License & Deployment Mix: 10 tools – 7 OSS, 3 commercial; all self-hosted (no SaaS).
This directory covers web servers and reverse proxies – the software that terminates HTTP(S), serves static and dynamic content, and load-balances or routes traffic to application backends.
What Web Servers Do
A web server (often deployed as a reverse proxy in front of app servers) handles:
- HTTP(S) termination – TLS, HTTP/2 and HTTP/3, virtual hosts, and certificate management (some with automatic ACME/Let’s Encrypt)
- Static content and caching – efficient file serving, compression, and response caching
- Reverse proxy and load balancing – routing, health checks, and balancing across upstream application instances
- Access control and rewriting – auth, rate limiting, redirects, and URL rewriting at the edge
The category ranges from long-established general-purpose servers to modern Go-based servers with automatic HTTPS, dedicated high-performance proxies and load balancers, and dynamic reverse proxies aimed at containerized environments. It is overwhelmingly open-source and self-hosted, with a few commercial high-performance options.
The information on these pages was researched by a combination of human review and large language models. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. Use this catalogue only as a starting point for your own research, and review any tool carefully against your own requirements before relying on it. Catalogue data version 2026.197.
Comparison
Core Capabilities
| Tool | HTTP/2 | HTTP/3 | Reverse Proxy | Load Balancing | TLS | Auto-HTTPS | WebSocket | gRPC |
|---|---|---|---|---|---|---|---|---|
| Apache | Yes (mod_http2) | No | Yes (mod_proxy) | Yes (mod_proxy_balancer) | Yes (mod_ssl) | No | Yes (mod_proxy_wstunnel) | Yes (via proxy) |
| Nginx | Yes | Yes (1.25+) | Yes | Yes (upstream) | Yes | No | Yes | Yes |
| Caddy | Yes | Yes | Yes | Yes (round_robin, least_conn, etc.) | Yes | Yes (ACME) | Yes | Yes |
| Lighttpd | Yes (1.4.59+) | No | Yes (mod_proxy) | Yes (round-robin, hash) | Yes (mod_openssl) | No | Yes (via proxy) | No |
| HAProxy | Yes | Yes (2.6+) | Yes (HTTP mode) | Yes (primary role) | Yes | No | Yes | Yes (2.0+) |
| Traefik | Yes | Yes (experimental) | Yes (primary role) | Yes (round_robin, wrr) | Yes | Yes (ACME) | Yes | Yes |
| OpenLiteSpeed | Yes | Yes (QUIC) | Yes | Yes (cluster) | Yes | No | Yes | No |
| Nginx Plus | Yes | Yes | Yes | Yes (advanced: zone sync) | Yes | No | Yes | Yes |
| LiteSpeed Enterprise | Yes | Yes (QUIC) | Yes | Yes (cluster, ADC) | Yes | No | Yes | No |
| IIS | Yes | Yes (Win 2022+) | Yes (ARR) | Yes (ARR + NLB) | Yes | No | Yes (8.0+) | Yes (via proxy) |
Best protocol support: Caddy (all protocols, auto-HTTPS), Nginx (all protocols, HTTP/3 in mainline), HAProxy (all protocols, enterprise LB)
Most limited: Lighttpd (no HTTP/3, no gRPC), Apache (no HTTP/3)
Static Content & Caching
| Tool | Static File Serving | Proxy Cache | Cache Purge | Compression | CDN Integration |
|---|---|---|---|---|---|
| Apache | Yes (primary) | Yes (mod_cache) | Manual (htcacheclean) | Yes (mod_deflate, mod_brotli) | Behind CDN |
| Nginx | Yes (primary) | Yes (proxy_cache) | Plus only (native); purge module (OSS) | Yes (gzip, brotli module) | Behind CDN |
| Caddy | Yes (file_server) | Plugin (caddy-cache) | Plugin-dependent | Yes (encode gzip, zstd) | Behind CDN |
| Lighttpd | Yes (primary) | No proxy cache | N/A | Yes (mod_deflate) | Behind CDN |
