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The @fortaine/fetch-event-source library only sets Accept: text/event-stream
when no Accept header is provided by the caller. However, getHeaders() sets
Accept: application/json, which takes precedence and can cause some servers
or proxies to return a non-SSE response. When the response content-type does
not match text/event-stream, the onopen error handler reads the entire raw
response body (including all data: {...} SSE lines) and displays it as the
chat message, resulting in garbled output on iOS Safari and other clients.
Fix by explicitly setting Accept: text/event-stream in the chatPayload
headers for both stream() and streamWithThink(), overriding the generic
application/json Accept header for SSE streaming connections.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes #6665
Summary
This PR fixes: [Bug]
Changes
Testing
Please review the changes carefully. The fix was verified against the existing test suite.
This PR was created with the assistance of Claude Sonnet 4.6 by Anthropic | effort: low. Happy to make any adjustments!