diff --git a/src/base/bittorrent/torrenthandle.cpp b/src/base/bittorrent/torrenthandle.cpp
index 6b0da372d..00caaf88f 100644
--- a/src/base/bittorrent/torrenthandle.cpp
+++ b/src/base/bittorrent/torrenthandle.cpp
@@ -303,7 +303,7 @@ qlonglong TorrentHandle::totalSize() const
     return m_torrentInfo.totalSize();
 }
 
-// get the size of the torrent without the filtered files
+// size without the "don't download" files
 qlonglong TorrentHandle::wantedSize() const
 {
     return m_nativeStatus.total_wanted;
@@ -1031,7 +1031,7 @@ qlonglong TorrentHandle::seedingTime() const
 #endif
 }
 
-qulonglong TorrentHandle::eta() const
+qlonglong TorrentHandle::eta() const
 {
     if (isPaused()) return MAX_ETA;
 
diff --git a/src/base/bittorrent/torrenthandle.h b/src/base/bittorrent/torrenthandle.h
index 80ce1af9a..6c5c31341 100644
--- a/src/base/bittorrent/torrenthandle.h
+++ b/src/base/bittorrent/torrenthandle.h
@@ -271,7 +271,7 @@ namespace BitTorrent
         qlonglong activeTime() const;
         qlonglong finishedTime() const;
         qlonglong seedingTime() const;
-        qulonglong eta() const;
+        qlonglong eta() const;
         QVector<qreal> filesProgress() const;
         int seedsCount() const;
         int peersCount() const;
diff --git a/src/base/rss/rss_autodownloadrule.cpp b/src/base/rss/rss_autodownloadrule.cpp
index fda77ce85..7bc18108d 100644
--- a/src/base/rss/rss_autodownloadrule.cpp
+++ b/src/base/rss/rss_autodownloadrule.cpp
@@ -62,7 +62,7 @@ namespace
         return TriStateBool::Undefined;
     }
 
-    QJsonValue triStateBoolToJsonValue(const TriStateBool &triStateBool)
+    QJsonValue triStateBoolToJsonValue(const TriStateBool triStateBool)
     {
         switch (static_cast<signed char>(triStateBool)) {
         case 0:  return false;
@@ -80,7 +80,7 @@ namespace
         }
     }
 
-    int triStateBoolToAddPausedLegacy(const TriStateBool &triStateBool)
+    int triStateBoolToAddPausedLegacy(const TriStateBool triStateBool)
     {
         switch (static_cast<signed char>(triStateBool)) {
         case 0:  return 2; // never
@@ -584,7 +584,7 @@ TriStateBool AutoDownloadRule::addPaused() const
     return m_dataPtr->addPaused;
 }
 
-void AutoDownloadRule::setAddPaused(const TriStateBool &addPaused)
+void AutoDownloadRule::setAddPaused(const TriStateBool addPaused)
 {
     m_dataPtr->addPaused = addPaused;
 }
@@ -594,7 +594,7 @@ TriStateBool AutoDownloadRule::createSubfolder() const
     return m_dataPtr->createSubfolder;
 }
 
-void AutoDownloadRule::setCreateSubfolder(const TriStateBool &createSubfolder)
+void AutoDownloadRule::setCreateSubfolder(const TriStateBool createSubfolder)
 {
     m_dataPtr->createSubfolder = createSubfolder;
 }
diff --git a/src/base/rss/rss_autodownloadrule.h b/src/base/rss/rss_autodownloadrule.h
index 4c4604b6e..2ab2746e1 100644
--- a/src/base/rss/rss_autodownloadrule.h
+++ b/src/base/rss/rss_autodownloadrule.h
@@ -78,9 +78,9 @@ namespace RSS
         QString savePath() const;
         void setSavePath(const QString &savePath);
         TriStateBool addPaused() const;
-        void setAddPaused(const TriStateBool &addPaused);
+        void setAddPaused(TriStateBool addPaused);
         TriStateBool createSubfolder() const;
-        void setCreateSubfolder(const TriStateBool &createSubfolder);
+        void setCreateSubfolder(TriStateBool createSubfolder);
         QString assignedCategory() const;
         void setCategory(const QString &category);
 
