From 8b037a6a9f0ee42cf048ec37a73020c69074c9f9 Mon Sep 17 00:00:00 2001
From: Lukas Schwabe <lukas.schwabe@amag.ch>
Date: Thu, 20 Aug 2026 16:42:43 +0200
Subject: [PATCH 1/2] fix: use OData V4 path for OpenAPI server URL if no
 protocol is set to match @sap/cds default behavior

Signed-off-by: Lukas Schwabe <lukas.schwabe@amag.ch>
---
 lib/compile/index.js             |  2 +-
 test/lib/compile/openapi.test.js | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/compile/index.js b/lib/compile/index.js
index 1bfb40f..6dabd6d 100644
--- a/lib/compile/index.js
+++ b/lib/compile/index.js
@@ -156,7 +156,7 @@ function _getProtocols(csdl, csn, odataVersion) {
       protocols.push("odata");
     }
     else if (!service["@protocol"]) {
-      protocols.push("rest"); //taking rest as default in case no relevant protocol is there
+      protocols.push("odata"); // matches cds's default protocol when none is annotated
     } else if (service["@protocol"] === "none") {
       // if @protocol is 'none' then throw an error
       throw new Error(
diff --git a/test/lib/compile/openapi.test.js b/test/lib/compile/openapi.test.js
index 79e5374..24961dd 100644
--- a/test/lib/compile/openapi.test.js
+++ b/test/lib/compile/openapi.test.js
@@ -262,6 +262,21 @@ service CatalogService {
     assert(openapi.servers[0].url.includes('odata'));
   });
 
+  test('default service without @protocol renders server URL with odata/v4', () => {
+    const csn = cds.compile.to.csn(`
+      @path: 'catalog'
+      service CatalogService {
+        entity Books {
+          key ID : Integer;
+          title   : String;
+        }
+      }`
+    );
+    const openapi = toOpenApi(csn);
+    assert(openapi.servers[0].url.includes('odata/v4'));
+    assert(!openapi.servers[0].url.includes('rest'));
+  });
+
   test('options: Multiple servers', () => {
     const csn = cds.compile.to.csn(`
       service A {entity E { key ID : UUID; };};`

From db8cc224284dd8e79c3ba55255997f39be6628f1 Mon Sep 17 00:00:00 2001
From: Lukas Schwabe <lukas.schwabe@amag.ch>
Date: Fri, 21 Aug 2026 09:20:12 +0200
Subject: [PATCH 2/2] chore: adjust changelog.md to fit the fix

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4285a52..267c2a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 ### Deprecated
 ### Removed
 ### Fixed
+- set `odata` as the service protocol if no protocol is set to match the default behavior of `@sap/cds`
 ### Security
 
 ## [1.6.0] - 2026-08-04