generated: '2026-08-19'
method: probed
source: https://ir.pku.edu.cn/oai/request?verb=BadVerb
x-operator: institution
format: html-error-page
rfc9457: false
note: >-
  The institutional repository has no error contract. Protocol-level and application-level
  failures both surface as Tomcat's default HTML 500 page with no machine-readable body,
  including in one case where the OAI-PMH 2.0 specification explicitly requires a
  structured error element. Everything below was observed on 2026-08-19, not inferred.
envelope:
  content_type: text/html
  schema: null
  example: 'HTTP Status 500 – Internal Server Error (Tomcat default page, ~3.6KB)'
status_codes:
  - status: 200
    meaning: >-
      Success. Also the correct OAI-PMH status for protocol errors, which should carry an
      <error code="..."> element — this repository does not do that.
    retryable: false
  - status: 500
    meaning: >-
      Returned for an unrecognised OAI-PMH verb, for GetRecord, and for /rest/items/{id}.
    retryable: false
observed:
  - request: 'GET https://ir.pku.edu.cn/oai/request?verb=BadVerb'
    status: 500
    expected: '200 with <error code="badVerb">, per OAI-PMH 2.0'
    note: Protocol violation. A conforming harvester cannot distinguish a bad request from an outage.
  - request: 'GET https://ir.pku.edu.cn/oai/request?verb=GetRecord&metadataPrefix=oai_dc'
    status: 500
    expected: '200 with <error code="badArgument">, the identifier argument being absent'
    note: Same violation on a mandatory verb.
  - request: 'GET https://ir.pku.edu.cn/rest/items/3'
    status: 500
    expected: 200 with the item
    note: >-
      A real defect, not a bad request — the same item resolves fine at
      /rest/handle/20.500.11897/69 and appears in /rest/items?limit=1. Item-by-numeric-id
      is broken while item-by-handle works.
  - request: 'GET https://idp.pku.edu.cn/idp/profile/Metadata/SAML'
    status: 500
    note: The Shibboleth metadata-generation profile errors; the static metadata at /idp/shibboleth serves fine.
  - request: 'GET https://idp.pku.edu.cn/idp/status'
    status: 403
    note: IdP status endpoint is access-controlled, which is the correct posture.