Resolve "Accept xml and csv for pid"

Closes #232

Bitte anschauen @mstaudinger und falls ok mergen

Bitte nur anschauen @grantnert48

added priority::0 scope::Backend + 1 deleted label

requested review from @grantnert48

assigned to @mstaudinger

added status::Done label

changed target branch from master to dev

added 1 commit

• cca211d6 - Fixed the Accept header bug

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approved this merge request

mentioned in commit b41c479c

merged