"Invalid HTTP request received" with SWAG reverse proxy, Glances 4.3.3 (Trixie)

[bondskin]

Check the bug
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In this case, just add a comment on this existing issue.

Describe the bug
Accessing glances locally works, once I am trying to access it through SWAG nginx proxy, I am getting "Invalid HTTP request received."

To Reproduce
Steps to reproduce the behavior:

1. Start Glances with the following options '...'
2. Press the key '....'
3. See error

Expected behavior
Glances to show up

Screenshots
reverse proxy:

local access:

``
Environement (please complete the following information)

• Operating System (lsb_release -a or OS name/version):
  Description: Debian GNU/Linux 13 (trixie)
  Release: 13
  Codename: trixie

• Glances & psutil versions:

• docker exec -it glances sh
  /app # glances -V
  Glances version: 4.3.3
  Glances API version: 4
  PsUtil version: 7.0.0
  Log file: /tmp/glances-root.log

• How do you install Glances (Pypi package, script, package manager, source):
  Docker

• Glances test: ` To be completed with result of:
  app # glances --issue

===============================================================================
Glances 4.3.3 (/app/glances/__init__.py)
Python 3.12.11 (/venv/bin/python3)
PsUtil 7.0.0 (/venv/lib/python3.12/site-packages/psutil/__init__.py)
===============================================================================
alert         [OK]    0.00001s
[]
amps          [OK]    0.00014s key=name
[{'count': 0,
  'countmax': None,
  'countmin': 1.0,
  'key': 'name',
  'name': 'Dropbox',
  'refresh': 3.0,
  'regex': True,
  'result': None,
  'timer': 2.713984966278076}, ...]
cloud         [NA]
connections   [NA]
containers    [OK]    0.11627s key=name
[{'command': '/init',
  'cpu_percent': 99.66223325062035,
  'created': '2025-10-31T08:27:30.896378049Z',
  'engine': 'docker',
  'id': 'bc4182f99ce9f65ffd0297b0e529781062f2fb8db7a3b073a880862e2434aac8',
  'image': ('thomx/fr24feed-piaware:latest',),
  'io_rx': 0,
  'io_wx': 0,
  'key': 'name',
  'memory_inactive_file': 2269184,
  'memory_limit': 201326592,
  'memory_percent': None,
  'memory_usage': 73932800,
  'name': 'adsb-feeder',
  'network_rx': 87,
  'network_tx': 158,
  'status': 'running',
  'uptime': '2 hours'}, ...]
core          [OK]    0.00054s
{'log': 4, 'phys': 4}
cpu           [OK]    0.00055s
{'cpucore': 4,
 'ctx_switches': 0,
 'ctx_switches_gauge': 946145740,
 'ctx_switches_rate_per_sec': 0,
 'guest': 0.0,
 'idle': 63.9,
 'interrupts': 0,
 'interrupts_gauge': 557908767,
 'interrupts_rate_per_sec': 0,
 'iowait': 0.0,
 'irq': 0.0,
 'nice': 0.0,
 'soft_interrupts': 0,
 'soft_interrupts_gauge': 484043897,
 'soft_interrupts_rate_per_sec': 0,
 'steal': 0.0,
 'syscalls': 0,
 'syscalls_gauge': 0,
 'syscalls_rate_per_sec': 0,
 'system': 11.6,
 'time_since_update': 2.8288204669952393,
 'total': 36.1,
 'user': 24.4}
diskio        [OK]    0.00053s key=disk_name
[{'disk_name': 'sda',
  'key': 'disk_name',
  'read_bytes': 0,
  'read_bytes_gauge': 6556552704,
  'read_bytes_rate_per_sec': 0,
  'read_count': 0,
  'read_count_gauge': 502618,
  'read_count_rate_per_sec': 0,
  'time_since_update': 2.8277170658111572,
  'write_bytes': 0,
  'write_bytes_gauge': 57205437440,
  'write_bytes_rate_per_sec': 0,
  'write_count': 0,
  'write_count_gauge': 2614485,
  'write_count_rate_per_sec': 0}, ...]
folders       [OK]    0.00003s
[]
fs            [OK]    0.00061s key=mnt_point
[{'device_name': '/dev/sda2',
  'free': 419151245312,
  'fs_type': 'ext4',
  'key': 'mnt_point',
  'mnt_point': '/etc/resolv.conf',
  'options': 'rw,relatime,errors=remount-ro',
  'percent': 9.0,
  'size': 485274771456,
  'used': 41397739520}, ...]
gpu           [OK]    0.00003s
[]
help          [OK]    0.00000s
None
ip            [OK]    0.00004s
{}
irq           [NA]
load          [OK]    0.00003s
{'cpucore': 4, 'min1': 5.7265625, 'min15': 3.73828125, 'min5': 4.8408203125}
mem           [OK]    0.00025s
{'active': 5876953088,
 'available': 12583145472,
 'buffers': 1471012864,
 'cached': 10475098112,
 'free': 12583145472,
 'inactive': 7288700928,
 'percent': 23.8,
 'shared': 16314368,
 'total': 16506163200,
 'used': 3923017728}
memswap       [OK]    0.00028s
{'free': 25156845568,
 'percent': 0.0,
 'sin': 2704412672,
 'sout': 4576780288,
 'time_since_update': 2.830570936203003,
 'total': 25158217728,
 'used': 1372160}
network       [OK]    0.00424s key=interface_name
[{'alias': None,
  'bytes_all': 200,
  'bytes_all_gauge': 1879462724,
  'bytes_all_rate_per_sec': 93.0,
  'bytes_recv': 100,
  'bytes_recv_gauge': 939731362,
  'bytes_recv_rate_per_sec': 46.0,
  'bytes_sent': 100,
  'bytes_sent_gauge': 939731362,
  'bytes_sent_rate_per_sec': 46.0,
  'interface_name': 'lo',
  'key': 'interface_name',
  'speed': 0,
  'time_since_update': 2.1296961307525635}, ...]
now           [OK]    0.00004s
{'custom': '2025-11-02 15:56:53 CET', 'iso': '2025-11-02T15:56:53+01:00'}
percpu        [OK]    0.00040s key=cpu_number
[{'cpu_number': 0,
  'dpc': None,
  'guest': 0.0,
  'guest_nice': 0.0,
  'idle': 83.2,
  'interrupt': None,
  'iowait': 0.0,
  'irq': 0.0,
  'key': 'cpu_number',
  'nice': 0.0,
  'softirq': 0.0,
  'steal': 0.0,
  'system': 4.6,
  'total': 16.8,
  'user': 12.3}, ...]
ports         [OK]    0.00001s
[]
processcount  [OK]    0.26196s
{'pid_max': 0, 'running': 2, 'sleeping': 322, 'thread': 1466, 'total': 384}
processlist   [OK]    0.00024s
[]
programlist   [OK]    0.00386s
[]
psutilversion [OK]    0.00004s
'7.0.0'
quicklook     [OK]    0.00053s
{'cpu': 36.1,
 'cpu_hz': 3600000000.0,
 'cpu_hz_current': 2900009749.9999995,
 'cpu_log_core': 4,
 'cpu_name': 'Intel(R) N150',
 'cpu_phys_core': 4,
 'load': 93.2,
 'mem': 23.8,
 'percpu': [{...}, {...}, {...}, {...}],
 'swap': 0.0}
raid          [NA]
sensors       [OK]    0.00001s key=label
[{'critical': 105,
  'key': 'label',
  'label': 'Core 0',
  'type': 'temperature_core',
  'unit': 'C',
  'value': 63,
  'warning': 105}, ...]
smart         [NA]
system        [OK]    0.00001s
{'hostname': 'mcp',
 'hr_name': 'Alpine Linux 3.22.0 64bit / Linux 6.12.48+deb13-amd64',
 'linux_distro': 'Alpine Linux 3.22.0',
 'os_name': 'Linux',
 'os_version': '6.12.48+deb13-amd64',
 'platform': '64bit'}
uptime        [OK]    0.00020s
{'seconds': 284218}
version       [OK]    0.00002s
'4.3.3'
vms           [NA]
wifi          [OK]    0.00015s
[]
===============================================================================
Total time to update all stats: 0.39467s
===============================================================================

