When requesting an html artifact, the incorrect content-type is being returned. Looks like an issue with the s3 upload. This is only happening with recent builds. Older builds serve correctly from S3
example cURL response:
HTTP/1.1 200 OK
Cache-Control: max-age=31556926
Content-Encoding: gzip
Content-Type: binary/octet-stream
Date: Wed, 06 Sep 2017 04:35:15 GMT
Server: nginx
Set-Cookie: REDACTED
Strict-Transport-Security: max-age=15724800
X-CircleCI-Identity: REDACTED
Content-Length: 410
Connection: keep-alive