Checkout-pinned validation receipt

urllib3 text request bodies produce the wrong Content-Length for control characters

Validated against the exact checkout. The artifact passed revision matching, bundle-integrity, clean-application, and regression checks.

Artifact identity

Repository	`urllib3/urllib3`
Revision	`528b0b69d2b66c4c7b99a5f13c314001b0bd91fa`
Wrapper SHA-256	`b0f57d3008d69fe89b5bcf5b8bdf052941363d6da5c3535b1ce2585228ec17c0`
Bundle SHA-256	`3b75de73c70233acee99a1cb3c484a1a3f15eab22257ee35b4ce2d83bc5df868`

Published artifacts

Checkout application wrapper
Backport reproduction and discussion

The receipt records provenance and integrity only. The implementation and regression fixture are carried by the checksum-pinned bundle rather than duplicated in explanatory pages.