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README.md	2026-10-23	11.2 kB	0
v1.21.0 source code.tar.gz	2026-10-23	1.6 MB	0
v1.21.0 source code.zip	2026-10-23	1.8 MB	0
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v1.21.0 — October 21, 2026

This release adds response timing and opt-in UTF-8 Basic authentication, improves request handling across runtimes, and changes how header defaults are recognized.

⚠️ Breaking Changes & Deprecations

Header Defaults: Only plain objects, null-prototype maps, and compatible AxiosHeaders instances are treated as common or method-specific defaults; literal headers such as Link are now preserved. Applications using custom class instances as defaults must convert them to plain maps, for example { post: { ...customDefaults } }, or compatible AxiosHeaders. Otherwise, those instances become literal header values, including on requests using other methods. (#11156)

🚀 New Features

Response Timing: Added response.duration, in milliseconds, including on error.response when present. Timing measures adapter execution and excludes interceptors and transforms; streamed responses stop timing when the stream becomes available. Axios replaces any existing duration value supplied by a custom adapter. (#11214)
UTF-8 Basic Authentication: Added transitional.encodeBasicAuthUsername: true to support Unicode usernames in XHR and Fetch requests. The option defaults to false, preserving existing authentication behavior; applications opting in should supply the original Unicode username and remove manual pre-encoding workarounds. (#11159)

🐛 Bug Fixes

Fetch Compatibility: Restored requests in runtimes such as Cloudflare Workers that reject the implicit cache: 'default', while preserving explicit caller settings. Response-size failures now retain their original ERR_BAD_RESPONSE and request context when runtime wrappers replace the underlying stream error. (#11194, #11179)
Runtime Consistency: Aligned encoded-byte size accounting, multipart uploads, proxy routing, same-origin resolution, parameter merging, and form serialization across adapters. Circular parameters now reject with ERR_BAD_OPTION_VALUE, and sparse or non-index numeric form fields serialize as keyed objects. With proxy: false, native proxyEnv agents using unsupported pool-management or TLS-session lifecycle overrides now reject with ERR_BAD_OPTION_VALUE; construct those agents without proxyEnv. (#11242)
Header Handling: Preserved headers named __proto__ using safe casing without changing the AxiosHeaders instance prototype. Function matchers in has(), delete(), and clear() now receive the headers instance as this, matching their declared contract. (#11134, #11216)
URL and Data URL Parsing: Accepted case-insensitive supported URL schemes and Base64 markers, and corrected decoding of percent-encoded Base64 data URLs. Node data URL allocation estimates remain aligned with decoding so configured size limits apply before allocation. (#11138, #11163, #11294)
Error Diagnostics: Preserved short reconstructed request stacks and appended wrapped error stacks under Caused by: so tooling that reads only error.stack retains the original failure context. (#11132, #11142)
Interceptor Removal: Restored removal through canonical numeric-string interceptor IDs, including after registry compaction. (#11139)
Proxy TLS: HTTPS CONNECT tunnels now apply current origin TLS options from an explicit httpsAgent, or from https.globalAgent when no explicit agent is supplied. This preserves process-wide custom CA settings through proxy tunnels. (#11178)
XHR Lifecycle: Used asynchronous Cookie Store reads for XSRF tokens where supported, preserving cookie fallback, timeout accounting, and cancellation. Upload and download progress listeners are now removed on completion, failure, timeout, and cancellation. (#11166, #11225)
HTTP/2 Sessions: Stopped reusing sessions immediately after GOAWAY and prevented draining sessions from scheduling idle timers that could delay process exit. (#11210)
TypeScript Declarations: Exposed the response-default marker as a public type to resolve TS2527 when consumers emit declarations involving unresolved response generics, covering both ESM and CommonJS. (#11125)

🔧 Maintenance & Chores

Configuration Performance: Reduced request configuration merge overhead, particularly for requests with many headers, while preserving merge semantics and prototype-pollution guards. (#11208)
Same-Origin Checks: Removed obsolete Internet Explorer detection without changing origin decisions in supported environments. (#11174)
Dependencies: Updated follow-redirects to 1.16.1 and refreshed development, documentation, test, and GitHub Actions dependencies. Removed unused dayjs from the docs package, root chalk, and chai from CJS module tests. (#11169, #11188, #11189, #11195, #11212, #11213, #11218, #11220, #11221, #11230, #11234, #11244, #11245, #11266, #11267, #11268, #11269, #11270, #11271, #11272, #11298, #11302, #11303, #11304, #11305, #11306, #11313, #11321, #11322, #11323, #11342)
Documentation: Fixed interceptor test links, updated README CDN examples to the published 1.20.0 bundle, and corrected guidance on interceptor options and request lifecycle ordering. (#11228, #11149, #11335)
Contributor Workflow: Consolidated agent instructions in AGENTS.md, standardized PR labels, required prerelease notes and validation evidence, and clarified that npm test requires installed Playwright browsers. (#11238, #11273, #11223, #11284)
Sponsors and Support: Added HeroDevs, Code for Japan, and Sweepico sponsor listings, refreshed sponsor data, and documented extended security support for Axios v0. (#11222, #11249, #11252, #11341)
Proxy Regression Coverage: Added a long dotted request-hostname test for NO_PROXY handling, extending coverage of an existing denial-of-service fix. (#11235)
Release Preparation: Updated package version metadata for 1.21.0. (#11346)