# squid-cache/squid

Squid Web Proxy Cache - Source Code

Repository: https://github.com/squid-cache/squid
Canonical: https://ross.abutalabs.com/products/squid
Homepage: https://www.squid-cache.org/
Language: C++
License: GPL-2.0
License Family: copyleft
Topics: proxy, http, https, ftp, icap, ecap
Last push: 2026-08-26T21:07:34+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4359, "days_push": 7, "days_rel": 9, "gap_med": 0.0, "n_releases_24m": 165}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3071, forks 657 (observed 2026-08-28T04:07:41.629151+00:00)

## What it is
Squid is a mature, full-featured caching web proxy supporting HTTP, HTTPS, and FTP, with extensive access controls, content adaptation via ICAP/eCAP, and logging. It reduces bandwidth and improves response times by caching and reusing frequently-requested web content, and can run as a forward proxy, reverse proxy, or server accelerator.

## Use cases
- cache web traffic to save bandwidth on a corporate or ISP network
- set up a forward proxy with access control and authentication for users
- run a reverse proxy to accelerate and load balance a website
- filter and monitor employee web browsing
- cache Windows or OS updates locally to reduce internet usage
- build cache hierarchies to optimize network throughput
- intercept and inspect HTTPS traffic on a network

## When to choose
- you need a battle-tested, high-performance caching proxy with rich ACLs
- you want to reduce bandwidth costs or speed up content delivery for many clients
- you need content adaptation, interception caching, or proxy authentication
- you want a self-hosted proxy that runs on nearly any OS

## When to avoid
- you need a modern programmable edge proxy or API gateway (consider Envoy, NGINX, or HAProxy)
- you only need simple TLS termination or load balancing without caching
- you need HTTP/2 or HTTP/3 proxying, which Squid's HTTP/1.x proxy core does not fully support

## Facets
- artifact type: application
- maturity: stable
- function: proxy, caching, http-server, middleware, logging, auth, authorization, rate-limiting
- domain: networking, web-development, security, performance, self-hosted
- platform: windows, bsd, cross-platform, self-hosted
- tags: web-proxy, forward-proxy, reverse-proxy, http-cache, content-filtering, bandwidth-optimization, icap, ecap, ssl-bump, access-control, linux, macos, web-server

## Member repositories
- squid-cache/squid (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:41.629151+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:28:01.715364+00:00, confidence not recorded.
  - readme: https://github.com/squid-cache/squid (fetched 2026-08-28T04:07:41.629151+00:00, sha c900eb6a7922)
  - homepage: https://www.squid-cache.org/ (fetched 2026-08-29T09:43:25.271915+00:00, sha c578e61028cd)
  - site_page: https://www.squid-cache.org/Doc (fetched 2026-08-29T09:43:25.274452+00:00, sha 9e2d781c068e)
  - site_page: https://www.squid-cache.org/Intro (fetched 2026-08-29T09:43:25.276024+00:00, sha 18817e559866)
  - site_page: https://wiki.squid-cache.org/SquidFaq (fetched 2026-08-29T09:43:25.277693+00:00, sha 917cb0ba23e3)
- Data as of 2026-08-30T08:39:29.467469+00:00.