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Open
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Nunction opened this issue May 30, 2025 · 2 comments
Open
4 tasks done

buildctl attempts to use configured HTTP_PROXY/HTTPS_PROXY for local unix:// address #6002

Nunction opened this issue May 30, 2025 · 2 comments
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@Nunction
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Contributing guidelines and issue reporting guide

Well-formed report checklist

  • I have found a bug that the documentation does not mention anything about my problem
  • I have found a bug that there are no open or closed issues that are related to my problem
  • I have provided version/information about my environment and done my best to provide a reproducer

Description of bug

Bug description

It seems that buildctl now attempts to to use the configured proxy for connections to unix:// addresses which results in proxy errors as they can not reach a local socket address. I am not sure if a unix:// could ever be reached via proxy and this is intended behavior but I would assume that the proxy should only be used for tcp:// style addresses.

Reproduction

Running buildctl with a configured proxy results in an error response from the proxy being printed with it being unable to find the requested address.

# export BUILDKIT_HOST=unix:///run/buildkit/buildkitd.sock
# export HTTP_PROXY=http://proxy.example.com:3128
# export HTTPS_PROXY=http://proxy.example.com:3128
# export http_proxy=http://proxy.example.com:3128
# export https_proxy=http://proxy.example.com:3128
# buildctl debug workers

error: failed to list workers: Unavailable: connection error: desc = "transport: Error while dialing: failed to do connect handshake, response: \"HTTP/1.1 503 Service Unavailable\\r\\nContent-Length: 3614\\r\\nContent-Language: en\\r\\nContent-Type: text/html;charset=utf-8\\r\\nDate: Fri, 30 May 2025 07:39:05 GMT\\r\\nMime-Version: 1.0\\r\\nServer: squid/3.5.27\\r\\nVary: Accept-Language\\r\\nX-Squid-Error: ERR_DNS_FAIL 0\\r\\n\\r\\n<!DOCTYPE html PUBLIC \\\"-//W3C//DTD HTML 4.01//EN\\\" \\\"http://www.w3.org/TR/html4/strict.dtd\\\">\\n<html><head>\\n<meta type=\\\"copyright\\\" content=\\\"Copyright (C) 1996-2017 The Squid Software Foundation and contributors\\\">\\n<meta http-equiv=\\\"Content-Type\\\" content=\\\"text/html; charset=utf-8\\\">\\n<title>ERROR: The requested URL could not be retrieved</title>\\n<style type=\\\"text/css\\\"><!-- \\n /*\\n * Copyright (C) 1996-2017 The Squid Software Foundation and contributors\\n *\\n * Squid software is distributed under GPLv2+ license and includes\\n * contributions from numerous individuals and organizations.\\n * Please see the COPYING and CONTRIBUTORS files for details.