A Claude Code environment variable, read out of the shipped bundle.
It has been in the build since v2.1.239, including the newest one read.
Set to 1 to stop Claude Code from treating an Amazon Bedrock streaming response with a missing or empty Content-Type header as Amazon Bedrock's binary event stream. By default, Claude Code assumes a gateway dropped the header from an otherwise unmodified response, so it decodes the body and streaming keeps working. Set this only for a gateway that also re-emits the stream as server-sent events; Claude Code then reads the header-less body as server-sent events instead. Requires Claude Code v2.1.239 or later
Bedrock streaming replies missing a content-type now work, and a new env var restores the old strict check.
named in this entry, found in this entry's text
First cited
1
The earliest release whose published evidence quoted CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_DEFAULT was v2.1.239, 21 Aug 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
ReleaseDateThe span that was quoted
v2.1.23921 Aug 2026CLAUDE_CODE_DISABLE_BEDROCK_CONTENT_TYPE_DEFAULT
Presence across releases
1
BuildsHow manyDatesReading
v2.1.239 – v2.1.30859 builds21 Aug 2026 → 22 Oct 2026 ◆in the build
Build by build
59
One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
v2.1.29914 Oct 2026·presentverdict: present · bool
v2.1.30014 Oct 2026·presentverdict: present · bool
v2.1.30115 Oct 2026·presentverdict: present · bool
v2.1.30216 Oct 2026·presentverdict: present · bool
v2.1.30318 Oct 2026·presentverdict: present · bool
v2.1.30419 Oct 2026·presentverdict: present · bool
v2.1.30520 Oct 2026·presentverdict: present · bool
v2.1.30621 Oct 2026·presentverdict: present · bool
v2.1.30721 Oct 2026·presentverdict: present · bool
v2.1.30822 Oct 2026·presentverdict: present · bool
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.
