axios/PRE_RELEASE_CHANGELOG.md

Pre-Release Changelog

Unreleased

New Features

• HTTP Adapter - Zstandard: Added automatic zstd decompression on Node.js versions that support it. zstd is only advertised in the default Accept-Encoding header when transitional.advertiseZstdAcceptEncoding: true is set. (#6792)

Bug Fixes

• AxiosHeaders: Silently skip empty response header names emitted by some React Native Android responses instead of throwing. (#6959, #10875)
• Config Security: Ignore inherited params and paramsSerializer values when resolving request config, preventing prototype-pollution gadgets from changing serialized URLs. (#10922)
• Types: Add the missing readonly name: 'CanceledError' declaration to CommonJS CanceledError typings to match the ESM declarations. (#10922)
• Types: Correct the CommonJS isCancel type guard to narrow cancellation errors to CanceledError<T>, matching the ESM declaration. (#10952)
• HTTP Adapter - Auth on Redirect: HTTP Basic credentials supplied via config.auth are now restored on same-origin redirects, fixing a regression caused by follow-redirects >= 1.15.8 that broke POST requests answered with a 303 Location. Cross-origin redirects continue to drop credentials, preserving the existing T-R2 mitigation in THREATMODEL.md. (#6929)
• HTTP Adapter - Proxy TLS: Preserve httpsAgent TLS options such as ca and rejectUnauthorized for HTTPS origins reached through a CONNECT proxy tunnel. (#10953)
• HTTP Adapter - Socket Path: Ignore inherited socketPath and allowedSocketPaths config values when building Node.js requests, preventing prototype-pollution SSRF via Unix sockets. (#10901)
• React Native FormData: Clear the default Content-Type header for React Native FormData requests so Android can build multipart bodies with the correct boundary. (#10898)
• Request Data: Preserve enumerable symbol keys when merging plain request data before transformRequest. (#6392)

Release Documentation TODO

• Update README.md request config docs for transitional.advertiseZstdAcceptEncoding and zstd decompression support.
• Update docs/pages/advanced/request-config.md for transitional.advertiseZstdAcceptEncoding and zstd decompression support.
• Update decompression-bomb security guidance in README.md and docs/pages/misc/security.md to mention zstd.