Not able to construct proper header for groovy function Get request - jenkins

Question

Writing my first function here for Groovy native lib and running into an issue. A method to get Github Labels for pull-requests. #param github_token String token with permission to access and read PR information.
getLabelsPerPullRequest.groovy: 19: expecting '}', found ':' # line 19, column 28. 'Authorization': 'token '+ github_token, ^
Here is my function
import groovy.json.JsonSlurper
def getLabelsPerPullRequest(String github_token) {
def labels
def scmHead = jenkins.scm.api.SCMHead.HeadByItem.findHead(currentBuild.rawBuild.getParent())
def repo = scmHead.getSourceRepo()
def prId = scmHead.getId()
if(github_token && github_token != null) {
// Set the call headers with Oauth token.
def headers = "{'Authorization': 'token '+ ${github_token},'Accept': 'application/vnd.github.v3+json'}"
// Construct request number URL in Github
def pr_url = "https://github.optum.com/api/v3/repos/SOP-Bot/${repo}/pulls/${prNbr}"
def json = sh(
script: "curl -X Get ${pr_url} -H ${headers}",
returnStdout: true
)
def prInfo = JsonOutput.toJson(text: json)
labels = prInfo.labels
}
return labels
}

Answer 1

Each header needs to be a separate -H argument. You can do something like this. I added -s to curl because you probably don't want the extra progress output but it may not actually be an issue.
def headers = [
"-H 'Authorization: token ${gitub_token}'",
"-H 'Accept: application/vnd.github.v3+json'"
]
...
def json = sh(
script: "curl -s -X GET ${headers.join(' ')} '${pr_url}'",
returnStdout: true
)