Adding Accept header causes application error #9247
Description
Expected Behavior
I'm creating a POST request which returns an SSE stream, I just want to see the raw SSE data.
Actual Behavior
When I add the Accept: text/event-stream header, there's an error:
Failed to render component.
Error: Could not determine key for item
at https://insomnia-app.local/assets/organization.sync-CW0bPsxC.js:24:63454
at Object.ys [as useMemo] (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:22:21361)
at r.useMemo (https://insomnia-app.local/assets/index-D9KPPwRz.js:9:6116)
at c3 (https://insomnia-app.local/assets/organization.sync-CW0bPsxC.js:24:63256)
at Mte (https://insomnia-app.local/assets/organization.sync-CW0bPsxC.js:24:65680)
at https://insomnia-app.local/assets/organization.sync-CW0bPsxC.js:24:65498
at Ou (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:22:16993)
at Rs (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:1576)
at ca (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:46101)
at ia (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:39823)
at uf (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:39751)
at vl (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:39605)
at ii (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:35968)
at ra (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:36778)
at zt (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:22:3258)
at sf (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:41342)
at Gt (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:40316)
at na (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:24:35769)
at We (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:9:1631)
at Immediate.jt [as _onImmediate] (https://insomnia-app.local/assets/chunk-T3VM44WY-C4_RtLh8.js:9:2022)
at process.processImmediate (node:internal/timers:485:21)
Reproduction Steps
- create new HTTP request
- fill in properties: URL, POST request, JSON body
- switch to Headers tab
- add
Acceptheader with valuetext/event-stream - error
Is there an existing issue for this?
- I have searched the issue tracker for this problem.
Which sync method do you use?
- Git sync.
- Insomnia Cloud sync.
- Local only
Additional Information
No response
Insomnia Version
Version: Insomnia 11.6.1 Build date: 9/18/2025 OS: Darwin arm64
What operating system are you using?
Windows
Operating System Version
macOS
Installation method
download from insomnia.rest
Last Known Working Insomnia version
No response