# mitmproxy v12.1.0 — mitmproxy 12.1.0

- Product: mitmproxy (https://whatsnew.fyi/product/mitmproxy)
- Vendor: mitmproxy
- Date: 2025-05-24
- Version: v12.1.0
- Original notes: https://github.com/mitmproxy/mitmproxy/releases/tag/v12.1.0
- Permalink: https://whatsnew.fyi/product/mitmproxy/releases/v12.1.0
- Labels: Platforms: Desktop

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — mitmweb now supports filtering by body contents using ~b, ~bq, and ~bs filters
- **fixed** — Fix raw response export incorrectly zeroing non-zero Content-Length header for HEAD requests
- **fixed** — Fix concurrent mitmweb instances overwrite each other's auth cookie

- mitmweb now supports filtering by body contents (~b, ~bq, ~bs).
  ([#7704](https://github.com/mitmproxy/mitmproxy/pull/7704), @lups2000, @mhils)
- Fix raw response export incorrectly zeroing non-zero `Content-Length` header for HEAD requests.
  ([#7701](https://github.com/mitmproxy/mitmproxy/pull/7701), @sujaldev)
- Fix concurrent mitmweb instances overwrite each other's auth cookie.
  ([#7690](https://github.com/mitmproxy/mitmproxy/pull/7690), @turboOrange)