7 Best Open-Source Proxy Servers in 2026

Quick Answer

Squid is the strongest general-purpose choice for a self-hosted HTTP and HTTPS forward proxy with caching, access controls, authentication, and detailed logging. 3proxy is a better fit when a small deployment needs HTTP, HTTPS CONNECT, SOCKS4, SOCKS5, DNS, port mapping, and proxy chaining in one compact package. Dante is the specialist choice for a dedicated SOCKS4 or SOCKS5 server.

NGINX, HAProxy, and Caddy primarily solve the opposite traffic problem: they receive requests on behalf of applications and route them to backends. NGINX is the broadest general-purpose reverse proxy, HAProxy is built around high-availability TCP and HTTP load balancing, and Caddy offers the easiest path to a reverse proxy with automatic HTTPS. Envoy is the most capable option for cloud-native edge, service-mesh, and programmable egress deployments, including an advanced dynamic HTTP forward-proxy mode.

Choose by traffic direction before comparing features. If applications need outbound access through another server, start with the forward-proxy options. If users need inbound access to websites or APIs, compare reverse proxies. Open-source proxy software gives you control over a server, but it does not create a residential or mobile IP pool, geographic targeting, or automatic IP rotation.

Key Takeaways

• “Proxy server” is not one product category. Forward proxies represent clients, reverse proxies represent servers, and service proxies manage traffic between applications. A tool can support more than one role, but its strongest operating model still matters.
• Squid, 3proxy, and Dante are the clearest outbound-proxy choices. Squid is strongest for web-aware policy and caching, 3proxy for a compact multi-protocol gateway, and Dante for SOCKS-focused deployments.
• NGINX, HAProxy, and Caddy should primarily be evaluated as reverse proxies. They are designed to publish, protect, route, and load-balance known services rather than provide arbitrary public-web egress for client applications.
• Envoy covers the widest architectural range but has the highest configuration burden. It can operate at the edge, beside services, or as a dynamic HTTP forward proxy, with strong observability and policy extensions.
• Open-source software does not provide an IP network. A self-hosted proxy normally exits through the public IPs attached to the machines you provision. Rotation and geographic diversity require additional servers, addresses, routing, and orchestration.
• There is no documented universal performance winner. Throughput, latency, connection count, cacheability, TLS behavior, configuration, hardware, network path, and workload all affect results. Test shortlisted tools under one representative workload.

Methodology: Roles, protocol support, licensing, current public releases, and documented capabilities were checked against first-party project sources on August 21, 2026. “Best” means the strongest documented fit for the stated use case; it is not a measured speed or reliability ranking. We did not run a shared throughput, latency, cache, or failover benchmark. The software listed here can be used without a license subscription, but infrastructure, operations, paid support, enterprise editions, and optional modules can add cost. Proxidize is not ranked because it provides managed residential and mobile proxy infrastructure rather than open-source proxy-server software.

Quick Comparison: Best Open-Source Proxy Servers

The table is not a single leaderboard. Squid and Caddy can both be excellent proxy servers while solving requests that travel in opposite directions. A technically impressive tool is still the wrong choice when its traffic model does not match the deployment.

Forward Proxy vs. Reverse Proxy vs. Service Proxy

A forward proxy is selected by a client or enforced as the client's egress path. It connects outward to destinations on the client's behalf:

The destination normally sees the forward proxy server's public egress IP. Squid, 3proxy, and Dante are the most direct fits in this comparison. Envoy can also provide dynamic forward proxying, although its configuration model is designed for larger platform and service-networking environments.

A reverse proxy receives traffic addressed to an application, then selects a known backend:

NGINX, HAProxy, and Caddy are strongest in this role. They can terminate TLS, route by hostname or path, balance requests, run health checks, and keep backend addresses private. A reverse proxy does not normally give a browser or scraper a new outbound identity when it visits an unrelated website.

A service proxy manages traffic between workloads or at an application edge. Envoy is the clearest example. It can run as a sidecar, gateway, ingress proxy, egress proxy, or edge proxy, and its role depends on the listener, cluster, filter, and control-plane configuration.

The categories can overlap. Squid supports accelerator configurations, Envoy supports both forward and reverse paths, and NGINX mainline gained native HTTP CONNECT tunneling in 2026. That overlap does not make the products interchangeable. For a deeper protocol-level distinction, see HTTP vs. SOCKS5 proxies.

Detailed Reviews of the Best Open-Source Proxy Servers

1. Squid: Best Overall Open-Source Web Forward Proxy

Squid is a web-aware caching proxy for HTTP, HTTPS, FTP, and related traffic. It combines a forward proxy, configurable cache, authentication helpers, request logging, access-control lists, traffic-routing rules, and parent-cache support. The project describes Squid as an event-driven proxy that handles requests in a single non-blocking I/O process, making it a mature choice for shared organizational egress.