\\n */\\n\\n/*\\n Stylesheet for Squid Error pages\\n Adapted from design by Free CSS Templates\\n http://www.freecsstemplates.org\\n Released for free under a Creative Commons Attribution 2.5 License\\n*/\\n\\n/* Page basics */\\n* {\\n\\tfont-family: verdana, sans-serif;\\n}\\n\\nhtml body {\\n\\tmargin: 0;\\n\\tpadding: 0;\\n\\tbackground: #efefef;\\n\\tfont-size: 12px;\\n\\tcolor: #1e1e1e;\\n}\\n\\n/* Page displayed title area */\\n#titles {\\n\\tmargin-left: 15px;\\n\\tpadding: 10px;\\n\\tpadding-left: 100px;\\n\\tbackground: url('/squid-internal-static/icons/SN.png') no-repeat left;\\n}\\n\\n/* initial title */\\n#titles h1 {\\n\\tcolor: #000000;\\n}\\n#titles h2 {\\n\\tcolor: #000000;\\n}\\n\\n/* special event: FTP success page titles */\\n#titles ftpsuccess {\\n\\tbackground-color:#00ff00;\\n\\twidth:100%;\\n}\\n\\n/* Page displayed body content area */\\n#content {\\n\\tpadding: 10px;\\n\\tbackground: #ffffff;\\n}\\n\\n/* General text */\\np {\\n}\\n\\n/* error brief description */\\n#error p {\\n}\\n\\n/* some data which may have caused the problem */\\n#data {\\n}\\n\\n/* the error message received from the system or other software */\\n#sysmsg {\\n}\\n\\npre {\\n    font-family:sans-serif;\\n}\\n\\n/* special event: FTP / Gopher directory listing */\\n#dirmsg {\\n    font-family: courier;\\n    color: black;\\n    font-size: 10pt;\\n}\\n#dirlisting {\\n    margin-left: 2%;\\n    margin-right: 2%;\\n}\\n#dirlisting tr.entry td.icon,td.filename,td.size,td.date {\\n    border-bottom: groove;\\n}\\n#dirlisting td.size {\\n    width: 50px;\\n    text-align: right;\\n    padding-right: 5px;\\n}\\n\\n/* horizontal lines */\\nhr {\\n\\tmargin: 0;\\n}\\n\\n/* page displayed footer area */\\n#footer {\\n\\tfont-size: 9px;\\n\\tpadding-left: 10px;\\n}\\n\\n\\nbody\\n:lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; }\\n:lang(he) { direction: rtl; }\\n --></style>\\n</head><body id=ERR_DNS_FAIL>\\n<div id=\\\"titles\\\">\\n<h1>ERROR</h1>\\n<h2>The requested URL could not be retrieved</h2>\\n</div>\\n<hr>\\n\\n<div id=\\\"content\\\">\\n<p>The following error was encountered while trying to retrieve the URL: <a href=\\\"https://http/1.1/*\\\">https://http/1.1/*</a></p>\\n\\n<blockquote id=\\\"error\\\">\\n<p><b>Unable to determine IP address from host name <q>http/1.1</q></b></p>\\n</blockquote>\\n\\n<p>The DNS server returned:</p>\\n<blockquote id=\\\"data\\\">\\n<pre>Name Error: The domain name does not exist.</pre>\\n</blockquote>\\n\\n<p>This means that the cache was not able to resolve the hostname presented in the URL. Check if the address is correct.</p>\\n\\n<p>Your cache administrator is <a href=\\\"mailto:REDACTED">noc@REDACTED</a>.</p>\\n<br>\\n</div>\\n\\n<hr>\\n<div id=\\\"footer\\\">\\n<p>Generated Fri, 30 May 2025 07:39:05 GMT by REDACTED (squid/3.5.27)</p>\\n<!-- ERR_DNS_FAIL **-->\\n</div>\\n</body></html>\\n\""

