The Next.js 14 App Router is encountering a 405 Method Not Allowed error when attempting a POST request in the API route. Interestingly, the same route structure

Question

The Next.js 14 App Router is encountering a 405 Method Not Allowed error when attempting a POST request in the API route. Interestingly, the same route structure

In my Next.js 14 application using the App Router, I have encountered a peculiar issue with two API routes:

While both routes function properly when running locally, only one of them works after deploying to Vercel. The "/api/vision/describe-image/route.ts" route functions as expected, but the "/api/mini/describe-image/route.ts" route returns a 405 error.

Both routes contain a POST function and handle requests in a similar manner. The successful route processes image data using OpenAI's API, whereas the problematic route attempts to do the same.

The non-working route is being called as follows:

javascriptCopyconst response = await fetch("/api/mini/describe-image", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    message: "Image uploaded by user",
    image: imageData,
    conversation,
    visitorId: user?.sub ?? visitorId,
    conversationId,
  }),
});

I have double-checked the file structure and ensured that a POST request is being sent. What could be the cause of this 405 error, and how can I go about troubleshooting it?

Any insights or suggestions?

typescript next.js app-router

Answer 1

Answer №1

I encountered a similar error with the Pages Router in my code:

import * as admin from 'firebase-admin';

// The issue was not within the backend handler.
if (!admin.apps.length)
  admin.initializeApp({
  // ...
  });

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
// ...
}

It turns out the error originated outside of the handler when I was initializing the firebase-admin module (due to a missing variable on Vercel).

Vercel assumes that if an error occurs outside of the route handlers, you may not be able to handle the request, leading to a 405 HTTP status response.

I suggest checking your function logs on Vercel to see if you are experiencing a similar issue. You can do this by navigating to your project on Vercel and clicking 'Logs' at the top.

Answer 2

I encountered a similar error with the Pages Router in my code:

import * as admin from 'firebase-admin';

// The issue was not within the backend handler.
if (!admin.apps.length)
  admin.initializeApp({
  // ...
  });

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
// ...
}

It turns out the error originated outside of the handler when I was initializing the firebase-admin module (due to a missing variable on Vercel).

Vercel assumes that if an error occurs outside of the route handlers, you may not be able to handle the request, leading to a 405 HTTP status response.

I suggest checking your function logs on Vercel to see if you are experiencing a similar issue. You can do this by navigating to your project on Vercel and clicking 'Logs' at the top.

The Next.js 14 App Router is encountering a 405 Method Not Allowed error when attempting a POST request in the API route. Interestingly, the same route structure

Answer №1

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