| HAProxy | No (error pages only) | Basic (1.8+) | No | Yes (compression filter) | In front of CDN origin |
| Traefik | No (proxy only) | No | N/A | Yes (compress middleware) | Behind CDN |
| OpenLiteSpeed | Yes (primary) | Yes (LSCache built-in) | Yes (tag-based purge) | Yes (gzip, brotli) | Behind CDN |
| Nginx Plus | Yes (primary) | Yes (proxy_cache) | Yes (native purge API) | Yes (gzip, brotli module) | Behind CDN |
| LiteSpeed Enterprise | Yes (primary) | Yes (LSCache built-in) | Yes (tag-based purge, crawler) | Yes (gzip, brotli) | Behind CDN |
| IIS | Yes (primary) | Yes (Output Caching) | Yes (API / PowerShell) | Yes (Dynamic Compression) | Behind CDN |
Best caching: LiteSpeed Enterprise / OLS (LSCache with tag-based purge), Nginx Plus (native cache purge API)
No caching: HAProxy (basic only), Traefik (no cache – proxy only)
Configuration & Management
| Tool | Config Format | Hot Reload | Dashboard | API | Config Validation |
|---|---|---|---|---|---|
| Apache | Directives (httpd.conf) | Yes (graceful) | No | No | Yes (apachectl -t) |
| Nginx | Block-based (nginx.conf) | Yes (reload signal) | No | No | Yes (nginx -t) |
| Caddy | Caddyfile / JSON | Yes (API reload) | No | Yes (REST admin) | Yes (caddy validate) |
| Lighttpd | Key-value (lighttpd.conf) | No (restart) | No | No | Yes (lighttpd -t) |
| HAProxy | Sections (haproxy.cfg) | Yes (hitless reload) | Yes (stats page) | Yes (Runtime API, Data Plane) | Yes (haproxy -c) |
| Traefik | YAML/TOML + providers | Yes (dynamic providers) | Yes (web UI) | Yes (REST API) | Yes (provider-validated) |
| OpenLiteSpeed | WebAdmin GUI | Yes (graceful restart) | Yes (WebAdmin) | No | Yes (config test) |
| Nginx Plus | Block-based (nginx.conf) | Yes (reload signal) | Yes (live dashboard) | Yes (Plus API) | Yes (nginx -t) |
| LiteSpeed Enterprise | WebAdmin GUI | Yes (graceful restart) | Yes (WebAdmin) | No | Yes (config test) |
| IIS | XML (applicationHost.config) | Yes (app pool recycle) | Yes (IIS Manager) | Yes (PowerShell / REST) | Yes (appcmd verify) |
Best management: Traefik (dynamic config, dashboard, REST API), Caddy (REST API, simple config), HAProxy (runtime API, stats)
Most basic: Lighttpd (no hot reload, no API, no dashboard)
Security Features
| Tool | WAF | Rate Limiting | IP ACL | Client Certs | ModSecurity |
|---|---|---|---|---|---|
| Apache | Yes (mod_security) | Yes (mod_ratelimit) | Yes (mod_authz_host) | Yes (mod_ssl) | Yes (native) |
| Nginx | Yes (ModSecurity connector) | Yes (limit_req, limit_conn) | Yes (allow/deny) | Yes (ssl_client_certificate) | Yes (dynamic module) |
| Caddy | No (coraza plugin) | Yes (rate_limit plugin) | Yes (remote_ip matcher) | Yes (tls client_auth) | No |
| Lighttpd | No | Yes (mod_evasive, limited) | Yes (mod_access) | Yes (mod_openssl) | No |
| HAProxy | No (basic ACLs) | Yes (stick-tables) | Yes (ACL rules) | Yes (ssl crt-list) | No |
| Traefik | No (middleware plugins) | Yes (rateLimit middleware) | Yes (ipAllowList) | Yes (tls.options) | No |
| OpenLiteSpeed | Yes (mod_security) | Yes (per-client throttle) | Yes (access control) | Yes | Yes (native) |
| Nginx Plus | Yes (ModSecurity, App Protect) | Yes (limit_req, limit_conn) | Yes (allow/deny) | Yes (ssl_client_certificate) | Yes (dynamic module) |
| LiteSpeed Enterprise | Yes (mod_security) | Yes (per-client throttle, anti-DDoS) | Yes (access control) | Yes | Yes (native) |
| IIS | Yes (via IP Security, URL Rewrite) | Yes (Dynamic IP Restrictions) | Yes (IP Address and Domain Restrictions) | Yes (IIS Client Certificate Mapping) | No |
