[v3] express.use() on custom path does not work without setting `graphqlEndpoint`

[charlypoly]

The following code example returns 404 when querying /api/v1/graphql:

const app = express();

const yoga = createYoga({
	schema: // ...
});

app.use(`/api/v1/graphql`, yoga);

However, it works with the following:

const app = express();

const yoga = createYoga({
    graphqlEndpoint: `/api/v1/graphql`,
	schema: // ...
});

app.use(`/api/v1/graphql`, yoga);

If this is the expected behavior, we should document it 📖

[EmrysMyrddin]

I have added a failing test case.
The problem is not exactly what is shown in the given example. The bug appears only when the endpoint doesn't end with /graphql.

I'm working on a fix, but for now I'm not sure how I can do this without introducing a breaking change.

[ardatan]

You have to define graphqlEndpoint in createYoga.

app.use('/my-path', 
  createYoga({
     ....,
     graphqlEndpoint: '/my-path'
  })
)

[EmrysMyrddin]

Yes, that's a workaround, but I'm trying to find a fix which doesn't require the developer to duplicate the endpoint setting.

If I don't find a good way to do it, I will just try to improve documentation to make it clear graphqlEndpoint is mandatory even when using external http server router.

[ardatan]

No it is not a workaround. It hasn't been documented yet, this is why we keep this issue open.

[EmrysMyrddin]

Ok, I will update the documentation then :-)
Thank you for the clarification !

[EmrysMyrddin]

@ardatan Do you think I have to add this information in every pages in the "Integrations" category ?