Use `default_type` instead of `add_header Content-Type`

The latter can cause duplicate Content-Type headers. Thanks to strcat for notifying me of the issue.

added 15 commits

• 371a4f49...d5cea72f - 14 commits from branch master
• 8c1c7de4 - Use `default_type` instead of `add_header Content-Type`

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approved this merge request

added 2 commits

• f3be425a - 1 commit from branch master
• c846e43f - Use `default_type` instead of `add_header Content-Type`

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enabled an automatic merge when the pipeline for c846e43f succeeds

merged

mentioned in commit 264143ba