Why am I getting an HTTP code 405 (Method Not Allowed) error and how do I fix it? Alternatively, for a more

"HTTP code 405 - Method Not Allowed: What’s causing this and how to resolve it?"

Hey folks,

So I keep hitting this *HTTP code 405* error when trying to send a POST request to an API endpoint. Super annoying, right? Like, why’s it saying "Method Not Allowed" when I’m pretty sure I’m using the right method?

From what I’ve gathered, it usually means the server’s like, "Nope, you can’t do that here." Maybe the endpoint only accepts GET, but I’m sending POST? Or maybe CORS is being a pain?

Anyone else run into this? How’d you fix it? I’ve tried checking the docs, but they’re not always clear.

Thanks in advance!

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(Or the longer version, if you prefer):

"Why am I getting an HTTP code 405 (Method Not Allowed) error and how do I fix it?"

Alright, so I’m stuck with this *HTTP code 405* thing. Basically, my app’s trying to call an API, but the server’s like, "Nah, that method’s not allowed here."

I *think* it’s because I’m using POST where only GET works (or vice versa). But I’m not 100% sure. Could also be a misconfigured server or maybe missing headers?

Anyone dealt with this before? What worked for you? Double-checking the API docs? Tweaking the request type? Or is there some sneaky server-side setting I’m missing?

Appreciate any tips! Cheers.

Hey! I ran into the same HTTP code 405 issue last week. Turns out, the API endpoint I was hitting only accepted GET, but my frontend was sending POST.

Quick fix: double-check the API docs or use Postman to test different methods. Sometimes the docs are outdated, so trying OPTIONS first can help list allowed methods.

Also, if it’s a CORS thing, make sure your server’s sending the right headers. Chrome DevTools can show you the preflight response.

Ugh, HTTP code 405 is the worst. Had this happen when I accidentally sent PUT instead of PATCH.

Pro tip: Use curl with -v to see the full request/response. Like:
`curl -v -X POST https://api.example.com/endpoint`

If the server responds with "Allow: GET, HEAD", you’ll know POST isn’t supported. Saves a ton of guesswork!

405 errors usually mean the server’s configured to reject your request method. Could be:
- Wrong method (POST vs GET)
- Missing auth headers
- Server-side routing misconfigured

Try tools like Insomnia or httpie to debug. They’re way cleaner than fiddling with browser devtools.

Fun fact: HTTP code 405 *should* include an "Allow" header listing valid methods. But some servers don’t. 🙄

If you’re using fetch() in JS, check the response.headers.get('Allow'). If it’s empty, blame bad server config.

Workaround? Bug the API maintainers or brute-force methods until one works (not ideal, but hey).

Thanks everyone! Tried the Postman trick and yeah, the endpoint only allows GET. Docs were wrong. 🙃

Weirdly, adding a trailing slash fixed it for some routes too. Gonna bug the API team about updating their docs.

Any tips for automating these checks in CI? Hate manual testing.

Yo, 405 gang! Had this with a REST API last month. My dumb mistake? Forgot the trailing slash in the URL.

Some frameworks treat `/api/resource` and `/api/resource/` as different routes. One accepted POST, the other didn’t.

Worth checking if your URL matches the docs *exactly*.

HTTP code 405 can also pop up if you’re hitting a read-only endpoint. Like, maybe the /data endpoint only allows GET, but you’re trying to DELETE.

Quick test: Fire up Postman and try every method (GET, POST, etc.) to see what’s actually allowed. Docs lie sometimes.

If you’re getting HTTP code 405, peek at the server logs if you can. Often, the error’s clearer there.

For example, Nginx might log "client attempted to POST to static file" or something obvious. No logs? Time to beg your DevOps friend.

Proxies can cause this too! Once had a 405 because CloudFront was blocking POST requests to a cached endpoint.

Solution? Adjust cache behaviors or bypass the CDN for testing. AWS docs are your friend here.