Change Output header Content-Type to text/csv

[mahngiel]

Introduction

Currently, Output#output expects to render a CSV file, but does not set the correct Content-Type header.

Proposal

Describe the new/upated/fixed feature

Per RFC 7111, the content type is available text/csv.

Further, HTTP 1.1 7.2.1 states octet-stream should only be used when the content-type is uknown.

If and only if the media type is not given by a Content-Type field, the recipient MAY attempt to guess the media type via inspection of its content and/or the name extension(s) of the URI used to identify the resource. If the media type remains unknown, the recipient SHOULD treat it as type "application/octet-stream".

Output#output sets Content-Type as text/csv

Backward Incompatible Changes

None

Targeted release version

8.1.1

PR Impact

None observed

Open issues

None

[nyamsprod]

@mahngiel
Could you submit the CONTRIB changes in another PR please as these changes should be decoupled with the current PR ?

[mahngiel]

@nyamsprod done. see #176