For HTTPS destinations, a client normally asks Squid to create a tunnel with the HTTP CONNECT method. Squid can authorize the destination and port before relaying the encrypted session. Its separate TLS-inspection features should only be used in an authorized environment with appropriate certificates, notice, privacy controls, and legal review; ordinary CONNECT tunneling does not require decrypting the destination payload.

Squid is the best fit when administrators need web-specific controls, reusable object caching, detailed logs, authentication, allowlists, denylists, or a hierarchy of parent proxies. It is less suitable when the primary requirement is generic SOCKS5, UDP relay, or a minimal configuration for one small application. Caching also provides little benefit for personalized, frequently changing, or explicitly non-cacheable responses.

The current supported release series is Squid 7.6, and the project distributes Squid under GPLv2. The project only supports its latest stable series directly, so operating-system packages should be checked for version and security-maintenance status rather than installed and forgotten.

2. 3proxy: Best Lightweight Multi-Protocol Proxy Server

3proxy packages a wide range of small proxy services into one project. Its documented features include an HTTP/1.1 forward proxy, HTTPS CONNECT, SOCKS4 and SOCKS5, SOCKS5 UDP and BIND, DNS proxying, TCP and UDP port mapping, SNI routing, authentication, ACLs, bandwidth and traffic limits, and parent-proxy chaining. Official Windows binaries, Linux packages, and container images make it practical for labs, branch offices, development environments, and small gateways.

The breadth is its main advantage. One 3proxy deployment can accept one proxy protocol and send traffic through a different parent type, choose among parent proxies, or bind services to different interfaces. That is useful when older applications, browsers, command-line tools, and custom clients need different connection methods.

The tradeoff is operational maturity at very high scale. The project's own high-load guidance says 3proxy was not originally designed for high load and uses a one-connection-per-thread model, even though tuned deployments can handle substantial connection counts. Its security guidance also emphasizes private configuration files, unprivileged accounts, explicit interfaces, and restrictive ACLs. Never expose the default listener as an unauthenticated public proxy.

Version 0.9.8 was released in August 2026 with several security fixes, so older packages deserve particular scrutiny. The project uses its own permissive BSD-style license agreement and also permits distribution under listed compatible licenses.

3. Dante: Best Open-Source SOCKS5 Proxy Server

Dante is a purpose-built SOCKS client and server implementation. The server supports SOCKS4 and SOCKS5, IPv4 and IPv6, TCP connections, SOCKS5 UDP relay, username/password authentication, GSS-API authentication, detailed rules, logging, resource controls, and server chaining. Its client library and socksify utility can also redirect compatible applications that do not provide native SOCKS settings.

Dante is the cleanest choice when the requirement is specifically a standards-based SOCKS gateway rather than an HTTP-aware cache. SOCKS5 can relay application protocols without parsing their contents and can perform destination DNS resolution when the client sends a hostname. This makes Dante useful for mixed TCP applications and supported UDP workflows.

That focus is also the limitation. Dante is not an HTTP cache, header-processing gateway, or modern application reverse proxy. Its open distribution includes the core SOCKS server, while optional commercial modules add capabilities such as LDAP authorization, bandwidth management, and redirection. Teams should therefore verify whether the free core covers their identity and policy requirements.

The latest public version is Dante 1.4.4. Source code is available under a BSD/CMU-style license. The project is primarily associated with Unix-like systems, so teams needing simple native Windows deployment may find 3proxy easier.

4. NGINX: Best General-Purpose Open-Source Reverse Proxy

NGINX is an HTTP web server, reverse proxy, content cache, load balancer, TCP/UDP proxy, and mail proxy distributed under the 2-clause BSD license. It is a strong default for publishing websites and APIs, terminating TLS, routing by host or path, caching suitable responses, serving static assets, and distributing requests across application backends.

There is an important 2026 update. NGINX 1.31.0 introduced the ngx_http_tunnel_module, which handles HTTP/1.1 CONNECT requests and establishes end-to-end tunnels. That means current mainline NGINX can perform a narrow but useful forward-proxy function without the older third-party CONNECT module. Check the exact branch and build: the feature arrived in the 1.31 mainline series, and NGINX is still not a SOCKS server or a feature-for-feature replacement for Squid's web-egress policy and cache model.

Choose NGINX when the main job is inbound web delivery and the team values its broad ecosystem, familiar configuration, TLS features, caching, and HTTP/TCP/UDP routing. Use a dedicated forward-proxy product when arbitrary outbound destinations, SOCKS, user-oriented egress controls, or parent-proxy behavior are the center of the design.