Best security: Apache (native ModSecurity, full WAF), Nginx (ModSecurity connector, robust rate limiting), LiteSpeed Enterprise (built-in anti-DDoS)
Most limited WAF: Lighttpd, HAProxy, Traefik (no native WAF – rely on external solutions)
Authentication Proxy (Authentik)
Web servers integrate via forward-auth proxy patterns:
| Tool | Auth Mechanism | Authentik Pattern | Complexity |
|---|---|---|---|
| Apache | mod_auth_openidc / external auth | OIDC module or auth proxy via mod_authnz_external | Medium |
| Nginx | auth_request | auth_request to Authentik outpost; proxy_pass to /outpost.goauthentik.io | Low |
| Caddy | forward_auth | forward_auth directive to Authentik outpost endpoint | Low |
| Lighttpd | External auth (limited) | Reverse proxy to Authentik; no native auth_request equivalent | High |
| HAProxy | Lua / external auth | HAProxy Lua script or http-request with external auth service | Medium |
| Traefik | ForwardAuth middleware | ForwardAuth middleware pointing to Authentik outpost | Low |
| OpenLiteSpeed | External auth (limited) | Reverse proxy to Authentik; manual integration | High |
| Nginx Plus | auth_request + OIDC module | Same as Nginx OSS; Plus adds native OIDC (njs module) | Low |
| LiteSpeed Enterprise | External auth | Apache-compatible mod_auth, or external auth proxy | Medium |
| IIS | OIDC middleware / ARR | OIDC middleware in .NET, or ARR reverse proxy to Authentik | Medium |
Easiest Authentik integration: Nginx (auth_request is well-documented with Authentik), Traefik (ForwardAuth is native), Caddy (forward_auth is simple)
Hardest integration: Lighttpd (no native auth_request), OpenLiteSpeed (manual proxy configuration)
API Comparison
| Tool | API Type | Auth | Webhooks | SDKs |
|---|---|---|---|---|
| Apache | None | N/A | No | None (CLI: apachectl) |
| Nginx | None (stub_status only) | N/A | No | None (CLI: nginx) |
| Caddy | REST (admin API) | Local / mTLS | No | Go (native), cURL |
| Lighttpd | None | N/A | No | None (CLI: lighttpd) |
| HAProxy | REST (Data Plane) + Socket (Runtime) | Basic, Token | No | Python, Go (community) |
| Traefik | REST | Bearer token | No | Go (native), cURL |
| OpenLiteSpeed | None (WebAdmin GUI) | N/A | No | None (CLI: lswsctrl) |
| Nginx Plus | REST (Plus API) | API key | No | Python, Go (official) |
| LiteSpeed Enterprise | None (WebAdmin GUI) | N/A | No | None (CLI: lswsctrl) |
| IIS | REST (Management API) + PowerShell | Windows Auth | No | PowerShell (official), .NET |
Best API: Caddy (full config via REST), HAProxy (runtime + data plane APIs), Nginx Plus (commercial API), Traefik (REST admin API)
No API: Apache, Nginx OSS, Lighttpd, OpenLiteSpeed, LiteSpeed Enterprise
Performance Characteristics
| Tool | Architecture | Concurrency Model | Memory per Connection | Static Throughput | Typical Use |
|---|---|---|---|---|---|
| Apache | Multi-process / event | event MPM: async I/O | ~10 KB (event) | Good | General-purpose, PHP hosting |
| Nginx | Event-driven | Single-threaded workers | ~2.5 KB | Excellent | Reverse proxy, static content |
| Caddy | Goroutine-based | Go scheduler | ~4 KB | Very good | Auto-HTTPS, simple setups |
| Lighttpd | Event-driven | Single-process | ~2 KB | Very good | Embedded, low-resource |
| HAProxy | Event-driven | Multi-threaded (2.x) | ~2 KB | N/A (LB, not content) | Load balancing, TCP/HTTP |
| Traefik | Goroutine-based | Go scheduler | ~4 KB | Good | Container ingress, routing |
| OpenLiteSpeed | Event-driven | Multi-threaded | ~3 KB | Excellent (LSAPI) | PHP hosting, WordPress |
