HTTP/Web Server Method Not Allowed

The HTTP 405 status code indicates the request method (e.g., POST, PUT, DELETE) is known by the server but is not supported by the target resource for the requested URL.

Common Causes

Sending a POST request to an endpoint that only accepts GET.
Incorrectly configured CORS (Cross-Origin Resource Sharing) preflight requests.
Server-side routing or framework (e.g., Express.js, Django, Spring) is not configured to handle the specific HTTP method for that route.

How to Fix

1 Check Allowed Methods with curl

Use the curl command with the -I (HEAD) or -X OPTIONS flag to inspect the server's response headers and see which methods are allowed for the resource.

BASH

$ curl -I -X OPTIONS https://api.example.com/resource

2 Verify Server-Side Route Configuration

Ensure your application's backend code explicitly handles the HTTP method you are trying to use for the specific endpoint/route.

BASH

 $ // Example for Express.js
app.post('/api/data', (req, res) => {
  // Handler for POST requests
});

3 Configure CORS Correctly

If the error occurs during a cross-origin request, ensure your CORS middleware is configured to allow the specific HTTP method.

BASH

 $ // Example for Express.js CORS configuration
const cors = require('cors');
app.use(cors({
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS']
}));