fixes for automate (#5127)

# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

app/core/src/main/java/stirling/software/SPDF/controller/web/ReactRoutingController.java

@@ -4,6 +4,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.StandardCharsets;
 
+import jakarta.annotation.PostConstruct;
+
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.http.MediaType;
@@ -19,9 +21,25 @@ public class ReactRoutingController {
     @Value("${server.servlet.context-path:/}")
     private String contextPath;
 
-    @GetMapping(value = {"/", "/index.html"}, produces = MediaType.TEXT_HTML_VALUE)
-    public ResponseEntity<String> serveIndexHtml(HttpServletRequest request)
-            throws IOException {
+    private String cachedIndexHtml;
+    private boolean indexHtmlExists = false;
+
+    @PostConstruct
+    public void init() {
+        // Only cache if index.html exists (production builds)
+        ClassPathResource resource = new ClassPathResource("static/index.html");
+        if (resource.exists()) {
+            try {
+                this.cachedIndexHtml = processIndexHtml();
+                this.indexHtmlExists = true;
+            } catch (IOException e) {
+                // Failed to cache, will process on each request
+                this.indexHtmlExists = false;
+            }
+        }
+    }
+
+    private String processIndexHtml() throws IOException {
         ClassPathResource resource = new ClassPathResource("static/index.html");
 
         try (InputStream inputStream = resource.getInputStream()) {
@@ -41,10 +59,20 @@ public class ReactRoutingController {
                     "<script>window.STIRLING_PDF_API_BASE_URL = '" + baseUrl + "';</script>";
             html = html.replace("</head>", contextPathScript + "</head>");
 
-            return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(html);
+            return html;
         }
     }
 
+    @GetMapping(value = {"/", "/index.html"}, produces = MediaType.TEXT_HTML_VALUE)
+    public ResponseEntity<String> serveIndexHtml(HttpServletRequest request)
+            throws IOException {
+        if (indexHtmlExists && cachedIndexHtml != null) {
+            return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(cachedIndexHtml);
+        }
+        // Fallback: process on each request (dev mode or cache failed)
+        return ResponseEntity.ok().contentType(MediaType.TEXT_HTML).body(processIndexHtml());
+    }
+
     @GetMapping(
             "/{path:^(?!api|static|robots\\.txt|favicon\\.ico|manifest.*\\.json|pipeline|pdfjs|pdfjs-legacy|fonts|images|files|css|js|assets|locales|modern-logo|classic-logo|Login|og_images|samples)[^\\.]*$}")
     public ResponseEntity<String> forwardRootPaths(HttpServletRequest request)

frontend/src/core/utils/automationExecutor.ts

@@ -1,4 +1,4 @@
-import axios from 'axios';
+import apiClient from '@app/services/apiClient';
 import { ToolRegistry } from '@app/data/toolsTaxonomy';
 import { ToolId } from '@app/types/toolId';
 import { AUTOMATION_CONSTANTS } from '@app/constants/automation';
@@ -58,7 +58,7 @@ const executeApiRequest = async (
   filePrefix: string,
   preserveBackendFilename?: boolean
 ): Promise<File[]> => {
-  const response = await axios.post(endpoint, formData, {
+  const response = await apiClient.post(endpoint, formData, {
     responseType: 'blob',
     timeout: AUTOMATION_CONSTANTS.OPERATION_TIMEOUT
   });