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API Problem+JSON — Forbidden (403)

RFC 7807 SAMPLE problem document for HTTP 403 (Forbidden) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Gone (410)

RFC 7807 SAMPLE problem document for HTTP 410 (Gone) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Internal Server Error (500)

RFC 7807 SAMPLE problem document for HTTP 500 (Internal Server Error) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Not Acceptable (406)

RFC 7807 SAMPLE problem document for HTTP 406 (Not Acceptable) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Not Found (404)

RFC 7807 SAMPLE problem document for HTTP 404 (Not Found) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Service Unavailable (503)

RFC 7807 SAMPLE problem document for HTTP 503 (Service Unavailable) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Too Many Requests (429)

RFC 7807 SAMPLE problem document for HTTP 429 (Too Many Requests) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Unauthorized (401)

RFC 7807 SAMPLE problem document for HTTP 401 (Unauthorized) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Unprocessable Entity (422)

RFC 7807 SAMPLE problem document for HTTP 422 (Unprocessable Entity) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

API Problem+JSON — Unsupported Media Type (415)

RFC 7807 SAMPLE problem document for HTTP 415 (Unsupported Media Type) client tests.

File: JSON · Api
Use case: JSON parsingError handling+1· Conversion set

Api Rate Limit Meta

Rate-limit header values captured as JSON for middleware testing.

File: JSON · Api
Use case: API testingJSON parsing

API Response — Users Page 1 (JSON)

Page 1 of a paginated JSON API response (users), with page metadata and a `hasMore` flag. Paired with page 2 for testing pagination and infinite-scroll logic.

File: JSON · Api
Use case: API testingConversion testing· Conversion set

API Response — Users Page 2 (JSON)

Page 2 (the final page) of a paginated JSON API response. Paired with page 1 for testing pagination, `hasMore` handling, and list merging.

File: JSON · Api
Use case: API testingConversion testing· Conversion set

Api Total Count Mismatch

Paginated response where total count disagrees with items length — tests inconsistency detection.

File: JSON · Api
Use case: API testingJSON parsing

APNG — Animated Spinner

A 12-frame animated PNG (APNG) of a rotating arc — a lossless, alpha-capable alternative to animated GIF. Useful for testing APNG support, frame extraction, and GIF↔APNG conversion.

File: APNG · Raster Formats · 128 × 128 px
Use case: Conversion testing

App Config (INI)

Sample INI config file for legacy config parser tests.

File: INI · Config
Use case: Config testingConversion testing

App Config (TOML)

Sample TOML application config for TOML parser tests.

File: TOML · Config
Use case: Config testingConversion testing

App Settings (JSON)

JSON application settings for config-merge and validation tests.

File: JSON · Config
Use case: Config testingConversion testing+1

Apple — Ground-Truth Alpha Mask (512px)

The binary ground-truth alpha mask (white = subject, black = background) for the cluttered-background apple — compute IoU or boundary F-score of a predicted mask against this file.

File: PNG · Background Removal · 512 × 512 px
Use case: Background removalImage segmentation· Conversion set

Apple — Ground-Truth Cut-out (512px)

The ground-truth transparent cut-out of the apple used in the cluttered-background hard case — the ideal output of a perfect background remover.

File: PNG · Background Removal · 512 × 512 px
Use case: Background removalImage segmentation· Conversion set

Apple .strings — English

An Apple Localizable.strings file (English) — quoted key = value pairs with comments and %@ placeholders, as iOS/macOS apps use per-locale in .lproj folders.

File: STRINGS · Apple · en
Use case: Localization catalogsInternationalization+1· Conversion set

Apple .strings — positional arguments that reorder (German)

A German .strings file whose replace_confirm value puts %2$@ before %1$@, because German inverts the pair English uses. Also covers %% as a literal percent, an escaped double quote, a doubled-backslash UNC path and an escaped newline inside a value.

File: STRINGS · Apple · UTF-8
Use case: InternationalizationLocalization catalogs· Conversion set

Apple .strings — Spanish

The Spanish twin of the Apple .strings catalog — for testing .strings parsers and en/es diffing against the same keys.

File: STRINGS · Apple · es
Use case: Localization catalogsInternationalization+1· Conversion set

Apple .strings — UTF-16 LE with BOM (Japanese)

The encoding fixture the .strings format needs: a Japanese catalog written as UTF-16 Little Endian with a byte-order mark, which is what Xcode has historically produced and what a UTF-8-only reader turns into mojibake or a decode error. Also carries full-width punctuation and an ideographic space for width and line-breaking tests.

File: STRINGS · Apple · UTF-16 LE
Use case: InternationalizationEncoding detection+1· Conversion set