As a workaround / as verification that it is proxy related:
Setting .sock as a no proxy domain results in buildctl functioning like normal.

# export NO_PROXY=".sock"
# export no_proxy=".sock"

Version information

moby/buildkit@sha256:bd26cba1017fc236480bc4ecc0da799a6ad550d481c50bafe5fb468bd50c83a5

BuildKit: github.com/moby/buildkit ab80544 ab80544b39204300712c4415a0f8722ceee033c3

According to our CI pipelines this change was introduced sometime after:

BuildKit: github.com/moby/buildkit 7a94b80 7a94b8034f2a897c8450a2c7642f91d11f104bf9
@tonistiigi
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🤔

I can't reproduce this.

/src # env
BUILDKIT_CNI_INIT_LOCK_PATH=/run/buildkit_cni_bridge.lock
HTTPS_PROXY=http://proxy.example.com:3128
BUILDKIT_HOST=unix:///run/buildkit/buildkitd.sock
CGO_ENABLED=0
HOSTNAME=be7a7f787373
SHLVL=1
HOME=/root
GOTOOLCHAIN=local
GOFLAGS=-mod=vendor
https_proxy=http://proxy.example.com:3128
http_proxy=http://proxy.example.com:3128
TERM=xterm
BUILDKIT_RUN_NETWORK_INTEGRATION_TESTS=1
PATH=/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
GOTESTSUM_FORMAT=standard-verbose
GOPATH=/go
BUILDKIT_SETUP_CGROUPV2_ROOT=1
BUILDKIT_INTEGRATION_ROOTLESS_IDPAIR=1000:1000
BUILDKIT_INTEGRATION_SNAPSHOTTER=stargz
PWD=/src
BUILDKIT_REGISTRY_MIRROR_DIR=/root/.cache/registry
HTTP_PROXY=http://proxy.example.com:3128
GOLANG_VERSION=1.24.3
/src # buildctl debug workers
ID                              PLATFORMS
p17cnvfj1ulhwfkcbo1suapyi       linux/arm64,linux/amd64,linux/amd64/v2,linux/riscv64,linux/ppc64le,linux/s390x,linux/386,linux/mips64le,linux/arm/v7,linux/arm/v6

@Nunction
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Nunction commented Jun 1, 2025 •
edited
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Hi,
yeah just tried to reproduce it outside of our CI environment (GitLab runner + Docker) and it seems to take a weird combination of settings; I need to investigate a bit further what triggers it but the following compose produces the same behaviour on my personal machine (WSL + Docker):

compose.yml

networks:
  default:

services:
  proxy:
    image: ubuntu/squid
    networks:
      - default
    expose:
      - 3128

  buildkit:
    image: moby/buildkit@sha256:bd26cba1017fc236480bc4ecc0da799a6ad550d481c50bafe5fb468bd50c83a5
    privileged: true
    networks:
      - default
    environment:
      - HTTP_PROXY=http://proxy:3128
      - HTTPS_PROXY=http://proxy:3128
      - http_proxy=http://proxy:3128
      - https_proxy=http://proxy:3128
      - NO_PROXY=127.0.0.0/8,::1,localhost
      - no_proxy=127.0.0.0/8,::1,localhost
      - BUILDKIT_HOST=unix:///run/buildkit/buildkitd.sock
      - DOCKER_CONFIG=/root/.docker/
    volumes:
      - ./config.json:/root/.docker/config.json
    entrypoint: ["buildkitd"]
    command: ["--allow-insecure-entitlement=network.host", "--allow-insecure-entitlement=security.insecure", "--addr=unix:///run/buildkit/buildkitd.sock"]

config.json

{
  "proxies": {
    "default": {
      "httpProxy": "http://proxy:3128",
      "httpsProxy": "http://proxy:3128",
      "noProxy": "127.0.0.0/8,::1,localhost"
    }
  }
}

Exec:

# env
HTTPS_PROXY=http://proxy:3128
no_proxy=127.0.0.0/8,::1,localhost
BUILDKIT_HOST=unix:///run/buildkit/buildkitd.sock
HOSTNAME=0183b875d694
SHLVL=1
HOME=/root
NO_PROXY=127.0.0.0/8,::1,localhost
https_proxy=http://proxy:3128
http_proxy=http://proxy:3128
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
BUILDKIT_SETUP_CGROUPV2_ROOT=1
DOCKER_CONFIG=/root/.docker/
PWD=/
HTTP_PROXY=http://proxy:3128

