4.x: ClientRequestBase incorrectly rejects non-lowercase schemes #10752 (#10780)

Signed-off-by: Jorge Bescos Gascon <[email protected]>

Author: jbescos

webclient/api/src/main/java/io/helidon/webclient/api/ClientRequestBase.java

@@ -475,7 +475,8 @@ private static String nextRequestId(String protocolId) {
     }
 
     private R validateAndSubmit(Object entity) {
-        if (!SUPPORTED_SCHEMES.contains(uri().scheme())) {
+        String scheme = uri().scheme();
+        if (scheme == null || !SUPPORTED_SCHEMES.contains(scheme.toLowerCase())) {
             throw new IllegalArgumentException(
                     String.format("Not supported scheme %s, client supported schemes are: %s",
                                   uri().scheme(),

webserver/tests/webserver/src/test/java/io/helidon/webserver/tests/RequestedUriTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates.
+ * Copyright (c) 2023, 2025 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -75,4 +75,16 @@ void ipV6Test() {
                 () -> assertThat(response.status(), is(Status.OK_200))
         );
     }
+
+    @Test
+    void schemeCaseTest() {
+        int port = webServer.port();
+        WebClient client = WebClient.builder()
+                .baseUri("hTTp://localhost:" + port)
+                .build();
+        ClientResponseTyped<String> response = client.get()
+                .path("/uri")
+                .request(String.class);
+        assertThat(response.status(), is(Status.OK_200));
+    }
 }