# CORS issue correspondence

**URL:** <https://pdfjs.community/t/cors-issue-correspondence/878>\
**Category:** Technical Support\
**Created:** [July 9, 2021, 6:06am UTC](https://pdfjs.community/t/cors-issue-correspondence/878 "2021-07-09T06:06:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![chats2790](https://avatars.discourse-cdn.com/v4/letter/c/34f0e0/32.png) [@chats2790](https://pdfjs.community/u/chats2790)\
**Post date:** [July 9, 2021, 6:06am UTC](https://pdfjs.community/t/cors-issue-correspondence/878/1 "2021-07-09T06:06:49Z")

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**PDF.js Express Version**  
7.3.3

**Detailed description of issue**  
Hi team ,  
We have been getting CORS error issue on loading our viewer with an s3 url link. The get api is sent your pdfjs server to S3 for fetching the url. Is this an issue on your end ? Can u pls confirm?

**Expected behaviour**  
{Provide a screenshot or description of the expected behaviour}

**Does your issue happen with every document, or just one?**  
{Answer here}

**Link to document**  
{Provide a link to the document in question if possible}

**Code snippet**  
{Provide a relevant code snippet}

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<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:** [July 9, 2021, 6:06am UTC](https://pdfjs.community/t/cors-issue-correspondence/878/2 "2021-07-09T06:06:53Z")

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**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:
- [Framework compatibility for PDF.js Express - Call APIs](https://pdfjs.express/documentation/learn-more/framework-compatibility#call-apis)
- [Electron PDF.js Viewer](https://pdfjs.express/documentation/electron)
- [React PDF.js Viewer](https://pdfjs.express/documentation/react)

APIs:
- [WebViewerInstance.Popup](https://pdfjs.express/api/WebViewerInstance.Popup.html#__anchor)
- [WebViewerInstance.Hotkeys](https://pdfjs.express/api/WebViewerInstance.Hotkeys.html#__anchor)
- [WebViewerInstance.MenuOverlay](https://pdfjs.express/api/WebViewerInstance.MenuOverlay.html#__anchor)

Forums:
- [Pdf js viewer throwing error on Firefox](https://pdfjs.community/t/pdf-js-viewer-throwing-error-on-firefox/429/1)
- [Issue with importing radio buttons in pdf](https://pdfjs.community/t/issue-with-importing-radio-buttons-in-pdf/821/1)
- [TypeError: Cannot read property ‘nativeElement’ of undefined](https://pdfjs.community/t/typeerror-cannot-read-property-nativeelement-of-undefined/329/1)

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<div class="post-metadata">

**Author:** ![Logan](https://yyz1.discourse-cdn.com/flex031/user_avatar/pdfjs.community/logan/32/13_2.png) [@Logan](https://pdfjs.community/u/Logan)\
**Post date:** [July 12, 2021, 2:35pm UTC](https://pdfjs.community/t/cors-issue-correspondence/878/3 "2021-07-12T14:35:32Z")

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Hi there,

This is not enough information for us to help. Can you please send a code sample as well as the errors you are receiving.

Thanks,  
Logan