Cache: Fix check if endpoint is /graphql or not

[joselcvarela]

Description

By using CACHE_STATUS_HEADER we were able to check that Graphql requests always reported MISS which means that Graphql requests were not being cached.
The source of the issue is that Express reports on req.path the route we defined for the controller.
For example, we have a router for entire application where we define router.post('/graphl', graphqlRouter).
Then we define graphqlRouter.post('/', handler). In this case, inside handler our req.path will be / because /graphql was defined on parent.

In order to solve the issue we take req.originalUrl which contains the entire path of the request.

Also, it seems that System Graphql was not being cached, so I added those too, but let me know if that's intended and I can remove it.

After fixing the initial issue I found that every request was responding with the Grapqhl Introspection.
This was cause by retrieving the same key every time because req.query for Grapqhl requests does/should not exist.
So fixed the key to be based on req.body

Type of Change

• Bugfix (ref: Add GraphQL query POST caching #14371)
• Improvement
• New Feature
• Refactor / codestyle updates
• Other, please describe:

Requirements Checklist

• New / updated tests are included
• All tests are passing locally
• Performed a self-review of the submitted code

If adding a new feature:

• Documentation was added/updated. PR:

[licitdev]

PR affects all POST requests. Changes in progress...

[joselcvarela]

In fact this is not working as expected and will break eveything.
All Graphql request are responding with the introspection response 😐
Will take a look now

[rijkvanzanten]

In fact this is not working as expected and will break eveything.
All Graphql request are responding with the introspection response 😐
Will take a look now

Make sure you clear your own cache during testing occasionally

[rijkvanzanten]

Also gotta make sure we don't cache if the body includes mutations

[joselcvarela]

Also gotta make sure we don't cache if the body includes mutations

This seems to already be handled here:
https://github.com/directus/directus/blob/fix-graphql-cache-requests/api/src/middleware/graphql.ts#L61
and here:
https://github.com/directus/directus/blob/fix-graphql-cache-requests/api/src/middleware/respond.ts#L30
👍

Edit:
Tested doing mutations and no new entries were added to Redis