Problems with new ['webserver'] auth

Hi,

    I have an issue to get the new webserver auth working. My use case is a little bit more complex but I tried to
breakit down 
    so that can be easily debugged from your side:

    I just start the dpage/pgadmin4 as docker image, with a changed authsource. See:

    docker run -p 4444:80 \
        -e 'PGADMIN_DEFAULT_EMAIL=user@domain.com' \
        -e 'PGADMIN_DEFAULT_PASSWORD=SuperSecret' \
        -e 'PGADMIN_CONFIG_CONSOLE_LOG_LEVEL=10' \
        -e 'PGADMIN_CONFIG_AUTHENTICATION_SOURCES=["webserver"]' \
        dpage/pgadmin4


    Now I try to make an request with my local chrome and an installed header extension so that I can manipulate the
requestheaders. 
    I'm injecting the header: REMOTE_USER=test@hallo.de

    I get multiple redirects until the browser stop the loop.

    **** LOG ************

    2021-11-10 08:08:22,043: DEBUG    pgadmin:    Authentication initiated via source: webserver
    ::ffff:172.17.0.1 - - [10/Nov/2021:08:08:22 +0000] "GET / HTTP/1.1" 302 209 "-" "Mozilla/5.0 (Macintosh; Intel Mac
OSX 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36" 
    2021-11-10 08:08:22,052: DEBUG    pgadmin:    Authentication initiated via source: webserver
    ::ffff:172.17.0.1 - - [10/Nov/2021:08:08:22 +0000] "GET / HTTP/1.1" 302 209 "-" "Mozilla/5.0 (Macintosh; Intel Mac
OSX 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36" 

    **** HAR ** one request

          {
            "_initiator": {
              "type": "other"
            },
            "_priority": "VeryHigh",
            "_resourceType": "document",
            "cache": {},
            "connection": "318993",
            "request": {
              "method": "GET",
              "url": "http://localhost:4444/",
              "httpVersion": "HTTP/1.1",
              "headers": [
                {
                  "name": "Host",
                  "value": "localhost:4444"
                },
                {
                  "name": "Connection",
                  "value": "keep-alive"
                },
                {
                  "name": "Pragma",
                  "value": "no-cache"
                },
                {
                  "name": "Cache-Control",
                  "value": "no-cache"
                },
                {
                  "name": "sec-ch-ua",
                  "value": "\"Google Chrome\";v=\"95\", \"Chromium\";v=\"95\", \";Not A Brand\";v=\"99\""
                },
                {
                  "name": "sec-ch-ua-mobile",
                  "value": "?0"
                },
                {
                  "name": "sec-ch-ua-platform",
                  "value": "\"macOS\""
                },
                {
                  "name": "Upgrade-Insecure-Requests",
                  "value": "1"
                },
                {
                  "name": "User-Agent",
                  "value": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/95.0.4638.69Safari/537.36" 
                },
                {
                  "name": "Accept",
                  "value":
"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"
                },
                {
                  "name": "Sec-Fetch-Site",
                  "value": "none"
                },
                {
                  "name": "Sec-Fetch-Mode",
                  "value": "navigate"
                },
                {
                  "name": "Sec-Fetch-User",
                  "value": "?1"
                },
                {
                  "name": "Sec-Fetch-Dest",
                  "value": "document"
                },
                {
                  "name": "Accept-Encoding",
                  "value": "gzip, deflate, br"
                },
                {
                  "name": "Accept-Language",
                  "value": "en-US,en;q=0.9,de-DE;q=0.8,de;q=0.7"
                },
                {
                  "name": "Cookie",
                  "value": "_ga=GA1.1.1548965094.1632077396; _pk_id.1.1fff=b2a39c0044a229f7.1632078586.;
pga4_session=687afec6-df83-432e-9aae-c58c8a0aebb7!5IvAru1Bi1Entgxt96vVwrZqVQw="
                },
                {
                  "name": "remote_user",
                  "value": "test@hallo.de"
                }
              ],
              "queryString": [],
              "cookies": [
                {
                  "name": "_ga",
                  "value": "GA1.1.1548965094.1632077396",
                  "path": "/",
                  "domain": "localhost",
                  "expires": "2023-09-19T18:58:45.000Z",
                  "httpOnly": false,
                  "secure": false
                },
                {
                  "name": "_pk_id.1.1fff",
                  "value": "b2a39c0044a229f7.1632078586.",
                  "path": "/",
                  "domain": "localhost",
                  "expires": "2022-10-17T19:09:46.000Z",
                  "httpOnly": false,
                  "secure": false,
                  "sameSite": "Lax"
                },
                {
                  "name": "pga4_session",
                  "value": "687afec6-df83-432e-9aae-c58c8a0aebb7!5IvAru1Bi1Entgxt96vVwrZqVQw=",
                  "path": "/",
                  "domain": "localhost",
                  "expires": "2021-11-11T08:09:52.877Z",
                  "httpOnly": true,
                  "secure": false,
                  "sameSite": "Lax"
                }
              ],
              "headersSize": 919,
              "bodySize": 0
            },
            "response": {
              "status": 302,
              "statusText": "FOUND",
              "httpVersion": "HTTP/1.1",
              "headers": [
                {
                  "name": "Server",
                  "value": "gunicorn"
                },
                {
                  "name": "Date",
                  "value": "Wed, 10 Nov 2021 08:10:42 GMT"
                },
                {
                  "name": "Connection",
                  "value": "keep-alive"
                },
                {
                  "name": "Content-Type",
                  "value": "text/html; charset=utf-8"
                },
                {
                  "name": "Content-Length",
                  "value": "209"
                },
                {
                  "name": "Location",
                  "value": "http://localhost:4444/"
                },
                {
                  "name": "X-Frame-Options",
                  "value": "SAMEORIGIN"
                },
                {
                  "name": "Content-Security-Policy",
                  "value": "default-src ws: http: data: blob: 'unsafe-inline' 'unsafe-eval';"
                },
                {
                  "name": "X-Content-Type-Options",
                  "value": "nosniff"
                },
                {
                  "name": "X-XSS-Protection",
                  "value": "1; mode=block"
                },
                {
                  "name": "Set-Cookie",
                  "value": "pga4_session=687afec6-df83-432e-9aae-c58c8a0aebb7!5IvAru1Bi1Entgxt96vVwrZqVQw=;
Expires=Thu,11-Nov-2021 08:10:42 GMT; HttpOnly; Path=/; SameSite=Lax" 
                }
              ],
              "cookies": [
                {
                  "name": "pga4_session",
                  "value": "687afec6-df83-432e-9aae-c58c8a0aebb7!5IvAru1Bi1Entgxt96vVwrZqVQw=",
                  "path": "/",
                  "domain": "localhost",
                  "expires": "2021-11-11T08:10:42.000Z",
                  "httpOnly": true,
                  "secure": false,
                  "sameSite": "Lax"
                }
              ],
              "content": {
                "size": 0,
                "mimeType": "text/html",
                "compression": 0
              },
              "redirectURL": "http://localhost:4444/",
              "headersSize": 545,
              "bodySize": 0,
              "_transferSize": 545,
              "_error": null
            },
            "serverIPAddress": "[::1]",
            "startedDateTime": "2021-11-10T08:10:42.677Z",
            "time": 25.62499999839929,
            "timings": {
              "blocked": 8.999999998515705,
              "dns": -1,
              "ssl": -1,
              "connect": -1,
              "send": 0.125,
              "wait": 14.750000000436557,
              "receive": 1.7499999994470272,
              "_blocked_queueing": 3.8749999985157046
            }
          },

    bye
    Konrad