Fix the missing Ethon log info

[nulldef]

Currently using the httplog with ethon-based http lib we're getting a log with the missing URL in it.

 [httplog] Sending: GET
 [httplog] Header: accept: */*
 [httplog] Header: foo: bar
 [httplog] Connecting: localhost:9292
 [httplog] Status: 200
 [httplog] Benchmark: 0.001562 seconds

So we can memoize the URL in the @http_log variable and use it for logging.

[trusche]

Hi @nulldef thanks for the PR, I never knew this was an issue. Could I bother you adding a test that fails before and passes after you fix?

[nulldef]

Hi @trusche
Sure! I've added some specs for it 👍

The issue basically comes from the Typhoeus gem, it cleans up all the data right after the request is performed.

https://github.com/typhoeus/typhoeus/blob/master/lib/typhoeus/easy_factory.rb#L171
https://github.com/typhoeus/typhoeus/blob/master/lib/typhoeus/pool.rb#L19

So we don't have any data to log.

[nulldef]

HI @trusche!
I just was wondering if you have time to take a look at this PR by any chance :)

[trusche]

Sorry, missed that! Merging now.