Send Date http header

It's not strict required but often expected.
change class to namespace
cleanup header

src/base/http/responsegenerator.cpp

@@ -29,9 +29,12 @@
  * Contact : chris@qbittorrent.org
  */
 
-#include "base/utils/gzip.h"
 #include "responsegenerator.h"
 
+#include <QDateTime>
+
+#include "base/utils/gzip.h"
+
 using namespace Http;
 
 QByteArray ResponseGenerator::generate(Response response)
@@ -49,6 +52,7 @@ QByteArray ResponseGenerator::generate(Response response)
     }
 
     response.headers[HEADER_CONTENT_LENGTH] = QString::number(response.content.length());
+    response.headers[HEADER_DATE] = httpDate();
 
     QString ret(QLatin1String("HTTP/1.1 %1 %2\r\n%3\r\n"));
 
@@ -64,3 +68,12 @@ QByteArray ResponseGenerator::generate(Response response)
 
     return ret.toUtf8() + response.content;
 }
+
+QString ResponseGenerator::httpDate()
+{
+    // [RFC 7231] 7.1.1.1. Date/Time Formats
+   // example: "Sun, 06 Nov 1994 08:49:37 GMT"
+
+    return QLocale::c().toString(QDateTime::currentDateTimeUtc(), QLatin1String("ddd, dd MMM yyyy HH:mm:ss"))
+        .append(QLatin1String(" GMT"));
+}

src/base/http/responsegenerator.h

@@ -37,10 +37,10 @@
 
 namespace Http
 {
-    class ResponseGenerator
+    namespace ResponseGenerator
     {
-    public:
-        static QByteArray generate(Response response);
+        QByteArray generate(Response response);
+        QString httpDate();
     };
 }
 

src/base/http/types.h

@@ -47,6 +47,7 @@ namespace Http
     const QString HEADER_X_XSS_PROTECTION = "X-XSS-Protection";
     const QString HEADER_X_CONTENT_TYPE_OPTIONS = "X-Content-Type-Options";
     const QString HEADER_CONTENT_SECURITY_POLICY = "Content-Security-Policy";
+    const QString HEADER_DATE = "Date";
 
     const QString CONTENT_TYPE_CSS = "text/css; charset=UTF-8";
     const QString CONTENT_TYPE_GIF = "image/gif";