Urihandler

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- Update backend + async workers (97)

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- URL parameters meegeven (92)

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- Onderscheid op accept header toelaten (86)

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- Drop python 2 support (80)
- Update to pyramid 2 (78)
- Update dependencies (77)
- Is setup.cfg still needed? (76)
- Drop pyup support (75)
- Which HTTP methods does the "redirect" route support? (73)

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- Py3 migratie (53)

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- Added http caching to the `/uris` endpoint.