The current mainline release checked for this guide is NGINX 1.31.4. NGINX Open Source remains active; it should not be confused with the separate Kubernetes community ingress-nginx controller discussed below.

5. HAProxy: Best for High-Availability TCP and HTTP Load Balancing

HAProxy describes itself as a fast, reliable reverse proxy for TCP and HTTP applications. Its design centers on frontends, backends, server pools, health checks, routing rules, load-balancing algorithms, failover, connection management, and detailed runtime statistics. This makes it a strong choice for databases, APIs, web applications, and other services where availability and precise traffic distribution matter more than serving files or managing certificates automatically.

HAProxy operates at both Layer 4 and Layer 7. Administrators can route raw TCP connections or apply HTTP-aware rules, terminate TLS, check backend health, retry eligible failures, drain servers, and update runtime state. The 3.4 LTS series added dynamic backends that can be created and managed through the CLI, strengthening its fit for orchestrated environments.

HAProxy is not a general forward proxy for client-selected public destinations. It sends traffic to backends defined or discovered by the operator. That is exactly what makes its behavior predictable for application delivery, but it means Squid, 3proxy, Dante, or Envoy's dynamic forward proxy is a better match for outbound egress.

The current LTS patch checked here is HAProxy 3.4.3. HAProxy is licensed under GPLv2 or later, with library headers under LGPL 2.1.

6. Caddy: Best for Simple Reverse Proxying With Automatic HTTPS

Caddy is a modular web server whose standard distribution includes automatic HTTPS and a production-ready HTTP(S) reverse proxy. A minimal Caddyfile can publish an application behind TLS with very little configuration, while the full reverse_proxy directive supports multiple upstreams, load-balancing policies, retries, request and response header changes, active and passive health checks, streaming, and HTTPS backends.

Caddy is the most approachable option in this list for a small team that wants to put a service behind a domain name without separately scripting certificate issuance and renewal. Its native configuration API and module system also leave room for more advanced deployments.

The standard documented Caddy build is a web server and reverse proxy, not an arbitrary-destination HTTP or SOCKS forward proxy. Third-party modules can extend Caddy, but adding a plugin changes the build, supply chain, maintenance responsibility, and support surface. This comparison evaluates Caddy's official standard feature set rather than independently maintained forward-proxy plugins.

The current release checked is Caddy 2.11.4, licensed under Apache 2.0. Choose it for simple application publishing and automatic certificate management; choose HAProxy, NGINX, or Envoy when the traffic policy or platform integration is the larger requirement.

7. Envoy: Best for Cloud-Native Edge, Service, and Egress Proxying

Envoy is an open-source edge and service proxy designed for distributed systems. It supports Layer 3/4 filters, HTTP routing, TCP and UDP proxying, TLS, retries, circuit breaking, outlier detection, active health checks, multiple load-balancing policies, statistics, tracing, and dynamic configuration through the xDS APIs. It can run beside applications, at a network edge, or behind a control plane as the data layer for a service mesh or gateway.

Unlike most reverse-proxy-focused tools, Envoy has an official dynamic HTTP forward proxy. It can resolve previously unknown destination hosts asynchronously, cache DNS information, and combine forward proxying with authentication, RBAC, rate limiting, and other filters. Envoy also documents an upstream HTTP/1.1 CONNECT transport for reaching endpoints through another proxy. Envoy marks that transport as functional but without substantial production burn time and with an unknown security posture, so it should only be considered where both sides are trusted and the limitation is acceptable.

That flexibility comes with complexity. Listeners, filters, routes, clusters, endpoints, transport sockets, and control-plane updates form a larger configuration model than a Squid ACL or Caddyfile. Envoy's documentation also warns that a dynamic forward proxy exposed to untrusted clients or destinations can become a confused deputy capable of reaching localhost, cloud metadata, link-local, or private-network addresses. Default-deny RBAC, network firewalls, destination restrictions, and a protected admin endpoint are essential.

The current supported release checked is Envoy 1.39.0, and the project uses Apache 2.0. Choose Envoy when service discovery, dynamic configuration, observability, and one consistent data plane justify the operating complexity.

What the Ingress-NGINX Retirement Means in 2026

The Kubernetes community retired ingress-nginx in March 2026, and its repository was archived on March 24. Existing deployments continue to run, but the project no longer publishes bug fixes, security patches, or other updates. Organizations still using that controller should plan a migration to a maintained ingress controller or a Gateway API implementation.

This does not mean NGINX Open Source was retired. These are separate projects:

• NGINX Open Source is the actively maintained server and proxy reviewed in this article.
• ingress-nginx was the Kubernetes community controller that generated NGINX configuration and is now retired.
• F5 NGINX Ingress Controller and NGINX Gateway Fabric are separate projects with their own maintainers and lifecycles.

