University of Tübingen

TueFind subject discovery services (ixTheo, RelBib, KrimDok)

Three national subject-information discovery services built and operated by Tübingen University Library on TueFind, the library's own VuFind derivative, whose source it develops in the open at https://github.com/ubtue/tuefind (PHP, actively committed as of 2026-09-01). ixTheo (Index Theologicus, ixtheo.de), RelBib (relbib.de) and KrimDok (krimdok.uni-tuebingen.de) are DFG-funded Fachinformationsdienste — the software, the hosting and the data curation are all the library's. VuFind exposes a /api/v1 search and record API, but as of 2026-09-01 all three hosts sit behind a SHA-256 proof-of-work browser-verification interstitial (17 leading zero bits, pow_token cookie, 1800s TTL) that answers 200 with an identical 2,148-byte challenge page for every path, including /api/v1/search. The challenge page is branded with the University of Tübingen and University Library logos, which confirms the operator. Recorded as a live but bot-challenged surface, not as a dead one, and NOT as a verified API contract — the challenge was not defeated. The VuFind contract would in any case be the product's.

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SourceCode
https://github.com/ubtue/tuefind

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API entry from apis.yml

apis.yml Raw ↑ 
aid: university-of-tubingen:tuefind-discovery
name: TueFind subject discovery services (ixTheo, RelBib, KrimDok)
x-operator: institution
description: Three national subject-information discovery services built and operated by Tübingen University
  Library on TueFind, the library's own VuFind derivative, whose source it develops in the open at https://github.com/ubtue/tuefind
  (PHP, actively committed as of 2026-09-01). ixTheo (Index Theologicus, ixtheo.de), RelBib (relbib.de)
  and KrimDok (krimdok.uni-tuebingen.de) are DFG-funded Fachinformationsdienste — the software, the hosting
  and the data curation are all the library's. VuFind exposes a /api/v1 search and record API, but as
  of 2026-09-01 all three hosts sit behind a SHA-256 proof-of-work browser-verification interstitial (17
  leading zero bits, pow_token cookie, 1800s TTL) that answers 200 with an identical 2,148-byte challenge
  page for every path, including /api/v1/search. The challenge page is branded with the University of
  Tübingen and University Library logos, which confirms the operator. Recorded as a live but bot-challenged
  surface, not as a dead one, and NOT as a verified API contract — the challenge was not defeated. The
  VuFind contract would in any case be the product's.
humanURL: https://ixtheo.de/
baseURL: https://ixtheo.de/api/v1
tags:
- Library
- Discovery
- VuFind
- TueFind
- Open Source
- Bot Challenge
properties:
- type: SourceCode
  url: https://github.com/ubtue/tuefind