ProxyURL path configuration

[tomas-pinto]

Is it possible to add transformers to url path logic?

In case the request is of the form: http://host1/a/b/c, I want to be able to proxy to http://host2/c/d.

[StefH]

@tomas-pinto

Current you can indeed only replace source path with a hard-coded new path using:

/// <summary>
/// Defines an old path param and a new path param to be replaced when proxying.
/// </summary>
public class ProxyUrlReplaceSettings
{
    /// <summary>
    /// The old path value to be replaced by the new path value
    /// </summary>
    public string OldValue { get; set; } = null!;

    /// <summary>
    /// The new path value to replace the old value with
    /// </summary>
    public string NewValue { get; set; } = null!;

    /// <summary>
    /// Defines if the case should be ignored when replacing.
    /// </summary>
    public bool IgnoreCase { get; set; }
}

I think it's possible to add logic so that NewValue will also be handled as a Handlebars template, which means you should be able to do any transform you like.

Is this a solution?

[StefH]

#1361

[tomas-pinto]

Thank you very much @StefH! That seems to be what I needed.
Could you please update wiremock.net-windows docker image for me to test?

[StefH]

@tomas-pinto
mmm,

I doubt if you can configure this new logic in docker?

[StefH]

@tomas-pinto
I just checked, it's not yet possible to configure this using mapping json. I need to make a fix.

[StefH]

The json model will look like:

public class ProxyUrlReplaceSettingsModel
{
    /// <summary>
    /// The old path value to be replaced by the new path value
    /// </summary>
    public string OldValue { get; set; } = null!;

    /// <summary>
    /// The new path value to replace the old value with
    /// </summary>
    public string NewValue { get; set; } = null!;

    /// <summary>
    /// Defines if the case should be ignored when replacing.
    /// </summary>
    public bool IgnoreCase { get; set; }

    /// <summary>
    /// Holds the transformation template.
    /// </summary>
    public string? TransformTemplate { get; set; }

    /// <summary>
    /// The transformer type.
    /// </summary>
    public TransformerType TransformerType { get; set; } = TransformerType.Handlebars;
}

[StefH]

#1362

[tomas-pinto]

Hello @StefH, I tested with image "sheyenrath/wiremock.net-windows:1.13.0" and when I give only the TransformerTemplate parameter in the mapping I get a 500 saying:

{
    "Status": "Value cannot be null. (Parameter 'oldValue')"
}

Mapping that was posted:

{
    "Guid": "f1c4d6b0-4125-4726-a882-a11050a68b28",
    "UpdatedAt": "2025-09-30T15:51:33.0785915Z",
    "Request": {
      "Path": {
        "Matchers": [
          {
            "Name": "RegexMatcher",
            "Pattern": "/(.*?)"
          }
        ]
      },
      "Methods": [
        "POST"
      ]
    },
    "Response": {
      "ProxyUrl": "http://abc",
      "ProxyUrlReplaceSettings": {
        "TransformTemplate": "{{this}}-transformed"
      }
    }
}

Additionally, if I do GET mappings "TransformTemplate" is not being parsed:

{
        "Guid": "f1c4d6b0-4125-4726-a882-a11050a68b28",
        "UpdatedAt": "2025-10-01T08:25:47.769994Z",
        "Request": {
            "Path": {
                "Matchers": [
                    {
                        "Name": "RegexMatcher",
                        "Pattern": "/(.*?)",
                        "IgnoreCase": false
                    }
                ]
            },
            "Methods": [
                "POST"
            ]
        },
        "Response": {
            "ProxyUrl": "http://abc",
            "ProxyUrlReplaceSettings": {
                "IgnoreCase": false
            }
        }
}

[StefH]

• 500 error should not happen ; i will check that
• TransformTemplate is not yet parsed, I need to add some more logic and create a new docker

[StefH]

@tomas-pinto can you try docker version 1.14.0-preview-01?

[StefH]

@tomas-pinto were you able test this version?