405 not allowed errors suck, but here’s a checklist:
1. Is your backend actually accepting POST? Some frameworks (like Laravel) need CSRF tokens.
2. Check CORS headers if it’s an API—missing `Access-Control-Allow-Methods` can trigger this.
3. Test on a different browser/device. Could be a weird cache thing.
If all else fails, curl is your friend:
```
curl -X POST -v http://yoursite.com/form-handler
```
1. Is your backend actually accepting POST? Some frameworks (like Laravel) need CSRF tokens.
2. Check CORS headers if it’s an API—missing `Access-Control-Allow-Methods` can trigger this.
3. Test on a different browser/device. Could be a weird cache thing.
If all else fails, curl is your friend:
```
curl -X POST -v http://yoursite.com/form-handler
```
