DEVELOPER GUIDES
Test the response your integration gets wrong.
Troubleshoot a specific wire-level problem, reproduce it with a selected synthetic response, then assert what your client should do.
These guides separate provider contracts, NotTheRealAPI fixtures and client policy. They do not require a live provider account or run requests from this website.
Dataverse 204 No Content and OData identity handling
Accept an empty successful response, keep its row identity, and test throttling and precondition failures separately.
Related Dataverse Accounts mock API referenceOpenAI Responses streaming errors and early EOF
Keep partial text separate from a completed answer, and reproduce an explicit stream error or a silent early end.
Related OpenAI Responses mock API reference
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Browse the mock API catalogue for supported operations, selected outcomes and fidelity labels. The guides cover individual integration problems; the provider references describe the available test surface.