# buildctl debug workers
error: failed to list workers: Unavailable: connection error: desc = "transport: Error while dialing: failed to do connect handshake, response: \"HTTP/1.1 400 Bad Request\\r\\nConnection: close\\r\\nContent-Length: 3325\\r\\nCache-Status: 58b85709dc2f\\r\\nContent-Language: en\\r\\nContent-Type: text/html;charset=utf-8\\r\\nDate: Sun, 01 Jun 2025 07:48:22 GMT\\r\\nMime-Version: 1.0\\r\\nServer: squid/6.10\\r\\nVary: Accept-Language\\r\\nVia: 1.1 58b85709dc2f (squid/6.10)\\r\\nX-Squid-Error: ERR_PROTOCOL_UNKNOWN 0\\r\\n\\r\\n<!DOCTYPE html PUBLIC \\\"-//W3C//DTD HTML 4.01//EN\\\" \\\"http://www.w3.org/TR/html4/strict.dtd\\\">\\n<html><head>\\n<meta type=\\\"copyright\\\" content=\\\"Copyright (C) 1996-2021 The Squid Software Foundation and contributors\\\">\\n<meta http-equiv=\\\"Content-Type\\\" content=\\\"text/html; charset=utf-8\\\">\\n<title>ERROR: The requested URL could not be retrieved</title>\\n<style type=\\\"text/css\\\"><!-- \\n /*\\n * Copyright (C) 1996-2023 The Squid Software Foundation and contributors\\n *\\n * Squid software is distributed under GPLv2+ license and includes\\n * contributions from numerous individuals and organizations.\\n * Please see the COPYING and CONTRIBUTORS files for details.\\n */\\n\\n/*\\n Stylesheet for Squid Error pages\\n Adapted from design by Free CSS Templates\\n http://www.freecsstemplates.org\\n Released for free under a Creative Commons Attribution 2.5 License\\n*/\\n\\n/* Page basics */\\n* {\\n\\tfont-family: verdana, sans-serif;\\n}\\n\\nhtml body {\\n\\tmargin: 0;\\n\\tpadding: 0;\\n\\tbackground: #efefef;\\n\\tfont-size: 12px;\\n\\tcolor: #1e1e1e;\\n}\\n\\n/* Page displayed title area */\\n#titles {\\n\\tmargin-left: 15px;\\n\\tpadding: 10px;\\n\\tpadding-left: 100px;\\n\\tbackground: url('/squid-internal-static/icons/SN.png') no-repeat left;\\n}\\n\\n/* initial title */\\n#titles h1 {\\n\\tcolor: #000000;\\n}\\n#titles h2 {\\n\\tcolor: #000000;\\n}\\n\\n/* special event: FTP success page titles */\\n#titles ftpsuccess {\\n\\tbackground-color:#00ff00;\\n\\twidth:100%;\\n}\\n\\n/* Page displayed body content area */\\n#content {\\n\\tpadding: 10px;\\n\\tbackground: #ffffff;\\n}\\n\\n/* General text */\\np {\\n}\\n\\n/* error brief description */\\n#error p {\\n}\\n\\n/* some data which may have caused the problem */\\n#data {\\n}\\n\\n/* the error message received from the system or other software */\\n#sysmsg {\\n}\\n\\npre {\\n}\\n\\n/* special event: FTP directory listing */\\n#dirmsg {\\n    font-family: courier, monospace;\\n    color: black;\\n    font-size: 10pt;\\n}\\n#dirlisting {\\n    margin-left: 2%;\\n    margin-right: 2%;\\n}\\n#dirlisting tr.entry td.icon,td.filename,td.size,td.date {\\n    border-bottom: groove;\\n}\\n#dirlisting td.size {\\n    width: 50px;\\n    text-align: right;\\n    padding-right: 5px;\\n}\\n\\n/* horizontal lines */\\nhr {\\n\\tmargin: 0;\\n}\\n\\n/* page displayed footer area */\\n#footer {\\n\\tfont-size: 9px;\\n\\tpadding-left: 10px;\\n}\\n\\n\\nbody\\n:lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; }\\n:lang(he) { direction: rtl; }\\n --></style>\\n</head><body id=ERR_PROTOCOL_UNKNOWN>\\n<div id=\\\"titles\\\">\\n<h1>ERROR</h1>\\n<h2>The requested URL could not be retrieved</h2>\\n</div>\\n<hr>\\n\\n<div id=\\\"content\\\">\\n<p>The following error was encountered while trying to retrieve the URL: <a href=\\\"error:invalid-request\\\">error:invalid-request</a></p>\\n\\n<blockquote id=\\\"error\\\">\\n<p><b>Unsupported Protocol</b></p>\\n</blockquote>\\n\\n<p>Squid does not support some access protocols. For example, the SSH protocol is currently not supported.</p>\\n\\n<p>Your cache administrator is <a href=\\\"mailto:webmaster?subject=CacheErrorInfo%20-%20ERR_PROTOCOL_UNKNOWN&amp;body=CacheHost%3A%2058b85709dc2f%0D%0AErrPage%3A%20ERR_PROTOCOL_UNKNOWN%0D%0AErr%3A%20%5Bnone%5D%0D%0ATimeStamp%3A%20Sun,%2001%20Jun%202025%2007%3A48%3A22%20GMT%0D%0A%0D%0AClientIP%3A%20172.24.0.3%0D%0A%0D%0AHTTP%20Request%3A%0D%0A%0D%0A%0D%0A\\\">webmaster</a>.</p>\\n<br>\\n</div>\\n\\n<hr>\\n<div id=\\\"footer\\\">\\n<p>Generated Sun, 01 Jun 2025 07:48:22 GMT by 58b85709dc2f (squid/6.10)</p>\\n<!-- ERR_PROTOCOL_UNKNOWN -->\\n</div>\\n</body></html>\\n\""

