Local Testing with NGINX Reverse Proxy

This guide provides scenario-based tests for ServiceControl instances behind an NGINX reverse proxy. Use this to verify:

SSL/TLS termination at the reverse proxy
Forwarded headers handling (X-Forwarded-For, X-Forwarded-Proto, X-Forwarded-Host)
HTTP to HTTPS redirection
HSTS (HTTP Strict Transport Security)
WebSocket support (SignalR)

Instance Reference

Instance	Project Directory	Default Port	Hostname	Environment Variable Prefix
ServiceControl (Primary)	`src\ServiceControl`	33333	`servicecontrol.localhost`	`SERVICECONTROL_`
ServiceControl.Audit	`src\ServiceControl.Audit`	44444	`servicecontrol-audit.localhost`	`SERVICECONTROL_AUDIT_`
ServiceControl.Monitoring	`src\ServiceControl.Monitoring`	33633	`servicecontrol-monitor.localhost`	`MONITORING_`

Prerequisites

Docker Desktop installed and running
mkcert for generating local development certificates
ServiceControl built locally (see main README for instructions)
curl (included with Windows 10/11, Git Bash, or WSL)

Enabling Debug Logs

To enable detailed logging for troubleshooting, set the LogLevel environment variable before starting each instance:

rem ServiceControl Primary
set SERVICECONTROL_LOGLEVEL=Debug

rem ServiceControl.Audit
set SERVICECONTROL_AUDIT_LOGLEVEL=Debug

rem ServiceControl.Monitoring
set MONITORING_LOGLEVEL=Debug

Valid log levels: Trace, Debug, Information (or Info), Warning (or Warn), Error, Critical (or Fatal), None (or Off)

Debug logs will show detailed request processing information including forwarded headers handling and HTTPS redirection.

Installing mkcert

Windows (using Chocolatey):

choco install mkcert

Windows (using Scoop):

scoop install mkcert

After installing, run mkcert -install to install the local CA in your system trust store.

Setup

Step 1: Create the Local Development Folder

Create a .local folder in the repository root (this folder is gitignored):

mkdir .local
mkdir .local\certs

Step 2: Generate SSL Certificates

Use mkcert to generate trusted local development certificates:

mkcert -install
cd .local\certs
mkcert -cert-file local-platform.pem -key-file local-platform-key.pem servicecontrol.localhost servicecontrol-audit.localhost servicecontrol-monitor.localhost localhost

Step 3: Create Docker Compose Configuration

Create .local/compose.yml:

services:
  reverse-proxy-servicecontrol:
    image: nginx:alpine
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
      - ./certs/local-platform.pem:/etc/nginx/certs/local.pem:ro
      - ./certs/local-platform-key.pem:/etc/nginx/certs/local-key.pem:ro

Step 4: Create NGINX Configuration

Create .local/nginx.conf:

events { worker_connections 1024; }

http {
    # WebSocket support: set connection to 'upgrade' if Upgrade header present
    map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
    }

    # Shared SSL Settings
    ssl_certificate     /etc/nginx/certs/local.pem;
    ssl_certificate_key /etc/nginx/certs/local-key.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;
    ssl_ciphers         HIGH:!aNULL:!MD5;

    # ServiceControl (Primary) - HTTPS
    server {
        listen 443 ssl;
        server_name servicecontrol.localhost;

        location / {
            proxy_pass http://host.docker.internal:33333;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }

    # ServiceControl (Primary) - HTTP (for testing HTTP-to-HTTPS redirect)
    server {
        listen 80;
        server_name servicecontrol.localhost;

        location / {
            proxy_pass http://host.docker.internal:33333;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }

    # ServiceControl.Audit - HTTPS
    server {
        listen 443 ssl;
        server_name servicecontrol-audit.localhost;

        location / {
            proxy_pass http://host.docker.internal:44444;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }

    # ServiceControl.Audit - HTTP (for testing HTTP-to-HTTPS redirect)
    server {
        listen 80;
        server_name servicecontrol-audit.localhost;

        location / {
            proxy_pass http://host.docker.internal:44444;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }

    # ServiceControl.Monitoring - HTTPS
    server {
        listen 443 ssl;
        server_name servicecontrol-monitor.localhost;

        location / {
            proxy_pass http://host.docker.internal:33633;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }

    # ServiceControl.Monitoring - HTTP (for testing HTTP-to-HTTPS redirect)
    server {
        listen 80;
        server_name servicecontrol-monitor.localhost;

        location / {
            proxy_pass http://host.docker.internal:33633;

            # WebSocket Support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

            # Forwarded Headers
            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_set_header X-Forwarded-Host $host;
        }
    }
}

Step 5: Configure Hosts File

Add the following entries to your hosts file (C:\Windows\System32\drivers\etc\hosts):

127.0.0.1 servicecontrol.localhost
127.0.0.1 servicecontrol-audit.localhost
127.0.0.1 servicecontrol-monitor.localhost

Step 6: Start the NGINX Reverse Proxy

From the repository root:

docker compose -f .local/compose.yml up -d

Step 7: Final Directory Structure

After completing the setup, your .local folder should look like:

.local/
├── compose.yml
├── nginx.conf
└── certs/
    ├── local-platform.pem
    └── local-platform-key.pem

Test Scenarios

Important: ServiceControl must be running before testing. A 502 Bad Gateway error means NGINX cannot reach ServiceControl. Note: Use TRUSTALLPROXIES=true for local Docker testing. The NGINX container's IP address varies based on Docker's network configuration (e.g., 172.x.x.x), making it impractical to specify a fixed KNOWNPROXIES value.

