Bynder / bynder-java-sdk / 35789245541

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API-2971: fix socket timeout and OOM on large file uploads

- Thread HttpConnectionSettings through the Amazon S3 upload client
  (ApiFactory, AmazonS3Service/Impl, FileUploader, AssetService/Impl,
  BynderClientImpl) so upload timeouts are configurable instead of
  silently defaulting to OkHttp's hardcoded 10s connect/read/write
  timeouts, which caused SocketTimeoutException on large file uploads.
- Fix RXUtils.mapWithIndex to pair chunks with their index via a lazy
  map instead of zipWith(Observable.range(...)), which greedily drained
  the entire file into memory before any chunk was uploaded, causing an
  OutOfMemoryError on multi-gigabyte files.
- Switch FileUploader's chunk upload from flatMapSingle to
  concatMapSingle to process chunks strictly one at a time.
- Update HttpConnectionSettingsTest to match the new default timeout.
- Update OAuthClientCredentialsSample with the fixed timeout config and
  an additional uploadFile() example.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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