diff --git a/src/gui/transferlistwidget.cpp b/src/gui/transferlistwidget.cpp
index 18fe680ed..751cf4d22 100644
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@@ -101,7 +101,7 @@ namespace
     void openDestinationFolder(const BitTorrent::TorrentHandle *const torrent)
     {
 #ifdef Q_OS_MACOS
-        MacUtils::openFiles(QSet<QString>{torrent->contentPath(true)});
+        MacUtils::openFiles({torrent->contentPath(true)});
 #else
         if (torrent->filesCount() == 1)
             Utils::Gui::openFolderSelect(torrent->contentPath(true));
diff --git a/src/webui/api/apicontroller.cpp b/src/webui/api/apicontroller.cpp
index 140ade32d..03d2a1ea0 100644
--- a/src/webui/api/apicontroller.cpp
+++ b/src/webui/api/apicontroller.cpp
@@ -69,7 +69,7 @@ const DataMap &APIController::data() const
     return m_data;
 }
 
-void APIController::checkParams(const QSet<QString> &requiredParams) const
+void APIController::requireParams(const QVector<QString> &requiredParams) const
 {
     const bool hasAllRequiredParams = std::all_of(requiredParams.cbegin(), requiredParams.cend()
         , [this](const QString &requiredParam)
diff --git a/src/webui/api/apicontroller.h b/src/webui/api/apicontroller.h
index 0d2044efb..ad4c192a9 100644
--- a/src/webui/api/apicontroller.h
+++ b/src/webui/api/apicontroller.h
@@ -30,8 +30,8 @@
 
 #include <QHash>
 #include <QObject>
-#include <QSet>
 #include <QVariant>
+#include <QVector>
 
 class QString;
 
@@ -60,7 +60,7 @@ public:
 protected:
     const StringMap &params() const;
     const DataMap &data() const;
-    void checkParams(const QSet<QString> &requiredParams) const;
+    void requireParams(const QVector<QString> &requiredParams) const;
 
     void setResult(const QString &result);
     void setResult(const QJsonArray &result);
diff --git a/src/webui/api/appcontroller.cpp b/src/webui/api/appcontroller.cpp
index 3cfd724be..a12c8519e 100644
--- a/src/webui/api/appcontroller.cpp
+++ b/src/webui/api/appcontroller.cpp
@@ -316,7 +316,7 @@ void AppController::preferencesAction()
 
 void AppController::setPreferencesAction()
 {
-    checkParams({"json"});
+    requireParams({"json"});
 
     Preferences *const pref = Preferences::instance();
     auto session = BitTorrent::Session::instance();
@@ -762,7 +762,7 @@ void AppController::networkInterfaceListAction()
 
 void AppController::networkInterfaceAddressListAction()
 {
-    checkParams({"iface"});
+    requireParams({"iface"});
 
     const QString ifaceName = params().value("iface");
     QJsonArray addressList;
diff --git a/src/webui/api/rsscontroller.cpp b/src/webui/api/rsscontroller.cpp
index bbc88e729..c2f951622 100644
--- a/src/webui/api/rsscontroller.cpp
+++ b/src/webui/api/rsscontroller.cpp
@@ -43,7 +43,7 @@ using Utils::String::parseBool;
 
 void RSSController::addFolderAction()
 {
-    checkParams({"path"});
+    requireParams({"path"});
 
     const QString path = params()["path"].trimmed();
     QString error;
@@ -53,7 +53,7 @@ void RSSController::addFolderAction()
 
 void RSSController::addFeedAction()
 {
-    checkParams({"url", "path"});
+    requireParams({"url", "path"});
 
     const QString url = params()["url"].trimmed();
     const QString path = params()["path"].trimmed();
@@ -64,7 +64,7 @@ void RSSController::addFeedAction()
 
 void RSSController::removeItemAction()
 {
-    checkParams({"path"});
+    requireParams({"path"});
 
     const QString path = params()["path"].trimmed();
     QString error;
@@ -74,7 +74,7 @@ void RSSController::removeItemAction()
 
 void RSSController::moveItemAction()
 {
-    checkParams({"itemPath", "destPath"});
+    requireParams({"itemPath", "destPath"});
 
     const QString itemPath = params()["itemPath"].trimmed();
     const QString destPath = params()["destPath"].trimmed();
@@ -93,7 +93,7 @@ void RSSController::itemsAction()
 
 void RSSController::refreshItemAction()
 {
-    checkParams({"itemPath"});
+    requireParams({"itemPath"});
 