Scenario 1: HTTPS Access

Verify that HTTPS is working through the reverse proxy.

Clear environment variables and start ServiceControl:

set SERVICECONTROL_FORWARDEDHEADERS_ENABLED=
set SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES=
set SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS=
set SERVICECONTROL_HTTPS_PORT=
set SERVICECONTROL_HTTPS_ENABLEHSTS=

cd src\ServiceControl
dotnet run --no-launch-profile

Test with curl:

curl -k -v https://servicecontrol.localhost/api 2>&1 | findstr /C:"HTTP/"

Expected output:

< HTTP/1.1 200 OK

The request succeeds over HTTPS through the NGINX reverse proxy.

Scenario 2: Forwarded Headers Processing

Verify that forwarded headers are being processed correctly.

Clear environment variables and start ServiceControl:

set SERVICECONTROL_FORWARDEDHEADERS_ENABLED=true
set SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES=true
set SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS=
set SERVICECONTROL_HTTPS_PORT=
set SERVICECONTROL_HTTPS_ENABLEHSTS=

cd src\ServiceControl
dotnet run --no-launch-profile

Test with curl:

curl -k https://servicecontrol.localhost/debug/request-info | json

Expected output:

{
  "processed": {
    "scheme": "https",
    "host": "servicecontrol.localhost",
    "remoteIpAddress": "172.x.x.x"
  },
  "rawHeaders": {
    "xForwardedFor": "",
    "xForwardedProto": "",
    "xForwardedHost": ""
  },
  "configuration": {
    "enabled": true,
    "trustAllProxies": true,
    "knownProxies": [],
    "knownNetworks": []
  }
}

The key indicators that forwarded headers are working:

processed.scheme is https (from X-Forwarded-Proto)
processed.host is servicecontrol.localhost (from X-Forwarded-Host)
rawHeaders are empty because the middleware consumed them (trusted proxy)

Scenario 3: HTTP to HTTPS Redirect

Verify that HTTP requests are redirected to HTTPS.

Clear environment variables and start ServiceControl:

set SERVICECONTROL_FORWARDEDHEADERS_ENABLED=true
set SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES=true
set SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS=true
set SERVICECONTROL_HTTPS_PORT=443
set SERVICECONTROL_HTTPS_ENABLEHSTS=

cd src\ServiceControl
dotnet run --no-launch-profile

Test with curl:

curl -v http://servicecontrol.localhost/api 2>&1 | findstr /i location

Expected output:

< Location: https://servicecontrol.localhost/api

HTTP requests are redirected to HTTPS with a 307 (Temporary Redirect) status.

Scenario 4: HSTS

Verify that the HSTS header is included in HTTPS responses.

Note: HSTS is disabled in Development environment. You must use --no-launch-profile to prevent launchSettings.json from overriding it.

Clear environment variables and start ServiceControl:

set SERVICECONTROL_FORWARDEDHEADERS_ENABLED=true
set SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES=true
set SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS=
set SERVICECONTROL_HTTPS_PORT=
set SERVICECONTROL_HTTPS_ENABLEHSTS=true

cd src\ServiceControl
dotnet run --environment Production --no-launch-profile

Test with curl:

curl -k -v https://servicecontrol.localhost/api 2>&1 | findstr /i strict-transport-security

Expected output:

< Strict-Transport-Security: max-age=31536000

The HSTS header is present with the default max-age of 1 year.

Testing Other Instances

The scenarios above use ServiceControl (Primary). To test ServiceControl.Audit or ServiceControl.Monitoring:

Use the appropriate environment variable prefix (see Configuration Reference below)
Use the corresponding project directory and hostname

Instance	Project Directory	Hostname	Env Var Prefix
ServiceControl (Primary)	`src\ServiceControl`	`servicecontrol.localhost`	`SERVICECONTROL_`
ServiceControl.Audit	`src\ServiceControl.Audit`	`servicecontrol-audit.localhost`	`SERVICECONTROL_AUDIT_`
ServiceControl.Monitoring	`src\ServiceControl.Monitoring`	`servicecontrol-monitor.localhost`	`MONITORING_`

