Refactor: Extract OIDC endpoint fetching to reusable method

Extract the logic for fetching OIDC endpoints from the well-known endpoint
into a helper method fetchOidcEndpointsFromWellKnown(). This method is now
reused for both the Azure client secret authentication case and the default
case, reducing code duplication.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: hectorcast-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/DatabricksConfig.java

@@ -787,6 +787,21 @@ private OpenIDConnectEndpoints getUnifiedOidcEndpoints(String accountId) throws
     return new OpenIDConnectEndpoints(prefix + "/v1/token", prefix + "/v1/authorize");
   }
 
+  private OpenIDConnectEndpoints fetchOidcEndpointsFromWellKnown() throws IOException {
+    ApiClient apiClient =
+        new ApiClient.Builder()
+            .withHttpClient(getHttpClient())
+            .withGetHostFunc(v -> getHost())
+            .build();
+    try {
+      return apiClient.execute(
+          new Request("GET", "/oidc/.well-known/oauth-authorization-server"),
+          OpenIDConnectEndpoints.class);
+    } catch (IOException e) {
+      throw new DatabricksException("IO error: " + e.getMessage(), e);
+    }
+  }
+
   private OpenIDConnectEndpoints fetchDefaultOidcEndpoints() throws IOException {
     if (getHost() == null) {
       return null;
@@ -798,33 +813,14 @@ private OpenIDConnectEndpoints fetchDefaultOidcEndpoints() throws IOException {
     }
 
     if (isAzure() && getAzureClientId() != null) {
-      Request request = new Request("GET", getHost() + "/oidc/oauth2/v2.0/authorize");
-      request.setRedirectionBehavior(false);
-      Response resp = getHttpClient().execute(request);
-      String realAuthUrl = resp.getFirstHeader("location");
-      if (realAuthUrl == null) {
-        return null;
-      }
-      return new OpenIDConnectEndpoints(
-          realAuthUrl.replaceAll("/authorize", "/token"), realAuthUrl);
+      return fetchOidcEndpointsFromWellKnown();
     }
     if (isAccountClient() && getAccountId() != null) {
       String prefix = getHost() + "/oidc/accounts/" + getAccountId();
       return new OpenIDConnectEndpoints(prefix + "/v1/token", prefix + "/v1/authorize");
     }
 
-    ApiClient apiClient =
-        new ApiClient.Builder()
-            .withHttpClient(getHttpClient())
-            .withGetHostFunc(v -> getHost())
-            .build();
-    try {
-      return apiClient.execute(
-          new Request("GET", "/oidc/.well-known/oauth-authorization-server"),
-          OpenIDConnectEndpoints.class);
-    } catch (IOException e) {
-      throw new DatabricksException("IO error: " + e.getMessage(), e);
-    }
+    return fetchOidcEndpointsFromWellKnown();
   }
 
   @Override