     const QString itemPath {params()["itemPath"]};
     RSS::Item *item = RSS::Session::instance()->itemByPath(itemPath);
@@ -103,7 +103,7 @@ void RSSController::refreshItemAction()
 
 void RSSController::setRuleAction()
 {
-    checkParams({"ruleName", "ruleDef"});
+    requireParams({"ruleName", "ruleDef"});
 
     const QString ruleName {params()["ruleName"].trimmed()};
     const QByteArray ruleDef {params()["ruleDef"].trimmed().toUtf8()};
@@ -114,7 +114,7 @@ void RSSController::setRuleAction()
 
 void RSSController::renameRuleAction()
 {
-    checkParams({"ruleName", "newRuleName"});
+    requireParams({"ruleName", "newRuleName"});
 
     const QString ruleName {params()["ruleName"].trimmed()};
     const QString newRuleName {params()["newRuleName"].trimmed()};
@@ -124,7 +124,7 @@ void RSSController::renameRuleAction()
 
 void RSSController::removeRuleAction()
 {
-    checkParams({"ruleName"});
+    requireParams({"ruleName"});
 
     const QString ruleName {params()["ruleName"].trimmed()};
     RSS::AutoDownloader::instance()->removeRule(ruleName);
diff --git a/src/webui/api/searchcontroller.cpp b/src/webui/api/searchcontroller.cpp
index 1523cece5..8b9b125df 100644
--- a/src/webui/api/searchcontroller.cpp
+++ b/src/webui/api/searchcontroller.cpp
@@ -63,7 +63,7 @@ namespace
 
 void SearchController::startAction()
 {
-    checkParams({"pattern", "category", "plugins"});
+    requireParams({"pattern", "category", "plugins"});
 
     if (!Utils::ForeignApps::pythonInfo().isValid())
         throw APIError(APIErrorType::Conflict, "Python must be installed to use the Search Engine.");
@@ -109,7 +109,7 @@ void SearchController::startAction()
 
 void SearchController::stopAction()
 {
-    checkParams({"id"});
+    requireParams({"id"});
 
     const int id = params()["id"].toInt();
     ISession *const session = sessionManager()->session();
@@ -151,7 +151,7 @@ void SearchController::statusAction()
 
 void SearchController::resultsAction()
 {
-    checkParams({"id"});
+    requireParams({"id"});
 
     const int id = params()["id"].toInt();
     int limit = params()["limit"].toInt();
@@ -184,7 +184,7 @@ void SearchController::resultsAction()
 
 void SearchController::deleteAction()
 {
-    checkParams({"id"});
+    requireParams({"id"});
 
     const int id = params()["id"].toInt();
     ISession *const session = sessionManager()->session();
@@ -222,7 +222,7 @@ void SearchController::pluginsAction()
 
 void SearchController::installPluginAction()
 {
-    checkParams({"sources"});
+    requireParams({"sources"});
 
     const QStringList sources = params()["sources"].split('|');
     for (const QString &source : sources)
@@ -231,7 +231,7 @@ void SearchController::installPluginAction()
 
 void SearchController::uninstallPluginAction()
 {
-    checkParams({"names"});
+    requireParams({"names"});
 
     const QStringList names = params()["names"].split('|');
     for (const QString &name : names)
@@ -240,7 +240,7 @@ void SearchController::uninstallPluginAction()
 
 void SearchController::enablePluginAction()
 {
-    checkParams({"names", "enable"});
+    requireParams({"names", "enable"});
 