Configuration Reference

Environment Variable	Default	Description
`{PREFIX}_FORWARDEDHEADERS_ENABLED`	`true`	Enable forwarded headers processing
`{PREFIX}_FORWARDEDHEADERS_TRUSTALLPROXIES`	`true`	Trust all proxies
`{PREFIX}_FORWARDEDHEADERS_KNOWNPROXIES`	-	Comma-separated list of trusted proxy IPs
`{PREFIX}_FORWARDEDHEADERS_KNOWNNETWORKS`	-	Comma-separated list of trusted CIDR ranges
`{PREFIX}_HTTPS_REDIRECTHTTPTOHTTPS`	`false`	Redirect HTTP to HTTPS
`{PREFIX}_HTTPS_PORT`	-	HTTPS port for redirect
`{PREFIX}_HTTPS_ENABLEHSTS`	`false`	Enable HSTS
`{PREFIX}_HTTPS_HSTSMAXAGESECONDS`	`31536000`	HSTS max-age (1 year)
`{PREFIX}_HTTPS_HSTSINCLUDESUBDOMAINS`	`false`	Include subdomains in HSTS

Where {PREFIX} is:

SERVICECONTROL for ServiceControl (Primary)
SERVICECONTROL_AUDIT for ServiceControl.Audit
MONITORING for ServiceControl.Monitoring

Cleanup

Stop NGINX

docker compose -f .local/compose.yml down

Clear Environment Variables

After testing, clear the environment variables:

Command Prompt (cmd):

set SERVICECONTROL_FORWARDEDHEADERS_ENABLED=
set SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES=
set SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS=
set SERVICECONTROL_HTTPS_PORT=
set SERVICECONTROL_HTTPS_ENABLEHSTS=

PowerShell:

$env:SERVICECONTROL_FORWARDEDHEADERS_ENABLED = $null
$env:SERVICECONTROL_FORWARDEDHEADERS_TRUSTALLPROXIES = $null
$env:SERVICECONTROL_HTTPS_REDIRECTHTTPTOHTTPS = $null
$env:SERVICECONTROL_HTTPS_PORT = $null
$env:SERVICECONTROL_HTTPS_ENABLEHSTS = $null

Remove Hosts Entries (Optional)

If you no longer need the hostnames, remove these entries from your hosts file (C:\Windows\System32\drivers\etc\hosts):

127.0.0.1 servicecontrol.localhost
127.0.0.1 servicecontrol-audit.localhost
127.0.0.1 servicecontrol-monitor.localhost

Troubleshooting

502 Bad Gateway

This error means NGINX cannot reach ServiceControl. Check:

ServiceControl is running (dotnet run in the appropriate project directory)
ServiceControl is accessible directly: curl http://localhost:33333/api
Docker Desktop is running and host.docker.internal resolves correctly

"Connection refused" errors

Ensure ServiceControl instances are running and listening on the expected ports:

ServiceControl (Primary): 33333
ServiceControl.Audit: 44444
ServiceControl.Monitoring: 33633

Headers not being applied

Verify FORWARDEDHEADERS_ENABLED is true
Verify FORWARDEDHEADERS_TRUSTALLPROXIES is true (for local Docker testing)
Use the /debug/request-info endpoint to check current settings

Certificate errors in browser

Ensure mkcert's root CA is installed: mkcert -install
Restart your browser after installing the root CA

Docker networking issues

If using Docker Desktop on Windows with WSL2:

Ensure host.docker.internal resolves correctly
Check that the ServiceControl ports are not blocked by Windows Firewall

Debug endpoint not available

The /debug/request-info endpoint is only available when running in Development environment (the default when using dotnet run).

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Local Testing with NGINX Reverse Proxy

Instance Reference

Prerequisites

Enabling Debug Logs

Installing mkcert

Setup

Step 1: Create the Local Development Folder

Step 2: Generate SSL Certificates

Step 3: Create Docker Compose Configuration

Step 4: Create NGINX Configuration

Step 5: Configure Hosts File

Step 6: Start the NGINX Reverse Proxy

Step 7: Final Directory Structure

Test Scenarios

Scenario 1: HTTPS Access

Scenario 2: Forwarded Headers Processing

Scenario 3: HTTP to HTTPS Redirect

Scenario 4: HSTS

Testing Other Instances

Configuration Reference

Cleanup

Stop NGINX

Clear Environment Variables

Remove Hosts Entries (Optional)

Troubleshooting

502 Bad Gateway

"Connection refused" errors

Headers not being applied

Certificate errors in browser

Docker networking issues

Debug endpoint not available

See Also

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Local Testing with NGINX Reverse Proxy

Instance Reference

Prerequisites

Enabling Debug Logs

Installing mkcert

Setup

Step 1: Create the Local Development Folder

Step 2: Generate SSL Certificates

Step 3: Create Docker Compose Configuration

Step 4: Create NGINX Configuration

Step 5: Configure Hosts File

Step 6: Start the NGINX Reverse Proxy

Step 7: Final Directory Structure

Test Scenarios

Scenario 1: HTTPS Access

Scenario 2: Forwarded Headers Processing

Scenario 3: HTTP to HTTPS Redirect

Scenario 4: HSTS

Testing Other Instances

Configuration Reference

Cleanup

Stop NGINX

Clear Environment Variables

Remove Hosts Entries (Optional)

Troubleshooting

502 Bad Gateway

"Connection refused" errors

Headers not being applied

Certificate errors in browser

Docker networking issues

Debug endpoint not available

See Also