🔗 fix: Provided Azure Base URL Construction for Responses API (#10289)

* fix: response api works with azure base url configured

* add unit test

---------

Co-authored-by: Peter Rothlaender <peter.rothlaender@ginkgo.com>

packages/api/src/endpoints/openai/config.spec.ts

@@ -737,6 +737,27 @@ describe('getOpenAIConfig', () => {
       ).toBeUndefined();
     });
 
+    it('should create correct Azure baseURL when response api is selected', () => {
+      const azure = {
+        azureOpenAIApiInstanceName: 'test-instance',
+        azureOpenAIApiDeploymentName: 'test-deployment',
+        azureOpenAIApiVersion: '2023-08-15',
+        azureOpenAIApiKey: 'azure-key',
+      };
+
+      const result = getOpenAIConfig(mockApiKey, {
+        azure,
+        modelOptions: { useResponsesApi: true },
+        reverseProxyUrl:
+          'https://${INSTANCE_NAME}.openai.azure.com/openai/deployments/${DEPLOYMENT_NAME}',
+      });
+
+      expect(result.configOptions?.baseURL).toBe(
+        'https://test-instance.openai.azure.com/openai/v1',
+      );
+      expect(result.configOptions?.baseURL).not.toContain('deployments');
+    });
+
     it('should handle Azure with organization from environment', () => {
       const originalOrg = process.env.OPENAI_ORGANIZATION;
       process.env.OPENAI_ORGANIZATION = 'test-org-123';

packages/api/src/endpoints/openai/config.ts

@@ -113,8 +113,10 @@ export function getOpenAIConfig(
         return;
       }
 
+      const updatedUrl = configOptions.baseURL?.replace(/\/deployments(?:\/.*)?$/, '/v1');
+
       configOptions.baseURL = constructAzureURL({
-        baseURL: configOptions.baseURL || 'https://${INSTANCE_NAME}.openai.azure.com/openai/v1',
+        baseURL: updatedUrl || 'https://${INSTANCE_NAME}.openai.azure.com/openai/v1',
         azureOptions: azure,
       });