Not working v2.2.0

Describe the bug APM agent always fail when agent send the transaction data. The error message says “context.request.url.port should be string or null”

I[#] S[#/allOf/0] allOf failed
I[#/context/request/url/port]
S[#/allOf/0/properties/context/properties/request/properties/url/properties/port/type] expected string or null, but got number

To Reproduce Steps to reproduce the behavior:

1. Use this config ‘…’
2. Then call ‘…’
3. Then do ‘…’
4. See error

Expected behavior It works with v2.1.0

Environment (please complete the following information)

• OS: OS X
• Node.js version: 10.15.0
• APM Server version: 6.5.4
• Agent version: 2.2.0
• Koa version: 2.6.2
• Koa Router version: 7.4.0

How are you starting the agent? (please tick one of the boxes)

• Calling agent.start() directly (e.g. require('elastic-apm-node').start(...))
• Requiring elastic-apm-node/start from within the source code
• Starting node with -r elastic-apm-node/start

Additional context Add any other context about the problem here.

• Agent config options

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  replace this line with your agent config options
  

• package.json dependencies:

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  replace this line with your dependencies section from package.json
  

[watson]

I’ll look into why this wasn’t caught by our integration tests. It obviously shouldn’t have slipped through.

[watson]

Note to self: It seems we’ll allow port to be a number in APM Server 7.0.0: https://github.com/elastic/apm-server/pull/1813