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API-3019: Java SDK uploads fail with the split on (chunks are posted to the portal root, not the BFG endpoint) - #160
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…point The Amazon S3 chunk upload declared @post("/"), which Retrofit resolves as an absolute path and therefore discards the path component of the base URL returned by getClosestS3Endpoint(). When that endpoint is served behind a path (e.g. .../api/1/boss/v4upload/), chunks were posted to the host root instead, resulting in a 413 Request Entity Too Large from the proxy. Use @post(".") so the request resolves against the full base URL, preserving its path. Bucket-root S3 endpoints (path "/") resolve identically, so this is backwards compatible. Also pin the S3 upload client to HTTP/1.1 to avoid the intermittent StreamResetException (NO_ERROR) seen with S3 over HTTP/2 on multipart part uploads. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
thegreatdeku
approved these changes
Oct 14, 2026
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When bfg is enabled, the upload endpoint format changes. This breaks uploads due to the new upload endpoint containing multiple
/characters.