# loadDocument HEAD calls **URL:** \ **Category:** Technical Support\ **Tags:** pdfjs-express\ **Created:** [May 30, 2022, 5:32am UTC](https://pdfjs.community/t/loaddocument-head-calls/1720 "2022-05-30T05:32:23Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/pdfjscommunity/original/1X/ffbcd25c7d423db8d5acd5db201c272f4db306dd.png) [@system](https://pdfjs.community/u/system)\ **Post date:** [May 30, 2022, 5:32am UTC](https://pdfjs.community/t/loaddocument-head-calls/1720/3 "2022-05-30T05:32:28Z")
**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: - [Events for PDF.js Express - Document loading](https://pdfjs.express/documentation/learn-more/events.8#document-loading) - [PDF.js Express Viewer APIs](https://pdfjs.express/documentation/viewer/api) - [Open a document, add annotations, download - 2. Listen for document load](https://pdfjs.express/documentation/use-case/upload-download.8#2.-listen-for-document-load) APIs: - [Core.DocumentViewer - setWatermark(options)](https://pdfjs.express/api/Core.DocumentViewer.html#setWatermark__anchor) - [PDF.js Express Utilities](https://pdfjs.express/api/utils/index.html#__anchor) - [Core.Document - enableColorSeparations(options)](https://pdfjs.express/api/Core.Document.html#enableColorSeparations__anchor) Forums: - [Pdfjs.express watermark despite licence key & correct domain](https://pdfjs.community/t/pdfjs-express-watermark-despite-licence-key-correct-domain/1592/1) - [Error 504 trying to merge xfdf - Urgent](https://pdfjs.community/t/error-504-trying-to-merge-xfdf-urgent/1691/1) - [Error when loading xfdf annotations](https://pdfjs.community/t/error-when-loading-xfdf-annotations/1380/1) --- _[View the full topic](https://pdfjs.community/t/loaddocument-head-calls/1720)._