Cant print Headers in karate feature file - karate

Question

I am using karate (https://github.com/intuit/karate) for some API testing and have a test with invalid headers. I would like to print the headers out while debugging, to make sure everything is being set properly. This is how i set and attempt to print, but nothing is working. I can find anything on it in the documentation. Does anybody know? Much appreciated!!
Given path '/metadata/project/' + projectID + '/graph/' + graphID
And headers { Authorization: 'INVALID', Content-Type:#(headerValue)}
And request graphJSON
* print headers // prints nothing
* print requestHeaders // prints nothing
* print requestHeader // prints nothing
* print header // prints nothing
When method put
Then status 401 // this passes, so i know the header is being set
* print response // prints correctly
* print responseHeaders //prints correctly
How to print the headers that will be sent?

Answer 1

I'm surprised you don't see the headers in the console and in the log target/karate.log - this should happen by default and you can follow the instructions here: https://github.com/intuit/karate#logging
Also refer to the docs for the built-in variables instead of trying to guess them: https://github.com/intuit/karate#responseheaders
But if you really want to print the actual headers sent (very rarely needed), you can do this:
* print 'headers:', karate.prevRequest.headers
EDIT: in Karate 1.3.0 onwards this is recommended:
* print karate.response.headers
This is explained here: https://github.com/intuit/karate#karate-prevrequest
EDIT: I noticed you may be making a common mistake, when you have hyphens in the JSON key - you need to use string quotes:
And headers { Authorization: 'INVALID', 'Content-Type': '#(headerValue)' }
And yes, this is explained in the docs as well.