# S3 CDN URL ignored when uploading into posts
**URL:** https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898
**Category:** Bug
**Created:** [December 28, 2016, 6:31pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898 "2016-12-28T18:31:44Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@DanielMarquard](https://meta.discourse.org/u/DanielMarquard)
#### Post date: [December 28, 2016, 6:31pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/1 "2016-12-28T18:31:44Z")
All of our traffic goes through CloudFront, and static content is fetched by CloudFront from one of several S3 buckets.
With uploads being sent to S3, Discourse embeds the content with a generic bucket URL despite our having `s3 cdn url` set. Once submitted, posts appear to use the correct URL set in `s3 cdn url`, although this may also be because we have `DISCOURSE_CDN_URL` set as well (both are set to the same URL).
The post preview window references the standard S3 URL seen in the unbaked post, though. This is a problem because we use a private ACL on files uploaded to our Discourse uploads bucket, as content on this bucket should never be accessed outside of CloudFront. The result is a broken image in the preview window.
---
### Author:  [@timkelty](https://meta.discourse.org/u/timkelty)
#### Post date: [October 9, 2019, 3:58pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/2 "2019-10-09T15:58:21Z")
Disappointing this has been reported for so many years with no fix.
@DanielMarquard Did you ever figure out a workaround, or were you forced to make your s3 ACL public?
---
### Author:  [@Stephen](https://meta.discourse.org/u/Stephen)
#### Post date: [October 9, 2019, 4:02pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/3 "2019-10-09T16:02:36Z")
I’m not sure it’s fair to suggest this is broken, as much as the more complicated implementation isn’t fully supported.
S3 uploads as documented work and behave correctly.
---
### Author:  [@timkelty](https://meta.discourse.org/u/timkelty)
#### Post date: [October 9, 2019, 4:07pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/4 "2019-10-09T16:07:06Z")
@Stephen Certainly up for interpretation…
To me it seems “broken” that it uses the CDN url in one instance and not the other, and it forces an S3 configuration that AWS actually recommends against (public ACL for an s3 bucket).
I’m new to the Discourse project in general, but can certainly work on a PR.
---
### Author:  [@riking](https://meta.discourse.org/u/riking)
#### Post date: [October 9, 2019, 4:59pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/5 "2019-10-09T16:59:24Z")
This may be worth fixing now - AWS is getting more serious about informing people of public read ACLs.
---
### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [October 14, 2019, 12:24am UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/6 "2019-10-14T00:24:58Z")
Given our current implementation no longer has an IMG tag eg:
``
It should be quite easy to apply a CDN to the above and it saves traffic.
@vinothkannans can you fix this up so preview uses the CDN url
Instead of preview showing:
```plaintext
```
We should show the CDN URL which is this:
```plaintext
```
---
### Author:  [@vinothkannans](https://meta.discourse.org/u/vinothkannans)
#### Post date: [October 14, 2019, 3:40am UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/8 "2019-10-14T03:40:02Z")
Now it’s fixed as per the below commit
[https://github.com/discourse/discourse/commit/e4fe864c0b7d4d5d1f0cd604829eca81b71bb4ec](https://github.com/discourse/discourse/commit/e4fe864c0b7d4d5d1f0cd604829eca81b71bb4ec)
---
### Author:  [@vinothkannans](https://meta.discourse.org/u/vinothkannans)
#### Post date: [October 15, 2019, 12:30pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/9 "2019-10-15T12:30:10Z")
This topic was automatically closed after 32 hours. New replies are no longer allowed.
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [June 29, 2020, 8:08pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/10 "2020-06-29T20:08:48Z")
---
### Author:  [@RGJ](https://meta.discourse.org/u/RGJ)
#### Post date: [June 29, 2020, 3:01pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/11 "2020-06-29T15:01:58Z")
Continuing the discussion from [S3 CDN URL ignored when uploading into posts](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/8):
It seems like this issue has regressed, I can repro here on meta.
---
### Author:  [@codinghorror](https://meta.discourse.org/u/codinghorror)
#### Post date: [June 29, 2020, 8:09pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/12 "2020-06-29T20:09:14Z")
Can we check this @vinothkannans or @falco?
---
### Author:  [@vinothkannans](https://meta.discourse.org/u/vinothkannans)
#### Post date: [July 2, 2020, 1:11am UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/14 "2020-07-02T01:11:53Z")
As per the recent change, we’re now getting the uploaded file’s URL from the initial upload request itself. Previously, we received it from the `/uploads/lookup-urls.json` endpoint. This commit should fix the issue.
[https://github.com/discourse/discourse/commit/f11363d446c4c6a01a59d192f5f078c813ed1919](https://github.com/discourse/discourse/commit/f11363d446c4c6a01a59d192f5f078c813ed1919)
---
### Author:  [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [August 4, 2020, 4:39pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/15 "2020-08-04T16:39:43Z")
Looks like this fix [doesn’t cover custom emoji](https://meta.discourse.org/t/custom-emoji-dont-use-cdn-for-s3-stored-assets/159787/5) in the preview, for example :allthethings:.
---
### Author:  [@applebee1558](https://meta.discourse.org/u/applebee1558)
#### Post date: [November 10, 2020, 4:28pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/16 "2020-11-10T16:28:31Z")
This is also missing attachments like data exports or just any file attachment. Those still come from s3.
---
### Author:  [@nbianca](https://meta.discourse.org/u/nbianca)
#### Post date: [December 3, 2020, 12:18pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/18 "2020-12-03T12:18:09Z")
I can fix that!
[https://github.com/discourse/discourse/pull/11401](https://github.com/discourse/discourse/pull/11401)
---
### Author:  [@nbianca](https://meta.discourse.org/u/nbianca)
#### Post date: [December 9, 2020, 7:05pm UTC](https://meta.discourse.org/t/s3-cdn-url-ignored-when-uploading-into-posts/54898/19 "2020-12-09T19:05:31Z")
```
We should show the CDN URL which is this:
```plaintext