By devjk1
I am running into a Reason: CORS header ‘Access-Control-Allow-Origin’ missing, while uploading a file through my app. Is this error only caused by a misconfiguration of CORS? I believe I have set CORS correctly according to the CORS guide on DigitalOcean.
I have set the CORS Configuration as the guide states.
Origin: https://*.mydomain.website
Allowed Methods: all five methods
Max Age: 5
In my browser: https://mydomain.website/audios/create
Console error
OPTIONS
https://my-bucket.sfo3.digitaloceanspaces.com/audios/8a2caa034ff2225df2daafb2d441e63c6d4f4de41a411b6b3200b9017cc579cf
?x-amz-acl=public-read
&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD
&X-Amz-Algorithm=AWS4-HMAC-SHA256
&X-Amz-Credential=DO801MLCGYQT3V2WGZHN/20251111/us-east-1/s3/aws4_request
&X-Amz-Date=20251111T015924Z
&X-Amz-SignedHeaders=host;x-amz-acl
&X-Amz-Expires=300
&X-Amz-Signature=7363d0df0a7430661bdf1f8600e9977b71f608e052c21905313659bd711ec24c
Any help is greatly appreciated.
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
Heya, @devjk1
That error usually means your presigned URL is signed for the wrong region, not just a CORS issue.
You’re uploading to
https://my-bucket.sfo3.digitaloceanspaces.com
but the signature says
.../us-east-1/s3/aws4_request
That mismatch makes Spaces return a 403 with no CORS headers, so the browser shows “CORS header missing.”
You can regenerate the presigned URL using the correct region (sfo3) and endpoint. Example:
const s3 = new S3Client({
region: "sfo3",
endpoint: "https://sfo3.digitaloceanspaces.com",
});
Then check your CORS config — list exact origins (no wildcards), include PUT, GET, POST, DELETE, HEAD, and allow all headers (*).
Once the region and CORS rules match, the upload will work.
Hope that this helps!
Become a contributor for community
Get paid to write technical tutorials and select a tech-focused charity to receive a matching donation.
DigitalOcean Documentation
Full documentation for every DigitalOcean product.
Resources for startups and SMBs
The Wave has everything you need to know about building a business, from raising funding to marketing your product.
The developer cloud
Scale up as you grow — whether you're running one virtual machine or ten thousand.
Get started for free
Sign up and get $200 in credit for your first 60 days with DigitalOcean.*
*This promotional offer applies to new accounts only.