Describe the bug
I need to use Alibaba Cloud's remote sampling configuration. After I configure the host and port, I find that it is still unavailable, prompting 404 not found.

To Reproduce
Steps to reproduce the behavior:

1. The remote sampling url of Alibaba Cloud is http://tracing-analysis-dc-hz.aliyuncs.com/adapt_xxxxxx_xxxxx/api/sampling
   2.My tracer configuration is：

tracerConfig: {
  serviceName: 'demo',
  sampler: {
    type: 'remote',
    param: 1,
    host: '<host>',
    port: '<port>'
  },
  reporter: {
    collectorEndpoint: "<endpoint>"
  }
}

3.Prompt 404, unable to fetch remote configuration.

Expected behavior
The remote configuration can be obtained correctly.

Version (please complete the following information):

• OS: macOS
• Jaeger version: 3.18.1
• Deployment: nodejs

What troubleshooting steps did you try?
I have found the reason, because tracer config does not support custom sampling path.