# export NO_PROXY=.sock
/ # buildctl debug workers
ID                              PLATFORMS
tfvodji57427800saagxnze0u       linux/amd64,linux/amd64/v2,linux/amd64/v3,linux/arm64,linux/riscv64,linux/ppc64le,linux/s390x,linux/386,linux/arm/v7,linux/arm/v6

Squid log:

2025/06/01 07:33:00| Processing Configuration File: /etc/squid/squid.conf (depth 0)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/debian.conf (depth 1)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/rock.conf (depth 1)  
2025/06/01 07:33:00| Created PID file (/run/squid.pid)
2025/06/01 07:33:00| Set Current Directory to /var/spool/squid
2025/06/01 07:33:00| Creating missing swap directories
2025/06/01 07:33:00| No cache_dir stores are configured.
2025/06/01 07:33:00| Removing PID file (/run/squid.pid)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/squid.conf (depth 0)        
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/debian.conf (depth 1)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/rock.conf (depth 1)  
2025/06/01 07:33:00| Created PID file (/run/squid.pid)
2025/06/01 07:33:00| Set Current Directory to /var/spool/squid
2025/06/01 07:33:00| Creating missing swap directories
2025/06/01 07:33:00| No cache_dir stores are configured.
2025/06/01 07:33:00| Removing PID file (/run/squid.pid)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/squid.conf (depth 0)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/debian.conf (depth 1)
2025/06/01 07:33:00| Processing Configuration File: /etc/squid/conf.d/rock.conf (depth 1)
2025/06/01 07:33:00| Created PID file (/run/squid.pid)
2025/06/01 07:33:00| Set Current Directory to /var/spool/squid
2025/06/01 07:33:00| Starting Squid Cache version 6.10 for x86_64-pc-linux-gnu...
2025/06/01 07:33:00| Service Name: squid
2025/06/01 07:33:00| Process ID 40
2025/06/01 07:33:00| Process Roles: master worker
2025/06/01 07:33:00| With 1024 file descriptors available
2025/06/01 07:33:00| Initializing IP Cache...
2025/06/01 07:33:00| DNS IPv6 socket created at [::], FD 8
2025/06/01 07:33:00| DNS IPv4 socket created at 0.0.0.0, FD 9
2025/06/01 07:33:00| Adding nameserver 127.0.0.11 from /etc/resolv.conf
2025/06/01 07:33:00| Adding ndots 1 from /etc/resolv.conf
2025/06/01 07:33:00| Logfile: opening log daemon:/var/log/squid/access.log
2025/06/01 07:33:00| Logfile Daemon: opening log /var/log/squid/access.log
2025/06/01 07:33:00| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec
2025/06/01 07:33:00| Store logging disabled
2025/06/01 07:33:00| Swap maxSize 0 + 262144 KB, estimated 20164 objects
2025/06/01 07:33:00| Target number of buckets: 1008
2025/06/01 07:33:00| Using 8192 Store buckets
2025/06/01 07:33:00| Max Mem  size: 262144 KB
2025/06/01 07:33:00| Max Swap size: 0 KB
2025/06/01 07:33:00| Using Least Load store dir selection
2025/06/01 07:33:00| Set Current Directory to /var/spool/squid
2025/06/01 07:33:00| Finished loading MIME types and icons.
2025/06/01 07:33:00| HTCP Disabled.
2025/06/01 07:33:00| Pinger socket opened on FD 14
2025/06/01 07:33:00| Squid plugin modules loaded: 0
2025/06/01 07:33:00| Adaptation support is off.
2025/06/01 07:33:00| Accepting HTTP Socket connections at conn3 local=[::]:3128 remote=[::] FD 12 flags=9
    listening port: 3128
2025/06/01 07:33:00 pinger| Initialising ICMP pinger ...
2025/06/01 07:33:00 pinger| ICMP socket opened.
2025/06/01 07:33:00 pinger| ICMPv6 socket opened
2025/06/01 07:33:01| storeLateRelease: released 0 objects
1748764078.089      0 172.24.0.3 NONE_NONE/400 3657 - error:invalid-request - HIER_NONE/- text/html
1748764102.672      0 172.24.0.3 NONE_NONE/400 3657 - error:invalid-request - HIER_NONE/- text/html

