Wiremock - How can I apply response templating to the header name? - wiremock

Question

I am trying to provide a MOCK service that takes a headerName and value from the query and returns it as a (dynamic) header with the response. I am using the following response definition:
"response" : {
"status" : 200,
"statusMessage": "OK",
"headers" : {
"Content-Type" : "application/json",
"{{request.query.debugHeader}}" : "{{request.query.debugHeaderValue}}"
},
"jsonBody" : {
"headerSent": "{{request.query.debugHeader}} {{request.query.debugHeaderValue}}"
},
"transformers": ["response-template"],
"base64Body" : ""
}
The header value is correctly evaluated and put into the response template, however I can't get the header name to be taken from the request.
When sending a request:
http://localhost:8090/example?debugHeader=name&debugHeaderValue=value
The result headers I get back are:
HTTP/1.1 200 OK
Content-Type: application/json
{{request.query.debugHeader}}: value
However I want {{request.query.debugHeader}} to be replaced with the actual request parameter value ("name" in the example above).
Any ideas?
Thanks in advance
Alex

Answer 1

This is supported in WireMock.Net.
The request which you need to specify looks like this:
{
"Guid": "90356dba-b36c-469a-a17e-669cd84f1f05",
"Priority": 0,
"Request": {
"Path": {
"Matchers": [
{
"Name": "WildcardMatcher",
"Pattern": "/trans",
"IgnoreCase": false
}
]
},
"Methods": [
"get"
]
},
"Response": {
"StatusCode": 200,
"BodyDestination": "SameAsSource",
"Body": "{\"msg\": \"Hello world : {{request.path}}\" }",
"UseTransformer": true,
"Headers": {
"Content-Type": "application/json",
"Transformed-Postman-Token_{{request.path}}": "token is {{request.headers.Postman-Token}}"
}
}
}
This will add the transformed header Transformed-Postman-Token_{{request.path}} in the response.

Answer 2

Presently this type of variability is not part of the out-of-the-box WireMock application and would have to be custom added. In the WireMock documentation the section Extending WireMock and in particular the part on Transforming Responses.