Working implementation

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src/mapserver/qgshttprequesthandler.cpp

@@ -401,6 +401,10 @@ void QgsHttpRequestHandler::setServiceException( QgsMapServiceException ex )
   serviceExceptionReportElem.appendChild( serviceExceptionElem );
 
   QByteArray ba = exceptionDoc.toByteArray();
+  // Clear response headers and body and set new exception
+  // TODO: check for headersSent()
+  clearHeaders();
+  clearBody();
   setHttpResponse( &ba, "text/xml" );
 }
 

src/mapserver/qgsrequesthandler.h

@@ -75,14 +75,21 @@ class QgsRequestHandler
     virtual int removeParameter( const QString &key ) = 0;
     /**Return a request parameter*/
     virtual QString parameter( const QString &key ) const = 0;
+    /**Return the response body*/
+    virtual QByteArray* body( ) { return &mBody; }
+    /**Return the requested format string*/
     QString format() const { return mFormat; }
+    /**Return the mime type for the response*/
+    QString infoFormat() const { return mInfoFormat; }
+    /**Return true if the HTTP headers were already sent to the client*/
     bool headersSent() { return mHeadersSent; }
     QString infoFormat() const { return mInfoFormat; }
 
   protected:
 
     virtual void sendHeaders( ) = 0;
     virtual void sendBody( ) const = 0;
+    QByteArray mBody; // The response payload
     /**This is set by the parseInput methods of the subclasses (parameter FORMAT, e.g. 'FORMAT=PNG')*/
     QByteArray mBody; // The response payload
     QString mFormat;