| Nginx Plus | Event-driven | Single-threaded workers | ~2.5 KB | Excellent | Enterprise reverse proxy |
| LiteSpeed Enterprise | Event-driven | Multi-threaded | ~3 KB | Excellent (LSAPI) | PHP hosting, cPanel |
| IIS | Kernel-mode + user-mode | Thread pool (http.sys) | ~8 KB | Good | .NET, Windows apps |
Lowest resource usage: Lighttpd, Nginx, HAProxy (minimal per-connection overhead)
Highest throughput for PHP: LiteSpeed Enterprise and OpenLiteSpeed (LSAPI bypasses PHP-FPM overhead)
Deployment and Licensing
| Tool | License | Language | Packages | Docker | Kubernetes | HA |
|---|---|---|---|---|---|---|
| Apache | Apache-2.0 | C | All distros | Official image | Yes (pods) | Active-passive (heartbeat) |
| Nginx | BSD-2-Clause | C | All distros | Official image | Yes (Ingress Controller) | Active-passive (keepalived) |
| Caddy | Apache-2.0 | Go | Single binary | Official image | Yes (pods) | Active-passive (shared storage) |
| Lighttpd | BSD-3-Clause | C | Most distros | Community image | Yes (pods) | Active-passive |
| HAProxy | GPL-2.0 | C | All distros | Official image | Yes (Ingress Controller) | Active-active (VRRP) |
| Traefik | MIT | Go | Single binary | Official image | Yes (native CRDs) | Redis / Consul cluster |
| OpenLiteSpeed | GPL-3.0 | C++ | CentOS/Ubuntu | Official image | Yes (pods) | ADC cluster |
| Nginx Plus | Proprietary | C | Packages (licensed) | Licensed image | Yes (Ingress Controller) | Active-active (zone sync) |
| LiteSpeed Enterprise | Proprietary | C++ | CentOS/Ubuntu | Licensed image | Yes (pods) | ADC cluster (LiteMage cache) |
| IIS | Proprietary | C++ | Windows Server | Windows containers | Yes (Windows nodes) | NLB + ARR + shared config |
Easiest deployment: Caddy (single binary, zero config HTTPS), Traefik (single binary, auto-discovery)
Most complex: IIS (Windows Server required, Windows containers), LiteSpeed Enterprise (commercial licensing)
Monitoring Integration
| Tool | Telegraf Plugin | Log Format | Fluent Bit Parser | Grafana Dashboard |
|---|---|---|---|---|
| Apache | inputs.apache (server-status) | Combined/Custom | apache2 parser | Apache dashboard (ID: 3786) |
| Nginx | inputs.nginx (stub_status) | Combined/Custom | nginx parser | Nginx dashboard (ID: 12708) |
| Caddy | inputs.prometheus (metrics endpoint) | JSON (structured) | json parser | Custom (Prometheus metrics) |
| Lighttpd | inputs.lighttpd (server.status-url) | CLF/Custom | apache2 parser | Custom |
| HAProxy | inputs.haproxy (stats socket/CSV) | Syslog | syslog parser | HAProxy dashboard (ID: 2428) |
| Traefik | inputs.prometheus (metrics endpoint) | JSON (structured) | json parser | Traefik dashboard (ID: 4475) |
| OpenLiteSpeed | inputs.prometheus (via exporter) | Combined/Custom | apache2 parser | Custom |
| Nginx Plus | inputs.nginx_plus (Plus API) | Combined/Custom | nginx parser | Nginx Plus dashboard (official) |
| LiteSpeed Enterprise | inputs.prometheus (via exporter) | Combined/Custom | apache2 parser | Custom |
| IIS | inputs.win_perf_counters | W3C Extended | regex parser (custom) | IIS dashboard (custom) |
Best monitoring integration: Apache (native Telegraf plugin, standard log format), Nginx (native Telegraf plugin), HAProxy (native Telegraf plugin, CSV stats)
Most effort: IIS (Windows perf counters, custom log parser), OpenLiteSpeed (exporter required)
Kubernetes Ingress Support
| Tool | Ingress Controller | CRD Support | Service Discovery | Cert Management | Community Adoption |
