How do I inspect the full URL generated by HTTParty?

I want to look at the full URL the HTTParty gem has constructed from my parameters, either before or after it is submitted, it doesn’t matter.

I would also be happy grabbing this from the response object, but I can’t see a way to do that either.

(Bit of background)

I’m building a wrapper for an API using the HTTParty gem. It’s broadly working, but occasionally I get an unexpected response from the remote site, and I want to dig into why – is it something I’ve sent incorrectly? If so, what? Have I somehow malformed the request? Looking at the raw URL would be good for troubleshooting but I can’t see how.

For example:

HTTParty.get('http://example.com/resource', query: { foo: 'bar' })

Presumably generates:

http://example.com/resource?foo=bar

But how can I check this?

In one instance I did this:

HTTParty.get('http://example.com/resource', query: { id_numbers: [1, 2, 3] }

But it didn’t work. Through experimenting I was able to produce this which worked:

HTTParty.get('http://example.com/resource', query: { id_numbers: [1, 2, 3].join(',') }

So clearly HTTParty’s default approach to forming the query string didn’t align with the API designers’ preferred format. That’s fine, but it was awkward to figure out exactly what was needed.