Return 503 for POST request in Nginx
**HTTP 503 POST Request Return in Nginx**
**Issue:**
A 503 Service Unavailable error is returned when sending a POST request to Nginx.
**Solutions:**
**Solution 1: Force 405 Requests to Actual URI**
```
error_page 405 = $uri;
```
**Solution 2: Capture 405 Errors in Maintenance Page**
```
recursive_error_pages on;
if (-f $document_root/system/maintenance.html) {
return 503;
}
error_page 404 /404.html;
error_page 500 502 504 /500.html;
error_page 503 @503;
location @503 {
error_page 405 = /system/maintenance.html;
if (-f $request_filename) {
break;
}
rewrite ^(.*)$ /system/maintenance.html break;
}
```
**Solution 3: Use Internal Location for 503 Errors**
```
error_page 503 /503;
location /503 {
internal;
root /path/to/config;
try_files /503.json =404;
}
```