# HTTP 504 response to all /xfdf/merge POST requests

**URL:** https://pdfjs.community/t/http-504-response-to-all-xfdf-merge-post-requests/1674
**Category:** Technical Support
**Created:** [May 12, 2022, 9:26am UTC](https://pdfjs.community/t/http-504-response-to-all-xfdf-merge-post-requests/1674 "2022-05-12T09:26:53Z")
**Posts on this page:** 1
**Showing post:** 3

<div class="post-metadata">

### Author: ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)
#### Post date: [May 12, 2022, 9:26am UTC](https://pdfjs.community/t/http-504-response-to-all-xfdf-merge-post-requests/1674/3 "2022-05-12T09:26:58Z")

</div>

**Hello, I’m Ron, an automated tech support bot 🤖**

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages:

Guides:
- [Merge & extract annotation in PDF.js Express - Getting started](https://pdfjs.express/documentation/annotation/merge-and-extract#getting-started)
- [Saving a document with annotations](https://pdfjs.express/documentation/basic-operations/save-document/save-with-annotations)
- [Config files](https://pdfjs.express/documentation/learn-more/advanced/config-files.8)

APIs:
- [ExpressUtils(optionsopt) - # async merge() → {Promise.}](https://pdfjs.express/api/utils/ExpressUtils.html#merge__anchor)
- [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor)
- [Chaining API calls](https://pdfjs.express/api/utils/tutorial-Chaining%20APIs.html#__anchor)

Forums:
- [Set password for generating pdf](https://pdfjs.community/t/set-password-for-generating-pdf/1346/1)
- [Load document by Url and save with watermark and html](https://pdfjs.community/t/load-document-by-url-and-save-with-watermark-and-html/502/1)
- [URGENT - Merge XFDF API giving [502] internal error](https://pdfjs.community/t/urgent-merge-xfdf-api-giving-502-internal-error/1092/1)

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