Question 856 in Plesk Question posted in
The official documentation for Plesk Obsidian can be found here.

nextJS 12 middleware breaking Plesk Site

I have nailed the issue down to the middleware as it was breaking everything. We host the site on Plesk so we understand that there maybe something that the server is doing differently.

However when I go to https://exampl.com/appstore
I should get a nice looking page but now I get
Error Message

I have tried everything to fix it, so I thought I would post here.

// middleware.ts
import { NextRequest, NextResponse, userAgent } from 'next/server'

export function middleware(request: NextRequest) {
  const { os } = userAgent(request)


  if(request.nextUrl.pathname === "/appstore")
  {
    if(os.name === "iOS"){
      return NextResponse.redirect('https://apps.apple.com/au/app/drn1/id1491656217')
    }
    if(os.name === "Android"){
      return NextResponse.redirect('https://play.google.com/store/apps/details?id=com.drn1.drn_player')
    }
 
 }
};


export const config = {
  matcher: [
    '/appstore'
  ],
}

I can confirm however that on Vercel servers it works fine – with no issues (https://drn-1-next-js.vercel.app/appstore).

This is what makes me think it’s a plesk issue or the way NextJS dev teams have coded middleware.

Tags:

2

Answers


  1. 0

    I see a couple of ways this could be an issue.

    1. Plesk is messing with the user agent. Your code doesn’t have a fallback response (even just a 500) for the case when os.name is not one of the ones you test
    2. === can have surprising effects. It is not a panacea. I have seen cases where APIs return wrapped values and then === fails. Before using === consider whether there is any implicit conversion that will cause an issue. As far as I can tell there is nothing reasonable that will implicitly cause if(os.name == "Android") to produce a false match.

    consider:

    > const x = 'string';
undefined
> const y = new String('string')
undefined
> x == y
true
> y == x
true
> x === y
false
> y === x
false
>
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  2. 0

    If this is where you host: Plesk. Then Plesk doesn’t currently support Next.js. They answered this about a month ago on Plesk Support.

    Q&A from direct form website (just in case they update the Q&A):

    Question:
    Does Plesk support Next.JS?

    Answer:
    Plesk does not support next.js at the moment. If you would like
    to see Next.JS support in Plesk, vote for this feature on Plesk
    UserVoice.

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