EDIT:

Also seems to happen if I don't mount the config.json

# ls -al /root
total 12
drwx------    1 root     root          4096 Jun  1 07:59 .
drwxr-xr-x    1 root     root          4096 Jun  1 07:59 ..
-rw-------    1 root     root            36 Jun  1 08:00 .ash_history

# env
HTTPS_PROXY=http://proxy:3128
no_proxy=127.0.0.0/8,::1,localhost
BUILDKIT_HOST=unix:///run/buildkit/buildkitd.sock
HOSTNAME=be6207419124
SHLVL=1
HOME=/root
NO_PROXY=127.0.0.0/8,::1,localhost
https_proxy=http://proxy:3128
http_proxy=http://proxy:3128
TERM=xterm
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
BUILDKIT_SETUP_CGROUPV2_ROOT=1
DOCKER_CONFIG=/root/.docker/
PWD=/
HTTP_PROXY=http://proxy:3128

# buildctl debug workers
error: failed to list workers: Unavailable: connection error: desc = "transport: Error while dialing: failed to do connect handshake, response: \"HTTP/1.1 400 Bad Request\\r\\nConnection: close\\r\\nContent-Length: 3325\\r\\nCache-Status: 58b85709dc2f\\r\\nContent-Language: en\\r\\nContent-Type: text/html;charset=utf-8\\r\\nDate: Sun, 01 Jun 2025 07:59:56 GMT\\r\\nMime-Version: 1.0\\r\\nServer: squid/6.10\\r\\nVary: Accept-Language\\r\\nVia: 1.1 58b85709dc2f (squid/6.10)\\r\\nX-Squid-Error: ERR_PROTOCOL_UNKNOWN 0\\r\\n\\r\\n<!DOCTYPE html PUBLIC \\\"-//W3C//DTD HTML 4.01//EN\\\" \\\"http://www.w3.org/TR/html4/strict.dtd\\\">\\n<html><head>\\n<meta type=\\\"copyright\\\" content=\\\"Copyright (C) 1996-2021 The Squid Software Foundation and contributors\\\">\\n<meta http-equiv=\\\"Content-Type\\\" content=\\\"text/html; charset=utf-8\\\">\\n<title>ERROR: The requested URL could not be retrieved</title>\\n<style type=\\\"text/css\\\"><!-- \\n /*\\n * Copyright (C) 1996-2023 The Squid Software Foundation and contributors\\n *\\n * Squid software is distributed under GPLv2+ license and includes\\n * contributions from numerous individuals and organizations.\\n * Please see the COPYING and CONTRIBUTORS files for details.\\n */\\n\\n/*\\n Stylesheet for Squid Error pages\\n Adapted from design by Free CSS Templates\\n http://www.freecsstemplates.org\\n Released for free under a Creative Commons Attribution 2.5 License\\n*/\\n\\n/* Page basics */\\n* {\\n\\tfont-family: verdana, sans-serif;\\n}\\n\\nhtml body {\\n\\tmargin: 0;\\n\\tpadding: 0;\\n\\tbackground: #efefef;\\n\\tfont-size: 12px;\\n\\tcolor: #1e1e1e;\\n}\\n\\n/* Page displayed title area */\\n#titles {\\n\\tmargin-left: 15px;\\n\\tpadding: 10px;\\n\\tpadding-left: 100px;\\n\\tbackground: