Adding Accept header causes application error

[mhr3]

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 Accept header with value text/event-stream
• error

Is there an existing issue for this?

• [x] I have searched the issue tracker for this problem.

Which sync method do you use?

• [ ] Git sync.
• [ ] Insomnia Cloud sync.
• [x] 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

[notjaywu]

You can try adding an sse request directly and set the method to POST.

[mhr3]

That indeed works, thank you.

Would be still nice if it didn't crash doing it the other way.