     const QStringList names = params()["names"].split('|');
     const bool enable = Utils::String::parseBool(params()["enable"].trimmed(), false);
diff --git a/src/webui/api/torrentscontroller.cpp b/src/webui/api/torrentscontroller.cpp
index 62c4196a2..cd7535344 100644
--- a/src/webui/api/torrentscontroller.cpp
+++ b/src/webui/api/torrentscontroller.cpp
@@ -317,7 +317,7 @@ void TorrentsController::infoAction()
 //   - "comment": Torrent comment
 void TorrentsController::propertiesAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     QJsonObject dataDict;
@@ -385,7 +385,7 @@ void TorrentsController::propertiesAction()
 //   - "msg": Tracker message (last)
 void TorrentsController::trackersAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     const BitTorrent::TorrentHandle *const torrent = BitTorrent::Session::instance()->findTorrent(hash);
@@ -419,7 +419,7 @@ void TorrentsController::trackersAction()
 //   - "url": Web seed URL
 void TorrentsController::webseedsAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     QJsonArray webSeedList;
@@ -448,7 +448,7 @@ void TorrentsController::webseedsAction()
 //        and the second number is the ending piece index (inclusive)
 void TorrentsController::filesAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     QJsonArray fileList;
@@ -491,7 +491,7 @@ void TorrentsController::filesAction()
 // The return value is a JSON-formatted array of strings (hex strings).
 void TorrentsController::pieceHashesAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     QJsonArray pieceHashes;
@@ -513,7 +513,7 @@ void TorrentsController::pieceHashesAction()
 // 2: piece already downloaded
 void TorrentsController::pieceStatesAction()
 {
-    checkParams({"hash"});
+    requireParams({"hash"});
 
     const QString hash {params()["hash"]};
     QJsonArray pieceStates;
@@ -606,7 +606,7 @@ void TorrentsController::addAction()
 
 void TorrentsController::addTrackersAction()
 {
-    checkParams({"hash", "urls"});
+    requireParams({"hash", "urls"});
 
     const QString hash = params()["hash"];
 
@@ -625,7 +625,7 @@ void TorrentsController::addTrackersAction()
 
 void TorrentsController::editTrackerAction()
 {
-    checkParams({"hash", "origUrl", "newUrl"});
+    requireParams({"hash", "origUrl", "newUrl"});
 
     const QString hash = params()["hash"];
     const QString origUrl = params()["origUrl"];
@@ -666,7 +666,7 @@ void TorrentsController::editTrackerAction()
 
 void TorrentsController::removeTrackersAction()
 {
-    checkParams({"hash", "urls"});
+    requireParams({"hash", "urls"});
 
     const QString hash = params()["hash"];
     const QStringList urls = params()["urls"].split('|');
@@ -694,7 +694,7 @@ void TorrentsController::removeTrackersAction()
 
 void TorrentsController::addPeersAction()
 {
-    checkParams({"hashes", "peers"});
+    requireParams({"hashes", "peers"});
 
     const QStringList hashes = params()["hashes"].split('|');
     const QStringList peers = params()["peers"].split('|');
@@ -730,7 +730,7 @@ void TorrentsController::addPeersAction()
 
 void TorrentsController::pauseAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes = params()["hashes"].split('|');
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->pause(); });
@@ -738,7 +738,7 @@ void TorrentsController::pauseAction()
 
 void TorrentsController::resumeAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes = params()["hashes"].split('|');
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->resume(); });
@@ -746,7 +746,7 @@ void TorrentsController::resumeAction()
 
 void TorrentsController::filePrioAction()
 {
-    checkParams({"hash", "id", "priority"});
+    requireParams({"hash", "id", "priority"});
 
     const QString hash = params()["hash"];
     bool ok = false;
@@ -785,7 +785,7 @@ void TorrentsController::filePrioAction()
 
 void TorrentsController::uploadLimitAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     QJsonObject map;
@@ -802,7 +802,7 @@ void TorrentsController::uploadLimitAction()
 
 void TorrentsController::downloadLimitAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     QJsonObject map;
@@ -819,7 +819,7 @@ void TorrentsController::downloadLimitAction()
 
 void TorrentsController::setUploadLimitAction()
 {
-    checkParams({"hashes", "limit"});
+    requireParams({"hashes", "limit"});
 
     qlonglong limit = params()["limit"].toLongLong();
     if (limit == 0)
@@ -831,7 +831,7 @@ void TorrentsController::setUploadLimitAction()
 
 void TorrentsController::setDownloadLimitAction()
 {
-    checkParams({"hashes", "limit"});
+    requireParams({"hashes", "limit"});
 
     qlonglong limit = params()["limit"].toLongLong();
     if (limit == 0)
@@ -843,7 +843,7 @@ void TorrentsController::setDownloadLimitAction()
 
 void TorrentsController::setShareLimitsAction()
 {
-    checkParams({"hashes", "ratioLimit", "seedingTimeLimit"});
+    requireParams({"hashes", "ratioLimit", "seedingTimeLimit"});
 
