Bad Content-Type with ELB

[profy12]

If using this layer with an ELB, http header Content-Type is set to application/octet-stream instead of text/html; charset=UTF-8.

Bug or feature ? How can I change it ?

[emycakes]

can confirm I am also experiencing this issue without an ability to change it

[daftspunk]

To solve this issue, enable Multi value headers in AWS:

1. Open AWS console
2. Navigate to EC2 > Load Balancing > Target Groups
3. Select relevant Target Group
4. Click Edit under Attributes
5. Set Multi value headers to Enabled

The proper headers should return now