Additional context
Add any other context about the problem here.

[bondskin]

Hi @nicolargo , thanks for the nudging and moving my topic to a discussion.
I still feel lost, sorry.
I read the documentation, I searched and also was looking at your Google forum, but no luck.

May be it is hidden in plain sight, but I don't understand why I am getting "Invalid HTTP request received." through a reverse proxy (SWAG).

INFO: Started server process [3707641]
INFO: Waiting for application startup.
INFO: Application startup complete.
INFO: Uvicorn running on http://0.0.0.0:61208/ (Press CTRL+C to quit)
WARNING: Invalid HTTP request received.
WARNING: Invalid HTTP request received.
WARNING: Invalid HTTP request received.

Accessing glances from within the SWAG container works
❯ docker exec -it swag curl -v http://192.168.2.11:61208

• Trying 192.168.2.11:61208...
• Connected to 192.168.2.11 (192.168.2.11) port 61208
• using HTTP/1.x

GET / HTTP/1.1
Host: 192.168.2.11:61208
User-Agent: curl/8.14.1
Accept: /

• Request completely sent off
  < HTTP/1.1 200 OK
  < date: Mon, 03 Nov 2025 08:37:29 GMT
  < server: uvicorn
  < content-length: 490
  < content-type: text/html; charset=utf-8

[nicolargo]

Hi @bondskin

sorry but i did not know Swap. Is it using Nginx as reverse proxy ?

If yes, what's your Nginx configuration ?

[bondskin]

No problem, I appreciate your support and swift responses.
proxy conf:

## Version 2025/07/18
# make sure that your glances container is named glances
# make sure that your dns has a cname set for glances

server {
    listen 443 ssl;
#    listen 443 quic;
    listen [::]:443 ssl;
#    listen [::]:443 quic;

    server_name glances.*;

    include /config/nginx/ssl.conf;

    client_max_body_size 0;

    # enable for Authelia (requires authelia-location.conf in the location block)
    #include /config/nginx/authelia-server.conf;

    location / {

        # enable for Authelia (requires authelia-server.conf in the server block)
        #include /config/nginx/authelia-location.conf;


        include /config/nginx/proxy.conf;
        include /config/nginx/resolver.conf;
        set $upstream_app mcp.ip;
        set $upstream_port 61208;
        set $upstream_proto http;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;

    }
}

Are the additional conf files (ssl, proxy) also relevant?

[nicolargo]

I use to make it work with the following Nginx configuration: https://github.com/nicolargo/glances/wiki/Reverse-proxy-to-the-Glances-Web-UI#nginx

[bondskin]

Thank you so much, it works as expected.