     const qreal ratioLimit = params()["ratioLimit"].toDouble();
     const qlonglong seedingTimeLimit = params()["seedingTimeLimit"].toLongLong();
@@ -858,7 +858,7 @@ void TorrentsController::setShareLimitsAction()
 
 void TorrentsController::toggleSequentialDownloadAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->toggleSequentialDownload(); });
@@ -866,7 +866,7 @@ void TorrentsController::toggleSequentialDownloadAction()
 
 void TorrentsController::toggleFirstLastPiecePrioAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->toggleFirstLastPiecePriority(); });
@@ -874,7 +874,7 @@ void TorrentsController::toggleFirstLastPiecePrioAction()
 
 void TorrentsController::setSuperSeedingAction()
 {
-    checkParams({"hashes", "value"});
+    requireParams({"hashes", "value"});
 
     const bool value {parseBool(params()["value"], false)};
     const QStringList hashes {params()["hashes"].split('|')};
@@ -883,7 +883,7 @@ void TorrentsController::setSuperSeedingAction()
 
 void TorrentsController::setForceStartAction()
 {
-    checkParams({"hashes", "value"});
+    requireParams({"hashes", "value"});
 
     const bool value {parseBool(params()["value"], false)};
     const QStringList hashes {params()["hashes"].split('|')};
@@ -892,7 +892,7 @@ void TorrentsController::setForceStartAction()
 
 void TorrentsController::deleteAction()
 {
-    checkParams({"hashes", "deleteFiles"});
+    requireParams({"hashes", "deleteFiles"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const DeleteOption deleteOption = parseBool(params()["deleteFiles"], false)
@@ -905,7 +905,7 @@ void TorrentsController::deleteAction()
 
 void TorrentsController::increasePrioAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     if (!BitTorrent::Session::instance()->isQueueingSystemEnabled())
         throw APIError(APIErrorType::Conflict, tr("Torrent queueing must be enabled"));
@@ -916,7 +916,7 @@ void TorrentsController::increasePrioAction()
 
 void TorrentsController::decreasePrioAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     if (!BitTorrent::Session::instance()->isQueueingSystemEnabled())
         throw APIError(APIErrorType::Conflict, tr("Torrent queueing must be enabled"));
@@ -927,7 +927,7 @@ void TorrentsController::decreasePrioAction()
 
 void TorrentsController::topPrioAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     if (!BitTorrent::Session::instance()->isQueueingSystemEnabled())
         throw APIError(APIErrorType::Conflict, tr("Torrent queueing must be enabled"));
@@ -938,7 +938,7 @@ void TorrentsController::topPrioAction()
 
 void TorrentsController::bottomPrioAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     if (!BitTorrent::Session::instance()->isQueueingSystemEnabled())
         throw APIError(APIErrorType::Conflict, tr("Torrent queueing must be enabled"));
@@ -949,7 +949,7 @@ void TorrentsController::bottomPrioAction()
 
 void TorrentsController::setLocationAction()
 {
-    checkParams({"hashes", "location"});
+    requireParams({"hashes", "location"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const QString newLocation {params()["location"].trimmed()};
@@ -975,7 +975,7 @@ void TorrentsController::setLocationAction()
 
 void TorrentsController::renameAction()
 {
-    checkParams({"hash", "name"});
+    requireParams({"hash", "name"});
 
     const QString hash = params()["hash"];
     QString name = params()["name"].trimmed();
@@ -993,7 +993,7 @@ void TorrentsController::renameAction()
 
 void TorrentsController::setAutoManagementAction()
 {
-    checkParams({"hashes", "enable"});
+    requireParams({"hashes", "enable"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const bool isEnabled {parseBool(params()["enable"], false)};
@@ -1006,7 +1006,7 @@ void TorrentsController::setAutoManagementAction()
 
 void TorrentsController::recheckAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->forceRecheck(); });
@@ -1014,7 +1014,7 @@ void TorrentsController::recheckAction()
 
 void TorrentsController::reannounceAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     applyToTorrents(hashes, [](BitTorrent::TorrentHandle *const torrent) { torrent->forceReannounce(); });
@@ -1022,7 +1022,7 @@ void TorrentsController::reannounceAction()
 
 void TorrentsController::setCategoryAction()
 {
-    checkParams({"hashes", "category"});
+    requireParams({"hashes", "category"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const QString category {params()["category"].trimmed()};
@@ -1036,7 +1036,7 @@ void TorrentsController::setCategoryAction()
 