url('/squid-internal-static/icons/SN.png') no-repeat left;\\n}\\n\\n/* initial title */\\n#titles h1 {\\n\\tcolor: #000000;\\n}\\n#titles h2 {\\n\\tcolor: #000000;\\n}\\n\\n/* special event: FTP success page titles */\\n#titles ftpsuccess {\\n\\tbackground-color:#00ff00;\\n\\twidth:100%;\\n}\\n\\n/* Page displayed body content area */\\n#content {\\n\\tpadding: 10px;\\n\\tbackground: #ffffff;\\n}\\n\\n/* General text */\\np {\\n}\\n\\n/* error brief description */\\n#error p {\\n}\\n\\n/* some data which may have caused the problem */\\n#data {\\n}\\n\\n/* the error message received from the system or other software */\\n#sysmsg {\\n}\\n\\npre {\\n}\\n\\n/* special event: FTP directory listing */\\n#dirmsg {\\n    font-family: courier, monospace;\\n    color: black;\\n    font-size: 10pt;\\n}\\n#dirlisting {\\n    margin-left: 2%;\\n    margin-right: 2%;\\n}\\n#dirlisting tr.entry td.icon,td.filename,td.size,td.date {\\n    border-bottom: groove;\\n}\\n#dirlisting td.size {\\n    width: 50px;\\n    text-align: right;\\n    padding-right: 5px;\\n}\\n\\n/* horizontal lines */\\nhr {\\n\\tmargin: 0;\\n}\\n\\n/* page displayed footer area */\\n#footer {\\n\\tfont-size: 9px;\\n\\tpadding-left: 10px;\\n}\\n\\n\\nbody\\n:lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; }\\n:lang(he) { direction: rtl; }\\n --></style>\\n</head><body id=ERR_PROTOCOL_UNKNOWN>\\n<div id=\\\"titles\\\">\\n<h1>ERROR</h1>\\n<h2>The requested URL could not be retrieved</h2>\\n</div>\\n<hr>\\n\\n<div id=\\\"content\\\">\\n<p>The following error was encountered while trying to retrieve the URL: <a href=\\\"error:invalid-request\\\">error:invalid-request</a></p>\\n\\n<blockquote id=\\\"error\\\">\\n<p><b>Unsupported Protocol</b></p>\\n</blockquote>\\n\\n<p>Squid does not support some access protocols. For example, the SSH protocol is currently not supported.</p>\\n\\n<p>Your cache administrator is <a href=\\\"mailto:webmaster?subject=CacheErrorInfo%20-%20ERR_PROTOCOL_UNKNOWN&amp;body=CacheHost%3A%2058b85709dc2f%0D%0AErrPage%3A%20ERR_PROTOCOL_UNKNOWN%0D%0AErr%3A%20%5Bnone%5D%0D%0ATimeStamp%3A%20Sun,%2001%20Jun%202025%2007%3A59%3A56%20GMT%0D%0A%0D%0AClientIP%3A%20172.24.0.3%0D%0A%0D%0AHTTP%20Request%3A%0D%0A%0D%0A%0D%0A\\\">webmaster</a>.</p>\\n<br>\\n</div>\\n\\n<hr>\\n<div id=\\\"footer\\\">\\n<p>Generated Sun, 01 Jun 2025 07:59:56 GMT by 58b85709dc2f (squid/6.10)</p>\\n<!-- ERR_PROTOCOL_UNKNOWN -->\\n</div>\\n</body></html>\\n\""

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