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Using reverse proxy for custom domains
Using reverse proxy for custom domains
Andy Kostenko avatar
Written by Andy Kostenko
Updated over a week ago provides a scalable infrastructure, which involves multiple IP addresses from around the world to serve your customers in a fastest way.

While we don't support running on customers' infrastructure, you can setup a simple reverse proxy between your clients and

You need to install nginx and apply this configuration to it:

# Generated by

user www-data;
pid /run/;
worker_processes auto;
worker_rlimit_nofile 65535;

# Load modules
include /etc/nginx/modules-enabled/*.conf;

events {
multi_accept on;
worker_connections 65535;

http {
charset utf-8;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
server_tokens off;
log_not_found off;
types_hash_max_size 2048;
types_hash_bucket_size 64;
client_max_body_size 16M;

include mime.types;
default_type application/octet-stream;

# Logging
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log warn;

ssl_session_timeout 1d;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;

# Diffie-Hellman parameter for DHE ciphersuites
ssl_dhparam /etc/nginx/dhparam.pem;

# Mozilla Intermediate configuration
ssl_protocols TLSv1.2 TLSv1.3;

# OCSP Stapling
ssl_stapling on;
ssl_stapling_verify on;
resolver valid=60s;
resolver_timeout 2s;

# Connection header for WebSocket reverse proxy
map $http_upgrade $connection_upgrade {
default upgrade;
"" close;

map $remote_addr $proxy_forwarded_elem {

# IPv4 addresses can be sent as-is
~^[0-9.]+$ "for=$remote_addr";

# IPv6 addresses need to be bracketed and quoted
~^[0-9A-Fa-f:.]+$ "for=\"[$remote_addr]\"";

# Unix domain socket names cannot be represented in RFC 7239 syntax
default "for=unknown";

map $http_forwarded $proxy_add_forwarded {

# If the incoming Forwarded header is syntactically valid, append to it
"~^(,[ \\t]*)*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*([ \\t]*,([ \\t]*([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?(;([!#$%&'*+.^_`|~0-9A-Za-z-]+=([!#$%&'*+.^_`|~0-9A-Za-z-]+|\"([\\t \\x21\\x23-\\x5B\\x5D-\\x7E\\x80-\\xFF]|\\\\[\\t \\x21-\\x7E\\x80-\\xFF])*\"))?)*)?)*$" "$http_forwarded, $proxy_forwarded_elem";

# Otherwise, replace it
default "$proxy_forwarded_elem";

# Load configs
include /etc/nginx/conf.d/*.conf;

server {
listen 80;
listen [::]:80;
listen 443 ssl;
listen [::]:443 ssl;

ssl_certificate /etc/nginx/ssl/;
ssl_certificate_key /etc/nginx/ssl/;

# security headers
add_header X-XSS-Protection "1; mode=block" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "no-referrer-when-downgrade" always;
add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline'; frame-ancestors 'self';" always;
add_header Permissions-Policy "interest-cohort=()" always;

# . files
location ~ /\.(?!well-known) {
deny all;

# reverse proxy
location / {
proxy_http_version 1.1;
proxy_cache_bypass $http_upgrade;

# Proxy headers
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Forwarded $proxy_add_forwarded;
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;
proxy_set_header X-Forwarded-Port $server_port;

# Proxy timeouts
proxy_connect_timeout 60s;
proxy_send_timeout 60s;
proxy_read_timeout 60s;

# favicon.ico
location = /favicon.ico {
log_not_found off;
access_log off;

# robots.txt
location = /robots.txt {
log_not_found off;
access_log off;

# gzip
gzip on;
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

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