Proxy - changing User-Agent with additionalProxyRequestHeaders stopped working after 3.2.0

[pfonseca-trip]

Proposal

I'm using an API where part of its functionality depends on the User-Agent. To make it work with WireMock proxy I need to rewrite the User-Agent header using additionalProxyRequestHeaders, for example:

"response" : { "proxyBaseUrl": "https://one.api.com", "additionalProxyRequestHeaders": { "User-Agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 15_2 like Mac OS X)" } }

This stopped working after version 3.2.0.

Reproduction steps

0. With WireMock >= 3.3.0
1. Route a request through WireMock proxy
2. Rewrite the User-Agent header with additionalProxyRequestHeaders

Expected result:
The host is sent the header defined in additionalProxyRequestHeaders

Actual result:
The host is sent the default WireMock user agent

References

https://wiremock.org/docs/proxying/#additional-headers

[kyle-winkelman]

Can you try remove-headers to clear the existing value (I believe this requires 3.5+):

{
  "proxyBaseUrl": "https://one.api.com",
  "removeProxyRequestHeaders": [
      "User-Agent"
  ],
  "additionalProxyRequestHeaders": {
    "User-Agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 15_2 like Mac OS X)"
  }
}