What is HTTP Error 405 (Method Not Allowed) and How to Fix
Blog post from Postman
An HTTP 405 error, or "Method Not Allowed," occurs when a request reaches a server where the resource exists, but the server refuses the method used, such as POST, PUT, or DELETE, often due to the endpoint being read-only or only accepting specific methods. This error is characterized by a valid request syntax and authentication not being the issue, with the server including an Allow header in its response to indicate permissible methods. Common causes include using incorrect request methods, endpoint URL errors, routing or server misconfiguration, and framework restrictions. To address 405 errors, it is recommended to check API documentation for supported methods, inspect the Allow header, verify endpoint URLs, review server configurations, and ensure proper routing rules in the application. Tools like Postman can aid in diagnosing and preventing these errors by allowing users to switch between methods, view Allow headers, and automate testing. Preventing 405 errors involves designing robust APIs, following RESTful conventions, handling OPTIONS requests, providing clear error messages, and maintaining accurate documentation of supported methods.
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