[Feature Request] Support environment variables in defaultHeaders

[loverde]

Please enhance the rest-client.defaultHeaders setting so that it supports environment variables (specifically in the value of the header, but might as well implement it in both the key and value).

Steps to Reproduce:

1. Define a defaultHeader that uses an environment variable, e.g.

    "rest-client.environmentVariables": {
        "$shared": {
            "access_token": "123"
        }
    },
    "rest-client.defaultHeaders": {
        "Authorization": "Bearer {{access_token}}"
    }

2. Submit a request.

The outgoing request contains the raw value

Authorization: Bearer {{access_token}}

But ideally it would contain:

Authorization: Bearer 123

[loverde]

It might also be nice, albeit probably a separate feature request to allow the defaultHeaders to be specified based on the HTTP method. E.g. to specify application/json for POSTs. Something like:

rest-client.defaultHeaders {
    "$shared:" {
        "Authorization": "Bearer {{access_token}}"
    },
    "POST": {
        "Content-Type": "application/json"
    }
}

[Huachao]

@loverde nice suggestion, I will consider this feature request carefully.

[tfnaylor]

This feature would be super useful.

Also, thanks for this amazing VS Code extension @Huachao . I might never use Postman again...

[erodewald]

Is this issue being worked on at all? I'd love to see this so I can add a unique correlation id to each request to my API for tracing purposes, so I would use the global var {{$guid}}.

[jnorkus]

I have this implemented in my fork (one line change) but I'm not sure it would get merged. I can share the code if anyone's interested.

[konradperzyna]

And one more vote for this.

[NickRimmer]

@Huachao thank you for the great extension! Is this topic still under discussion, or is there another way to use variables in the default headers I missed? (=

[EffNox]

And one more vote for this.