Prefer header kept for subsecuent requests

[r1ckr]

Describe the bug
I am following the following documentation to select what example I want when making a request:
https://stoplight.io/p/docs/gh/stoplightio/prism/docs/guides/01-mocking.md#response-examples

When I specify the Prefer: example=<my example name>; header it returns the requested example, but prism caches the header and all the subsequent requests without it will try to get that example.

To Reproduce
If I have following 2 paths:

/my-path
  examples:
    example1: <my example here>
    example2: <my example here>
/my-other-path
  examples:
    another-example-name: <my example here>

Making a call to /my-path with header Prefer: example=example1; it will return the specified example with no issues.

If I make a call to /my-other-path without the prefer header, it will return this:

{"type":"https://stoplight.io/prism/errors#NOT_FOUND","title":"The server cannot find the requested content","status":404,"detail":"Response for contentType: application/json and exampleKey: example1 does not exist."}

It's like after making a call with the Prefer header, all the subsequent calls without it, will assume that I want the example1.

Expected behavior
I am expecting that when I don't specify the Prefer header, it returns the first example, as it is specified in the documentation.

This used to work with version 3.2.9

Environment:

• Library version: 3.3.2
• OS: Alpine Linux v3.11, macOS

Additional context
I am using your docker containers and locally in my mac, both fail

[XVincentX]

Hey @r1ckr,

that is really weird, since Prism does not have any caching mechanism at all. Can you share the full document you are using so I can have a deep look into?

Also, what Http client are you using? I suspect that it might be sending the header again, while you probably do not want that.

Can you reproduce the same issue with curl?

[Michael-Dawkins]

I have encountered the exact same problem today.
As soon as one request has the "Prefer": "example=example-1" header set, the subsequent requests to other endpoints give me an error because they do not have an "example-1".

I have tried specifying "Prefer": "dynamic=true" on the subsequent requests to try and "reset" the behaviour but it did not work.

Library: "@stoplight/prism-cli": "^3.3.2"
OS: MacOS 10.15.3

[Michael-Dawkins]

I have just tried with @stoplight/prism-cli@3.2.9 but I have the same issue.

[lehphyro]

This happens to me as well using curl.

[XVincentX]

@Michael-Dawkins @lehphyro Can you provide a sample document?

[lehphyro]

@XVincentX you can use the one attached to #1073

[XVincentX]

Can you try this branch? #1074