NGINX, HAProxy, Caddy, and Envoy are therefore still valid proxy technologies in 2026. However, installing one proxy binary is not automatically a drop-in replacement for ingress-nginx. Kubernetes API support, status handling, certificates, policy, observability, high availability, and migration behavior must be evaluated at the controller or Gateway implementation level.

How to Choose an Open-Source Proxy Server

Start with the connection model, then compare the narrower requirements.

After selecting the right category, test the actual workload. Measure successful connection rate, median and p95 latency, throughput, CPU and memory use, maximum sustained concurrency, failover time, log quality, policy-revocation time, cache hit rate where relevant, and the operational effort required to patch and recover the service. A benchmark from a different protocol, hardware profile, or traffic pattern may not predict your deployment.

Security Checklist for a Self-Hosted Proxy

A proxy is an access path, so a permissive default can turn a useful internal service into an abused public relay. At minimum:

• Bind listeners to private interfaces or trusted networks unless public exposure is an explicit design requirement.
• Require authentication and protect the client-to-proxy connection when credentials or sensitive metadata cross an untrusted network.
• Use default-deny source, destination, protocol, method, and port policies; allow only what the workload requires.
• Block access to localhost, link-local addresses, cloud metadata endpoints, management networks, and other unintended private destinations.
• Run the process with minimal privileges, protect configuration and log files, and isolate the service with operating-system or container controls.
• Apply security updates promptly, subscribe to project advisories, validate configuration before reload, and keep a tested rollback path.
• Set connection, request, bandwidth, buffer, DNS-cache, and file-descriptor limits appropriate to the server and workload.
• Monitor authentication failures, destination anomalies, bandwidth spikes, open-relay tests, resource exhaustion, and unexpected configuration changes.

TLS inspection adds a separate category of risk. Only decrypt traffic in an authorized environment with informed organizational approval, properly managed trust certificates, restricted data access, retention controls, and applicable legal review. A normal HTTPS tunnel through a forward proxy does not require decrypting the application payload.

Self-Hosted Proxy Server vs. Managed Proxy Network

Self-hosted proxy software and a managed proxy network are different layers, not direct substitutes.

A self-hosted proxy can change the public IP seen by a destination—but only to an address available on that proxy host or its configured upstream route. Deploying Squid on one cloud VM normally gives you one datacenter egress location, not a rotating residential network. Installing Dante on a server does not turn the server's IP into a mobile carrier IP. The software controls forwarding; the underlying connection determines the IP type and location.

Self-hosting is strongest when the organization needs control over internal egress policy, caching, application delivery, service-to-service traffic, or a fixed set of owned exits. A managed network is stronger when the workload needs many public IPs, broader geographic coverage, provider-managed rotation, or residential and mobile network identity.

Where Proxidize Fits

Proxidize provides the managed network layer. Its residential product offers ethically sourced IPs across 195+ countries, country, city, and ISP targeting, rotating and sticky sessions, HTTP, HTTPS, and SOCKS5 support, unlimited concurrent connections, dashboard and API visibility, and pricing from $1 per GB. Proxidize also provides managed mobile proxies for workflows that specifically require real mobile carrier egress.

Applications can connect directly to a Proxidize access point using standard proxy credentials. A team can also keep a compatible self-hosted forward proxy as a local policy gateway and send approved traffic to a managed parent or upstream endpoint:

This design can separate internal authentication, allowlists, audit policy, and caching from public exit selection. It also adds another failure domain, so teams should verify CONNECT behavior, upstream authentication, DNS resolution, timeout propagation, retry policy, session persistence, and logging before production use. If the local gateway adds no required policy, connecting the application directly to Proxidize is simpler.

Use a self-hosted server when you want to operate the server and its fixed egress yourself. Use Proxidize when you need a managed residential or mobile proxy network with location and session controls. Use both when local egress governance and managed public exits are separate requirements.

Choose the Proxy Role Before the Proxy Brand

Squid is the strongest overall option for a web-focused forward proxy. 3proxy is the most flexible compact gateway, while Dante is the clearest SOCKS specialist. For inbound traffic, NGINX is the broad general-purpose reverse proxy, HAProxy is strongest for health-aware TCP and HTTP load balancing, and Caddy is the easiest route to automatic HTTPS. Envoy is the advanced choice when one programmable proxy must operate across cloud-native edge, service, and egress paths.

None of these products automatically supplies a diverse public IP network. If a fixed self-hosted exit meets the requirement, open-source software provides maximum control. If the workload needs managed residential or mobile IPs, geographic selection, rotation, or sticky sessions, explore Proxidize proxy options instead of building an IP-supply network around the server software.