Implement WebProxy in FlareSolverr

[Dakyne]

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Environment

• FlareSolverr version: Latest non beta (2.2.10)
• Last working FlareSolverr version: 2.2.10
• Operating system: Mac / Linux with browsers and curl
• Are you using Docker: yes
• FlareSolverr User-Agent (see log traces or / endpoint): Mozilla/5.0 (X11; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0
• Are you using a proxy or VPN? yes my own wireguard server to reach another LAN where flaresolverr is.
• Are you using Captcha Solver: yes
• If using captcha solver, which one: Harvester
• URL to test this issue: y

Description

I'm trying to add a RSS feed to sonarr/radarr and need to have only an URL. I know it should not be possible to do so, but in this case it would not be an issue. I'd be perfectly fine with a workaround by the way.

I'm trying to convert the following post request into the following get request:

curl -L -X POST 'http://192.168.1.54:8191/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
  "cmd": "request.get",
  "url": "https://www6.yggtorrent.lol/rss?action=generate&type=cat&id=2145&passkey=123soleil",
  "maxTimeout": 30000
}'

curl -L -X POST http://192.168.1.54:8191/v1?cmd=request.get&url=https%3A%2F%2Fwww6.yggtorrent.lol%2Frss%3Faction%3Dgenerate%26type%3Dcat%26id%3D2145%26passkey%3D123soleil&maxTimeout=30000

Logged Error Messages

The post request work, the get request doesn't

 * Connected to 192.168.1.54 (192.168.1.54) port 8191 (#0)
> POST /v1?cmd=request.get HTTP/1.1
> Host: 192.168.1.54:8191
> User-Agent: curl/7.85.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 500 Internal Server Error
< X-Powered-By: Express
< Content-Type: application/json; charset=utf-8
< Content-Length: 155
< ETag: W/"9b-xoBJRA054PsgNVEHLE7MbWN/R0s"
< Date: Tue, 20 Dec 2022 18:33:35 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
<
* Connection #0 to host 192.168.1.54 left intact
{"status":"error","message":"Error: Request parameter 'cmd' is mandatory.","startTimestamp":1671561215597,"endTimestamp":1671561215597,"version":"v2.2.10"}