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406
Not Acceptable
The server cannot produce a response matching the list of acceptable values in the request headers.
Common Causes
- •Accept header mismatch
- •Content negotiation failure
- •Unsupported response format
Fix Solutions
Check Accept header
Ensure Accept header includes a format the server can provide.
Code Examples
// Express.js - Content negotiation
app.get('/api/data', (req, res) => {
const accept = req.headers.accept;
if (!accept?.includes('application/json')) {
return res.status(406).json({
error: 'Only JSON format is supported'
});
}
res.json({ data: [] });
});