HTTP 405 Method Not Allowed

The HTTP method used is not supported for the requested resource.

What 405 means

HTTP 405 Method Not Allowed means the server knows the resource exists but doesn't support the HTTP method used. For example, trying to POST to a read-only endpoint or DELETE a resource that doesn't allow deletion.

Common causes

• Sending POST to a GET-only endpoint
• Trying to DELETE a protected resource
• API method mismatch
• Missing CORS preflight handling

How to fix it

• Check the Allow header for supported methods
• Review API documentation for correct methods
• Implement CORS preflight (OPTIONS) handling

SEO impact

No direct SEO impact for crawlers (they primarily use GET). May affect user experience on forms.

Monitoring tip

LemWatch can detect 405 errors in your API monitoring, helping identify misconfigured endpoints.