diff --git a/src/network/kernel/qauthenticator.cpp b/src/network/kernel/qauthenticator.cpp
index 4daf11cb3e..f79a7196bf 100644
--- a/src/network/kernel/qauthenticator.cpp
+++ b/src/network/kernel/qauthenticator.cpp
@@ -423,6 +423,26 @@ void QAuthenticatorPrivate::updateCredentials()
     }
 }
 
+bool QAuthenticatorPrivate::isMethodSupported(QByteArrayView method)
+{
+    Q_ASSERT(!method.startsWith(' ')); // This should be trimmed during parsing
+    auto separator = method.indexOf(' ');
+    if (separator != -1)
+        method = method.first(separator);
+    const auto isSupported = [method](QByteArrayView reference) {
+        return method.compare(reference, Qt::CaseInsensitive) == 0;
+    };
+    static const char methods[][10] = {
+        "basic",
+        "ntlm",
+        "digest",
+#if QT_CONFIG(sspi) || QT_CONFIG(gssapi)
+        "negotiate",
+#endif
+    };
+    return std::any_of(methods, methods + std::size(methods), isSupported);
+}
+
 void QAuthenticatorPrivate::parseHttpResponse(const QList<QPair<QByteArray, QByteArray> > &values, bool isProxy, const QString &host)
 {
 #if !QT_CONFIG(gssapi)
diff --git a/src/network/kernel/qauthenticator_p.h b/src/network/kernel/qauthenticator_p.h
index 1813634ee0..9ef6330ceb 100644
--- a/src/network/kernel/qauthenticator_p.h
+++ b/src/network/kernel/qauthenticator_p.h
@@ -115,6 +115,8 @@ public:
 
     void parseHttpResponse(const QList<QPair<QByteArray, QByteArray> >&, bool isProxy, const QString &host);
     void updateCredentials();
+
+    static bool isMethodSupported(QByteArrayView method);
 };
 
 
diff --git a/tests/auto/network/kernel/qauthenticator/tst_qauthenticator.cpp b/tests/auto/network/kernel/qauthenticator/tst_qauthenticator.cpp
index df5543a28e..529386f50f 100644
--- a/tests/auto/network/kernel/qauthenticator/tst_qauthenticator.cpp
+++ b/tests/auto/network/kernel/qauthenticator/tst_qauthenticator.cpp
@@ -49,6 +49,8 @@ private Q_SLOTS:
     void ntlmAuth();
 
     void equalityOperators();
+
+    void isMethodSupported();
 };
 
 tst_QAuthenticator::tst_QAuthenticator()
@@ -163,6 +165,22 @@ void tst_QAuthenticator::equalityOperators()
     QVERIFY(s2 != s1);
 }
 
+void tst_QAuthenticator::isMethodSupported()
+{
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("basic"));
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("Basic realm=\"Shadow\""));
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("DIgesT"));
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("NTLM"));
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("ntlm"));
+#if QT_CONFIG(sspi) || QT_CONFIG(gssapi)
+    QVERIFY(QAuthenticatorPrivate::isMethodSupported("negotiate"));
+#else
+    QVERIFY(!QAuthenticatorPrivate::isMethodSupported("negotiate"));
+#endif
+
+    QVERIFY(!QAuthenticatorPrivate::isMethodSupported("Bearer"));
+}
+
 QTEST_MAIN(tst_QAuthenticator);
 
 #include "tst_qauthenticator.moc"