- Software and digital services
- HTTP service
405
HTTP 405 Method Not Allowed: this resource does not allow that method
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Medium
Quick answer
HTTP 405 means the origin server recognizes and implements the request method but the target resource does not allow it. The response must include an Allow header advertising the methods supported by that resource.
Safety first
Stop and check this first
- Do not bypass a 405 by tunnelling a method or changing a write to GET. Use only a method documented and authorized for the exact resource.
Safe checks you can perform
- Read the Allow response header
- Confirm the exact method and target URL
- Determine whether the origin returned 405
Leave these tasks to a qualified professional
- Do not attempt this professional task: Align route configuration with the published API contract
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Align route configuration with the published API contract
What they doThe service owner should compare router gateway and origin method policies and correct the first layer whose configured methods differ from the documented resource contract.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Read the Allow response header
Inspect the 405 response for Allow and record the advertised methods. The origin server is required to generate this header for a 405 response.
Allow describes methods advertised for this resource at that time. It does not grant permission or replace authentication.
Evidence: RFC 9110 section 10.2.1 - Allow
Confirm the exact method and target URL
Record whether the request used GET POST PUT PATCH DELETE or another method and compare the full route with the endpoint documentation.
Do not change a write into a different method unless the endpoint contract explicitly requires it.
Evidence: RFC 9110 section 15.5.6 - 405 Method Not Allowed
Determine whether the origin returned 405
Use response headers and request identifiers to distinguish the origin from an edge gateway or framework route before changing application code.
RFC 9110 assigns the required Allow behavior to the origin server. Preserve evidence if an intermediary returns a conflicting response.
Evidence: RFC 9110 section 15.5.6 - 405 Method Not Allowed · RFC 9110 section 10.2.1 - Allow
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Software and digital services
- Brand
- HTTP
- Product type
- HTTP service
Known code variants
- 405 Method Not Allowed
- 405 Methode nicht zulässig
- 405 Método no permitido
- 405 Metodo non consentito
- code erreur 405
- HTTP 405
- HTTP status 405
- status code 405
What it means
The method can be valid elsewhere while remaining invalid for this exact target. Do not reinterpret 405 as missing authentication or an unknown method.
Warnings and stop conditions
- Higheditorial warning
Do not bypass a 405 by tunnelling a method or changing a write to GET. Use only a method documented and authorized for the exact resource.
Evidence: RFC 9110 section 15.5.6 - 405 Method Not Allowed
Symptoms and causes
Probable causes · in order
- The target resource does not allow the requested methodConfirmed
RFC 9110 defines 405 for a method that the origin recognizes and implements but does not allow for this target resource.
Evidence: RFC 9110 section 15.5.6 - 405 Method Not Allowed
Virtual technician
Does 405 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
RFC 9110 section 15.5.6 - 405 Method Not Allowed
Internet Engineering Task Force · 2022 · official_doc
- 2
RFC 9110 section 10.2.1 - Allow
Internet Engineering Task Force · 2022 · official_doc
Was this entry useful?