SVG images are served with wrong MIME type

[edgar-bonet]

• Gogs version (or commit ref): 0.11.18.0608, 0.11.19.0609, 0.11.21.0611 (on try.gogs.io)
• Git version: 2.7.4
• Operating system: Ubuntu 16.04
• Database:
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gogs.io:
  • Yes: https://try.gogs.io/edgar/test-svg-mime
  • No
  • Not relevant
• Log gist (usually found in log/gogs.log): N/A

Description

Embedding SVG images in a repo's README.md does nor work. Instead of the image, the alt text is displayed in the browser (both Firefox and Chromium).

See the test case at try.gogs.io.

The generated HTML is fine. The problem stems from the fact that Gogs serves the SVG file with the HTTP header

Content-Type: text/plain; charset=utf-8

whereas the correct type is image/svg+xml.

[edgar-bonet]

The issue had been previously reported on the Gitea bug tracker.