, SIGNAL(acceptError(QAbstractSocket::SocketError)), this, SLOT(errorStringSlot81())); }Widget::~Widget() {delete ui;m_tcpServer80->close();m_tcpServer81->close(); }void Widget::newConnectionSlot80() {qDebug() << "newConnectionSlot80() called";m_tcpSocket80 = m_tcpServer80->nextPendingConnection();connect(m_tcpSocket80, SIGNAL(readyRead()), this, SLOT(sendMsg80())); }void Widget::newConnectionSlot81() {qDebug() << "newConnectionSlot81() called";m_tcpSocket81 = m_tcpServer81->nextPendingConnection();connect(m_tcpSocket81, SIGNAL(readyRead()), this, SLOT(sendMsg81())); }void Widget::errorStringSlot80() {qDebug() << m_tcpServer80->errorString(); }void Widget::errorStringSlot81() {qDebug() << m_tcpServer81->errorString(); }void Widget::sendMsg80() {QString contentStr = "<html>""<head>""<title>""Socket 80""</title>""</head>""<body>""<h1>Socket 80</h1>""<script src=\"http://127.0.0.1:81\"></script>""</body>""</html>";//send msgQString str = "HTTP/1.1 200 OK\r\n";str.append("Server:nginx\r\n");str.append("Content-Type:text/html\r\n");str.append("Access-Control-Allow-Origin: *\r\n");str.append("Connection:keep-alive\r\n");str.append(QString("Content-Length:%1\r\n\r\n").arg(contentStr.size()));str.append(contentStr);qDebug() << str;m_tcpSocket80->write(str.toStdString().c_str()); }void Widget::sendMsg81() {QString contentStr = "<html>""<head>""<title>""Socket 81""</title>""</head>""<body>""<h1>Socket 81</h1>""</body>""</html>";//send msgQString str = "HTTP/1.1 200 OK\r\n";str.append("Server:nginx\r\n");str.append("Content-Type:text/html\r\n");str.append("Connection:keep-alive\r\n");str.append("Access-Control-Allow-Origin: *\r\n");str.append(QString("Content-Length:%1\r\n\r\n").arg(contentStr.size()));str.append(contentStr);qDebug() << str;m_tcpSocket81->write(str.toStdString().c_str()); }?
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