When using http proxy in xcp server, import vdi content fails

[tkrafael]

XOA or XO from the sources?
XO from the sources

Describe the bug
When using host through http proxy, import vdi content fails with timeout:

2022-06-01T17:26:06.355Z xo:xapi WARN importVdiContent:  {
  error: Error: connect ETIMEDOUT 10.110.97.223:443
      at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1187:16)
      at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17) {
    errno: -110,
    code: 'ETIMEDOUT',
    syscall: 'connect',
    address: '10.110.97.223',
    port: 443,
    url: 'https://<host>/import_raw_vdi/?format=raw&vdi=OpaqueRef%3A7840ce0f-15e0-42c7-a6b2-2ebb118b30a0&session_id=OpaqueRef%3Aae0540bd-391c-4eed-babb-88a27645fb95&task_id=OpaqueRef%3Abfedf69c-e08a-44a3-8a1b-bbc5a3c76922',

To Reproduce
Steps to reproduce the behavior:

1. Add a new server in xo-web using http proxy configration
2. Import disk from "import" => "disk"
3. Select a vhd to be imported
4. In tasks content import gets stucks and the error above shows in xen-orchestra console

Using cloudconfig configuration triggers same error

Expected behavior
VDI imported successfully

Screenshots
No screenshots

Environment (please provide the following information):

• Node: 16.15.1
• xo-server: 5.95.0
• xo-web: 5.97.1
• hypervisor: not applicable

Additional context
I added httpagent configuration in putResource javascript function and that solves the issue

[tkrafael]

Create PR #6261 to make this work