fix: prevent writing after response headers are sent - #163
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Fixes #162
Changes
Check res.headersSent at the beginning of the write() callback invoked by onFinished.
If the response headers have already been sent, stop without writing to the response. This prevents finalhandler from modifying a response sent by another operation and avoids ERR_HTTP_HEADERS_SENT.
The existing behavior of reading the complete request body remains unchanged.