Repeater returns encoded body even if content-encoding is gzip

[derevnjuk]

Repeater returns encoded body even if content-encoding: gzip body. Originally this was found on DVWA AO using repeater started from code (at least at Windows machine).

Steps to reproduce:

1. Start a repeater using https://github.com/NeuraLegion/sectester-js/tree/master/packages/repeater
2. Test DVWA cms AO using repeater started at step 1 (mind that there’s no additional header at stage 1).

DVWA AO

{
  "type": "multistep",
  "name": "DVWA-CMS",
  "test": {
    "request": {
      "protocol": "http",
      "method": "GET",
      "url": "http://dvwa2.neuralegion.com",
      "changeMethodOnRedirect": false,
      "followRedirects": false,
      "maxRedirects": 0
    }
  },
  "invalidSessionDetection": [
    {
      "type": "header",
      "name": "location",
      "patterns": [
        "login"
      ]
    }
  ],
  "config": {
    "multistep": {
      "steps": [
        {
          "name": "stage1",
          "request": {
            "method": "GET",
            "url": "http://dvwa2.neuralegion.com/login.php",
            "changeMethodOnRedirect": false,
            "protocol": "http",
            "followRedirects": true,
            "maxRedirects": 3
          },
          "successResponseDetection": [
            {
              "type": "status",
              "statuses": [
                200
              ]
            }
          ]
        },
        {
          "name": "stage2",
          "request": {
            "method": "POST",
            "url": "http://dvwa2.neuralegion.com/login.php",
            "changeMethodOnRedirect": false,
            "protocol": "http",
            "followRedirects": false,
            "maxRedirects": 0,
            "headers": [
              {
                "name": "content-type",
                "value": "application/x-www-form-urlencoded",
                "mergeStrategy": "replace"
              }
            ],
            "body": "username=admin&password=password&Login=Login&user_token={{ stage1.response.body | match: /value=.(.{32})./ }}"
          },
          "successResponseDetection": [
            {
              "type": "header",
              "name": "location",
              "patterns": [
                "index"
              ]
            }
          ]
        }
      ]
    }
  }
}

Actual result: encoded data in response body at stage 1, failing step 2.

Expected result: success at all stages.

Note: adding to stage the accept-encoding: identity field fixes the issue.