|---|---|---|---|---|---|
| Apache | No official | No | No | Manual | Minimal |
| Nginx | Yes (kubernetes/ingress-nginx) | Yes (Ingress, IngressClass) | Yes (Kubernetes API) | cert-manager | Very high (most used) |
| Caddy | Community (caddy-ingress) | Yes (Ingress) | Yes (Kubernetes API) | Built-in ACME | Low |
| Lighttpd | No | No | No | Manual | None |
| HAProxy | Yes (haproxytech/kubernetes-ingress) | Yes (Ingress, custom CRDs) | Yes (Kubernetes API) | cert-manager | Medium |
| Traefik | Yes (native) | Yes (IngressRoute CRD) | Yes (Kubernetes, Docker, Consul, etc.) | Built-in ACME | Very high (top 3) |
| OpenLiteSpeed | No official | No | No | Manual | Minimal |
| Nginx Plus | Yes (nginxinc/kubernetes-ingress) | Yes (VirtualServer CRD) | Yes (Kubernetes API) | cert-manager | Medium-high |
| LiteSpeed Enterprise | Community | Limited | No | Manual | Minimal |
| IIS | No (Windows nodes only) | No | No | Manual | Minimal |
Top Kubernetes ingress: Nginx Ingress Controller (community), Traefik (native CRDs), HAProxy (haproxytech)
No Kubernetes story: Lighttpd, Apache, OpenLiteSpeed, IIS
Tools
10 tools.
Apache HTTP Server
The Apache HTTP Server (commonly called Apache or httpd) is the world’s most widely deployed web server, maintained by the Apache Software Foundation since 1995.
License: Apache-2.0 (OSS) · Kind: service · Deploy: native · SSO: none
Caddy
Caddy is a modern, open-source web server written in Go that pioneered automatic HTTPS as a default behavior.
License: Apache-2.0 (OSS) · Kind: service · Deploy: native · SSO: none
HAProxy
HAProxy (High Availability Proxy) is the industry- standard open-source load balancer and reverse proxy for TCP and HTTP traffic.
License: GPL-2.0-only (OSS) · Kind: service · Deploy: native · SSO: none
Lighttpd
Lighttpd (pronounced “lighty”) is a lightweight, high-performance web server designed for speed- critical environments with minimal resource consumption.
License: BSD-3-Clause (OSS) · Kind: service · Deploy: native · SSO: none
LiteSpeed Enterprise
LiteSpeed Enterprise (LSWS) is a commercial, high-performance web server designed as a drop-in replacement for Apache HTTP Server.
License: Proprietary (proprietary) · Kind: service · Deploy: native · SSO: none
Microsoft IIS
Internet Information Services (IIS) is Microsoft’s web server platform, integrated into Windows Server as a server role.
License: Proprietary (proprietary) · Kind: service · Deploy: native · SSO: none
Nginx
Nginx (pronounced “engine-x”) is a high- performance, event-driven web server and reverse proxy created by Igor Sysoev in 2004.
License: BSD-2-Clause (OSS) · Kind: service · Deploy: native · SSO: none
Nginx Plus
Nginx Plus is the commercial version of Nginx, developed and sold by F5 Networks. It extends the open-source Nginx core with enterprise features including a live activity monitoring dashboard, active health checks, session persistence, dyna…
License: Proprietary (proprietary) · Kind: service · Deploy: native · SSO: none
OpenLiteSpeed
OpenLiteSpeed (OLS) is the open-source edition of LiteSpeed Technologies’ web server, designed as a high-performance alternative to Apache with drop-in compatibility for Apache configuration directives and .htaccess files.
License: GPL-3.0-only (OSS) · Kind: service · Deploy: native · SSO: none
Traefik
Traefik is a cloud-native reverse proxy and ingress controller designed for dynamic, containerized environments.
License: MIT (OSS) · Kind: service · Deploy: native · SSO: none
