What causes HTTP 405 Method Not Allowed?

Using POST on a read-only endpoint. Using GET on a write-only endpoint. API endpoint only supports specific methods. Form action using wrong HTTP method.

HTTP 405 Method Not Allowed

Client Error

The HTTP method used (GET, POST, PUT, DELETE, etc.) is not supported for the requested resource.

Common Causes

Using POST on a read-only endpoint
Using GET on a write-only endpoint
API endpoint only supports specific methods
Form action using wrong HTTP method

How to Fix

Check the Allow response header for supported methods
Use the correct HTTP method for the endpoint
Review API documentation for method requirements

Related Status Codes

400 Bad Request 501 Not Implemented

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