Vscode-restclient: Default Content-Type or Content-Type Setting

[adarshmadrecha]

Many use this extension to test the APIs. In order to test the API which expects the Content-Type to be set as application/json. Which I believe is true for most of the JSON based APIs. Needs to add an extra line to every Send Request.

It would save time and also give convenience to users if they could set the default Content-Type value in settings of this plugin.

[Huachao]

@adarshmadrecha actually you could use the rest-client.defaultHeaders setting to add your default headers for all outgoing requests, like

"rest-client.defaultHeaders": {
      "Content-Type": "application/json"
}