D11172: Explicitly set content type to form data

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R235 Attica

REVISION DETAIL
  https://phabricator.kde.org/D11172

To: leinir, #frameworks, apol
Cc: apol, #frameworks, michaelh