diff --git a/src/network/access/qhttpheaders.cpp b/src/network/access/qhttpheaders.cpp
index 1ea2890f21..7a640b509c 100644
--- a/src/network/access/qhttpheaders.cpp
+++ b/src/network/access/qhttpheaders.cpp
@@ -888,21 +888,6 @@ bool QHttpHeaders::contains(WellKnownHeader name) const
     return contains(headerNames[qToUnderlying(name)]);
 }
 
-/*!
-    Returns a list of unique header names.
-    Header names are case-insensitive, and the returned
-    names are lower-cased.
-*/
-QList<QByteArray> QHttpHeaders::names() const
-{
-    QList<QByteArray> names;
-    for (const Header &header: d->headers) {
-        if (!names.contains(header.name))
-            names.append(header.name);
-    }
-    return names;
-}
-
 /*!
     Removes the header \a name.
 
diff --git a/src/network/access/qhttpheaders.h b/src/network/access/qhttpheaders.h
index a153d7911e..1edbd03b12 100644
--- a/src/network/access/qhttpheaders.h
+++ b/src/network/access/qhttpheaders.h
@@ -222,8 +222,6 @@ public:
     Q_NETWORK_EXPORT bool contains(QAnyStringView name) const;
     Q_NETWORK_EXPORT bool contains(WellKnownHeader name) const;
 
-    Q_NETWORK_EXPORT QList<QByteArray> names() const;
-
     Q_NETWORK_EXPORT void clear();
     Q_NETWORK_EXPORT void removeAll(QAnyStringView name);
     Q_NETWORK_EXPORT void removeAll(WellKnownHeader name);
diff --git a/src/network/access/qnetworkrequestfactory.cpp b/src/network/access/qnetworkrequestfactory.cpp
index 8a1ade8f78..0941304404 100644
--- a/src/network/access/qnetworkrequestfactory.cpp
+++ b/src/network/access/qnetworkrequestfactory.cpp
@@ -9,6 +9,7 @@
 #endif
 
 #include <QtCore/qloggingcategory.h>
+#include <QtCore/qmap.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -497,7 +498,7 @@ QNetworkRequest QNetworkRequestFactoryPrivate::newRequest(const QUrl &url) const
     // may be multiple values per name. Note: this would not necessarily
     // produce right result for 'Set-Cookie' header if it has multiple values,
     // but since it is a purely server-side (response) header, not relevant here.
-    const auto headerNames = headers.names();
+    const auto headerNames = headers.toMultiMap().uniqueKeys(); // ### fixme: port QNR to QHH
     for (const auto &name : headerNames)
         request.setRawHeader(name, headers.combinedValue(name));
 
diff --git a/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp b/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
index 5f6f915420..6a324c611d 100644
--- a/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
+++ b/tests/auto/network/access/qhttpheaders/tst_qhttpheaders.cpp
@@ -166,26 +166,6 @@ void tst_QHttpHeaders::accessors()
 #undef EXISTS_N_TIMES
 #undef EXISTS_NOT
 
-    // names()
-    h1.clear();
-    QVERIFY(h1.names().isEmpty());
-    h1.append(n1, v1);
-    QCOMPARE(h1.names().size(), 1);
-    QCOMPARE(h1.size(), 1);
-    QVERIFY(h1.names().contains(n1));
-    h1.append(n2, v2);
-    QCOMPARE(h1.names().size(), 2);
-    QCOMPARE(h1.size(), 2);
-    QVERIFY(h1.names().contains(n1));
-    QVERIFY(h1.names().contains(n2));
-    h1.append(n1, v1);
-    h1.append(n1, v1);
-    QCOMPARE(h1.size(), 4);
-    QCOMPARE(h1.names().size(), 2);
-    h1.append(N1, v1); // uppercase of n1
-    QCOMPARE(h1.size(), 5);
-    QCOMPARE(h1.names().size(), 2);
-
     // valueAt()
     h1.clear();
     h1.append(n1, v1);
@@ -353,7 +333,9 @@ void tst_QHttpHeaders::headerNameField()
     h1.append(u"abcdefghijklmnopqrstuvwyxzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!#$%&'*+-.^_`|~"_s,
               v1);
     QCOMPARE(h1.size(), 4);
-    QCOMPARE(h1.names().size(), 1);
+    QCOMPARE(h1.nameAt(0), h1.nameAt(1));
+    QCOMPARE(h1.nameAt(1), h1.nameAt(2));
+    QCOMPARE(h1.nameAt(2), h1.nameAt(3));
     h1.clear();
 
     // Error cases