 void TorrentsController::createCategoryAction()
 {
-    checkParams({"category"});
+    requireParams({"category"});
 
     const QString category {params()["category"].trimmed()};
     const QString savePath {params()["savePath"]};
@@ -1053,7 +1053,7 @@ void TorrentsController::createCategoryAction()
 
 void TorrentsController::editCategoryAction()
 {
-    checkParams({"category", "savePath"});
+    requireParams({"category", "savePath"});
 
     const QString category {params()["category"].trimmed()};
     const QString savePath {params()["savePath"]};
@@ -1067,7 +1067,7 @@ void TorrentsController::editCategoryAction()
 
 void TorrentsController::removeCategoriesAction()
 {
-    checkParams({"categories"});
+    requireParams({"categories"});
 
     const QStringList categories {params()["categories"].split('\n')};
     for (const QString &category : categories)
@@ -1091,7 +1091,7 @@ void TorrentsController::categoriesAction()
 
 void TorrentsController::addTagsAction()
 {
-    checkParams({"hashes", "tags"});
+    requireParams({"hashes", "tags"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const QStringList tags {params()["tags"].split(',', QString::SkipEmptyParts)};
@@ -1107,7 +1107,7 @@ void TorrentsController::addTagsAction()
 
 void TorrentsController::removeTagsAction()
 {
-    checkParams({"hashes"});
+    requireParams({"hashes"});
 
     const QStringList hashes {params()["hashes"].split('|')};
     const QStringList tags {params()["tags"].split(',', QString::SkipEmptyParts)};
@@ -1130,7 +1130,7 @@ void TorrentsController::removeTagsAction()
 
 void TorrentsController::createTagsAction()
 {
-    checkParams({"tags"});
+    requireParams({"tags"});
 
     const QStringList tags {params()["tags"].split(',', QString::SkipEmptyParts)};
 
@@ -1140,7 +1140,7 @@ void TorrentsController::createTagsAction()
 
 void TorrentsController::deleteTagsAction()
 {
-    checkParams({"tags"});
+    requireParams({"tags"});
 
     const QStringList tags {params()["tags"].split(',', QString::SkipEmptyParts)};
     for (const QString &tag : tags)
diff --git a/src/webui/api/transfercontroller.cpp b/src/webui/api/transfercontroller.cpp
index ea95f144a..1e70e8eed 100644
--- a/src/webui/api/transfercontroller.cpp
+++ b/src/webui/api/transfercontroller.cpp
@@ -90,7 +90,7 @@ void TransferController::downloadLimitAction()
 
 void TransferController::setUploadLimitAction()
 {
-    checkParams({"limit"});
+    requireParams({"limit"});
     qlonglong limit = params()["limit"].toLongLong();
     if (limit == 0) limit = -1;
 
@@ -99,7 +99,7 @@ void TransferController::setUploadLimitAction()
 
 void TransferController::setDownloadLimitAction()
 {
-    checkParams({"limit"});
+    requireParams({"limit"});
     qlonglong limit = params()["limit"].toLongLong();
     if (limit == 0) limit = -1;
 
@@ -119,7 +119,7 @@ void TransferController::speedLimitsModeAction()
 
 void TransferController::banPeersAction()
 {
-    checkParams({"peers"});
+    requireParams({"peers"});
 
     const QStringList peers = params()["peers"].split('|');
     for (const QString &peer : peers) {
diff --git a/src/webui/webapplication.cpp b/src/webui/webapplication.cpp
index 4ca16c11f..a1ea0c51a 100644
--- a/src/webui/webapplication.cpp
+++ b/src/webui/webapplication.cpp
@@ -267,12 +267,10 @@ void WebApplication::doProcessRequest()
     try {
         const QVariant result = controller->run(action, m_params, data);
         switch (result.userType()) {
-        case QMetaType::QString:
-            print(result.toString(), Http::CONTENT_TYPE_TXT);
-            break;
         case QMetaType::QJsonDocument:
             print(result.toJsonDocument().toJson(QJsonDocument::Compact), Http::CONTENT_TYPE_JSON);
             break;
+        case QMetaType::QString:
         default:
             print(result.toString(), Http::CONTENT_TYPE_TXT);
             break;