fix: send multipart encoding when using gcs_uri#278
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FastAPI requires multipart/form-data for endpoints with File()/Form() parameters. When gcs_uri is used without a file upload, requests defaulted to x-www-form-urlencoded, causing a 400 Bad Request. Fix: send a dummy empty file field to force multipart encoding. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Fix 400 Bad Request when using
gcs_uriparameter on the/separateendpoint.FastAPI requires
multipart/form-datafor endpoints withFile()/Form()params. Whengcs_uriwas used without a file upload, the requests library defaulted toapplication/x-www-form-urlencoded, which FastAPI rejected.Fix: send a dummy empty file field to force multipart encoding.
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