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$.resolve[^hash::create[]] test added (related to feature #1295)

@main[]

1. curl resolve exception:
  ^try-catch{ ^curl:load[ $.url[https://no-such-domain] ] }

#resolve option tests: with the nproc limit set below, the curl threaded resolver
#fails to start a getaddrinfo thread, so every request must be resolved
#either via explicit resolve entries or via the 'parser' resolve mode

$ip[^inet:name2ip[www.parser.ru]]
$status:limit-nproc(1)

1.2. parser resolve exception:
  ^try-catch{ ^curl:load[ $.url[https://no-such-domain] $.resolve[parser] ] }

1.3. detailed resolver error message from CURLOPT_ERRORBUFFER:
  ^try-catch{ ^curl:load[ $.url[https://no-such-domain] ] }

2. explicit resolve entries populate DNS cache bypassing the resolver:
  ^load[ $.resolve[ $.[www.parser.ru:80][$ip] ] ]

2.1. port-less entry covers both http and https:
  ^load[ $.resolve[ $.[www.parser.ru][$ip] ] ]
  ^load[ $.resolve[ $.[www.parser.ru][$ip] ] ;https://www.parser.ru/_/tests/readme]

3. 'parser' mode resolves synchronously and populates the resolve list automatically:
  ^load[ $.resolve[parser] ]

4. 'parser' mode can be set outside of 'session' operator:
  ^curl:options[ $.resolve[parser] ]
  ^load[]

5. explicit entries have priority over 'parser' mode:
  ^curl:session{
    ^curl:options[ $.resolve[ $.[www.parser.ru][195.218.200.197] ] ]
    connects to rol8: ^try-catch-filtered{ ^load[] }
    ^curl:options[ $.resolve[^hash::create[]] ]
    parser resolves to real IP: ^load[]
  }

6. revert to 'curl' mode:
  ^curl:options[ $.resolve[curl] ]
  ^try-catch{ ^load[] }

7. second load finds the entry added by the first one:
  ^curl:session{
    ^curl:options[ $.resolve[parser] ]
    ^load[]
    ^curl:options[ $.resolve[curl] ]
    7.1. http OK: ^load[]
    7.2. https fails (OK): ^try-catch{ ^load[;https://www.parser.ru/_/tests/readme] }
  }

8. port option is used instead of :port in url:
  8.1. ^try-catch-filtered{ ^load[ $.resolve[parser] $.port(8080) ] }
  ^curl:options[ $.resolve[parser] ]
  8.2. ^load[;http://www.parser.ru:80/_/tests/readme]
  8.3. ^try-catch-filtered{ ^load[ $.port(8080) ;http://www.parser.ru:80/_/tests/readme] }

9. ^try-catch{ ^curl:options[ $.resolve[dns] ] }

10. empty mode = 'curl' mode:
  ^curl:options[ $.resolve[] ]
  ^try-catch{ ^load[] }

@load[options;url]
^show[^curl:load[ $options $.url[^if(def $url){$url}{http://www.parser.ru/_/tests/readme}] $.timeout(4) ]]

@show[f]
status: $f.status, size: $f.size