withCredentials failing for credential type(userNamePassword vs stringCredential) - jenkins

Question

I am trying to access Grafana from a Jenkins pipeline(withCredentials + httpRequest).
This is how the credential(the Grafana's actual admin username, and password) looks in Jenkins:
The partial pipeline code:
script.withCredentials([script.string(
credentialsId: "${credentialsEnvironment}",
variable: 'usernamePassword')
]) {
String auth = "${script.usernamePassword}".bytes.encodeBase64().toString()
Map params = defaultArgs + httpParams
def response = []
try {
response = script.httpRequest(
params +
[
url: "${apiEndpoint}/${url}",
customHeaders: [[name: 'Authorization', value: "Basic ${auth}"]]
]
)
if (response && (response.status != 200 && response.status != 201)) {
script.echo "Response status: ${response.status}"
script.echo "Response message: ${response.content}"
}
return response
} catch (ex) {
LogUtil.echoStacktraceToScript(script, ex)
throw new ObservabilityException("Error: An exception occured when sending request with params: ${params}", ex)
}
}
The exception:
10:49:56 credentialsEnvironment: sb_1365_kraken_monitoring_scp_west_zone01_z01_grafana_admin
10:49:56 [Pipeline] withCredentials
10:49:56 [Pipeline] // withCredentials
10:49:56 [Pipeline] echo
10:49:56 org.jenkinsci.plugins.credentialsbinding.impl.CredentialNotFoundException: Credentials 'sb_1365_kraken_monitoring_scp_west_zone01_z01_grafana_admin' is of type 'Username with password' where 'org.jenkinsci.plugins.plaincredentials.StringCredentials' was expected
10:49:56 at org.jenkinsci.plugins.credentialsbinding.MultiBinding.getCredentials(MultiBinding.java:208)
10:49:56 at org.jenkinsci.plugins.credentialsbinding.impl.StringBinding.bindSingle(StringBinding.java:57)
10:49:56 at org.jenkinsci.plugins.credentialsbinding.Binding.bind(Binding.java:149)
10:49:56 at org.jenkinsci.plugins.credentialsbinding.impl.BindingStep$Execution2.doStart(BindingStep.java:132)
10:49:56 at org.jenkinsci.plugins.workflow.steps.GeneralNonBlockingStepExecution.lambda$run$0(GeneralNonBlockingStepExecution.java:77)
10:49:56 at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
10:49:56 at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
10:49:56 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
10:49:56 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
10:49:56 at java.base/java.lang.Thread.run(Thread.java:829)
What exactly am I missing here?
------Edit-1--------
I modified the code but now I am clueless about how to pass the username, and password as the httpRequest doc. says nothing about it.
script.println "Attempting to use ${credentialsEnvironment}"
script.withCredentials([script.usernamePassword(
credentialsId: "${credentialsEnvironment}",
passwordVariable: 'passw', usernameVariable: 'user')
]) {
script.println "user: ${script.user}"
String auth = "${script.user}".bytes.encodeBase64().toString()
script.println "auth: ${auth}"
Map params = defaultArgs + httpParams
def response = []
try {
response = script.httpRequest(
params +
[
url: "${apiEndpoint}/${url}",
customHeaders: [[name: 'Authorization', value: "Basic ${auth}"]]
]
)
if (response && (response.status != 200 && response.status != 201)) {
script.echo "Response status: ${response.status}"
script.echo "Response message: ${response.content}"
}
return response
} catch (ex) {
LogUtil.echoStacktraceToScript(script, ex)
throw new ObservabilityException("Error: An exception occured when sending request with params: ${params}", ex)
}
}
Output:
credentialsEnvironment: sb_1365_kraken_monitoring_scp_west_zone01_z01_grafana_admin
13:05:52 [Pipeline] echo
13:05:52 Attempting to use sb_1365_kraken_monitoring_scp_west_zone01_z01_grafana_admin
13:05:52 [Pipeline] withCredentials
13:05:52 Masking supported pattern matches of $user or $passw
13:05:52 [Pipeline] {
13:05:52 [Pipeline] echo
13:05:52 user: ****
13:05:52 [Pipeline] echo
13:05:52 auth: YWRtaW50ZXN0
13:05:52 [Pipeline] httpRequest
13:05:52 HttpMethod: GET
13:05:52 URL: https://plg-grafana-sb-1365-kraken-monitoring.apps.scp-west-zone01-z01.net/api/folders
13:05:52 Content-Type: application/json
13:05:52 Accept: application/json
13:05:52 Authorization: *****
13:05:52 Sending request to url: https://plg-grafana-sb-1365-kraken-monitoring.apps.scp-west-zone01-z01.net/api/folders
13:05:52 Response Code: HTTP/1.1 401 Unauthorized
13:05:52 Success: Status code 401 is in the accepted range: 100:500
13:05:52 [Pipeline] echo
13:05:52 Response status: 401
13:05:52 [Pipeline] echo
13:05:52 Response message: {"message":"Invalid Basic Auth Header","traceID":""}

Answer 1

You don`t need withCredentials with httpRequest plugin; just pass the credential id. Try something like this:
httpRequest url:"${apiEndpoint}/${url}", ..., authentication: credentialsEnvironment
See how to use httpRequest in Jenkinsfile pipeline with basic auth