Improve tags, name, description because it's not given that file down…

…load is an http request and you can use this alogrithm for http requests and don't care about the file (just create a tmp file).

Don't allow the filename as optional because it fails without it anyway in the QgsFileDownloader.

src/analysis/processing/qgsalgorithmfiledownloader.cpp

@@ -35,12 +35,12 @@ QString QgsFileDownloaderAlgorithm::name() const
 
 QString QgsFileDownloaderAlgorithm::displayName() const
 {
-  return tr( "Download file" );
+  return tr( "Download file (HTTP request)" );
 }
 
 QStringList QgsFileDownloaderAlgorithm::tags() const
 {
-  return tr( "file,downloader,internet,url,fetch,get,https" ).split( ',' );
+  return tr( "file,downloader,internet,url,fetch,get,post,request,https" ).split( ',' );
 }
 
 QString QgsFileDownloaderAlgorithm::group() const
@@ -55,7 +55,7 @@ QString QgsFileDownloaderAlgorithm::groupId() const
 
 QString QgsFileDownloaderAlgorithm::shortHelpString() const
 {
-  return tr( "This algorithm downloads a URL on the file system." );
+  return tr( "This algorithm downloads a URL on the file system with an HTTP GET or POST request" );
 }
 
 QgsFileDownloaderAlgorithm *QgsFileDownloaderAlgorithm::createInstance() const
@@ -85,9 +85,8 @@ void QgsFileDownloaderAlgorithm::initAlgorithm( const QVariantMap & )
   dataParam->setHelp( QObject::tr( "The data to add in the body if the request is a POST" ) );
   dataParam->setFlags( dataParam->flags() | Qgis::ProcessingParameterFlag::Advanced );
   addParameter( dataParam.release() );
-
   addParameter( new QgsProcessingParameterFileDestination( QStringLiteral( "OUTPUT" ),
-                tr( "File destination" ), QObject::tr( "All files (*.*)" ), QVariant(), true ) );
+                tr( "File destination" ), QObject::tr( "All files (*.*)" ), QVariant(), false ) );
 }
 
 QVariantMap QgsFileDownloaderAlgorithm::processAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )