$ show caddyserver/caddy

[account ↗] [repo ↗] APPLICATION ★ 76236 5023 ● active (last update 2 weeks ago)

── AI DEEP ANALYSIS ──

reviewed by: deepseek/deepseek-v4-flash

Caddy is a production-grade, extensible web server platform written in Go. It automatically manages HTTPS certificates (via ACME/ZeroSSL) and provides a rich set of HTTP middleware including reverse proxy, file serving, authentication, compression, and headers manipulation. The architecture is modular: all features are registered as Caddy modules following a consistent lifecycle (Provision/Validate/Cleanup) and configured via a JSON config or the Caddyfile adapter. Key entry points are the CLI (caddy run, caddy start, etc.) and the admin API for runtime config changes. Primary data flows involve incoming HTTP requests being processed by a middleware chain of matchers and handlers, with TLS termination handled by the TLS app. External dependencies include certmagic for certificate management, zap for structured logging, Prometheus for metrics, and OpenTelemetry for tracing. The codebase is actively maintained with extensive test coverage and fuzz testing.

── METRICS ──

RATING9.9/10

QUALITY9.0/10

MAINTENANCEactive

DRIFTlow

CONTRIBUTORS423

VELOCITY0.97

OPEN ISSUES296

CLOSED ISSUES4398

LAST COMMIT2 weeks ago

── TAGS ──

#web-server #reverse-proxy #tls-automation #go #middleware #http #caddyfile #http-server #https #tls #automatic-https #privacy #security #acme #caddy #golang #http3

── GITHUB TOPICS ──

go web-server caddyfile http http-server reverse-proxy https tls automatic-https privacy security acme caddy golang http3

── DEPENDENCY GRAPH ──

github.com/BurntSushi/toml (go) v1.6.0

github.com/DeRuina/timberjack (go) v1.4.5

github.com/KimMachineGun/automemlimit (go) v0.7.5

github.com/Masterminds/sprig/v3 (go) v3.3.0

github.com/alecthomas/chroma/v2 (go) v2.27.0

github.com/aryann/difflib (go) v0.0.0-20210328193216-ff5ff6dc229b

github.com/caddyserver/certmagic (go) v0.25.4

github.com/caddyserver/zerossl (go) v0.1.5

github.com/cloudflare/circl (go) v1.6.4

github.com/dunglas/go-urlpattern (go) v0.0.0-20260421141449-cbab7cf1e16d

github.com/dustin/go-humanize (go) v1.0.1

github.com/go-chi/chi/v5 (go) v5.3.1

github.com/google/cel-go (go) v0.29.2

github.com/google/uuid (go) v1.6.0

github.com/klauspost/compress (go) v1.19.0

github.com/klauspost/cpuid/v2 (go) v2.4.0

github.com/mholt/acmez/v3 (go) v3.1.6

github.com/prometheus/client_golang (go) v1.23.2

github.com/quic-go/quic-go (go) v0.60.0

github.com/smallstep/certificates (go) v0.30.2

github.com/smallstep/nosql (go) v0.8.0

github.com/smallstep/truststore (go) v0.13.0

github.com/spf13/cobra (go) v1.10.2

github.com/spf13/pflag (go) v1.0.10

github.com/stretchr/testify (go) v1.11.1

github.com/tailscale/tscert (go) v0.0.0-20251216020129-aea342f6d747

github.com/yuin/goldmark (go) v1.8.2

github.com/yuin/goldmark-highlighting/v2 (go) v2.0.0-20230729083705-37449abec8cc

go.opentelemetry.io/contrib/bridges/prometheus (go) v0.69.0

go.opentelemetry.io/contrib/exporters/autoexport (go) v0.69.0

go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp (go) v0.69.0

go.opentelemetry.io/contrib/propagators/autoprop (go) v0.69.0

go.opentelemetry.io/otel (go) v1.44.0

go.opentelemetry.io/otel/sdk (go) v1.44.0

go.opentelemetry.io/otel/sdk/metric (go) v1.44.0

go.step.sm/crypto (go) v0.81.1

go.uber.org/automaxprocs (go) v1.6.0

go.uber.org/zap (go) v1.28.0

go.uber.org/zap/exp (go) v0.3.0

golang.org/x/crypto (go) v0.54.0

golang.org/x/crypto/x509roots/fallback (go) v0.0.0-20260709184058-243e02a382f8

golang.org/x/net (go) v0.57.0

golang.org/x/sync (go) v0.22.0

golang.org/x/term (go) v0.45.0

golang.org/x/time (go) v0.15.0

gopkg.in/yaml.v3 (go) v3.0.1

cel.dev/expr (go) v0.25.1

cloud.google.com/go/auth (go) v0.20.0

cloud.google.com/go/auth/oauth2adapt (go) v0.2.8

cloud.google.com/go/compute/metadata (go) v0.9.0

dario.cat/mergo (go) v1.0.2

filippo.io/bigmod (go) v0.1.0

github.com/antlr4-go/antlr/v4 (go) v4.13.1

github.com/bits-and-blooms/bitset (go) v1.24.4

github.com/ccoveille/go-safecast/v2 (go) v2.0.0

github.com/cenkalti/backoff/v5 (go) v5.0.3

github.com/coreos/go-oidc/v3 (go) v3.17.0

github.com/davecgh/go-spew (go) v1.1.1

github.com/dlclark/regexp2/v2 (go) v2.2.1

github.com/fxamacker/cbor/v2 (go) v2.9.0

github.com/go-jose/go-jose/v3 (go) v3.0.5

github.com/go-jose/go-jose/v4 (go) v4.1.4

github.com/google/certificate-transparency-go (go) v1.1.8-0.20240110162603-74a5dd331745

github.com/google/go-tpm (go) v0.9.8

github.com/google/go-tspi (go) v0.3.0

github.com/google/s2a-go (go) v0.1.9

github.com/googleapis/enterprise-certificate-proxy (go) v0.3.15

github.com/googleapis/gax-go/v2 (go) v2.22.0

github.com/grpc-ecosystem/grpc-gateway/v2 (go) v2.29.0

github.com/jackc/pgx/v5 (go) v5.9.2

github.com/jackc/puddle/v2 (go) v2.2.2

github.com/kylelemons/godebug (go) v1.1.0

github.com/munnerz/goautoneg (go) v0.0.0-20191010083416-a7dc8b61c822

github.com/nlnwa/whatwg-url (go) v0.6.2

github.com/pbnjay/memory (go) v0.0.0-20210728143218-7b4eea64cf58

github.com/pmezard/go-difflib (go) v1.0.0

github.com/prometheus/otlptranslator (go) v1.0.0

github.com/quic-go/qpack (go) v0.6.0

github.com/smallstep/cli-utils (go) v0.12.2

github.com/smallstep/go-attestation (go) v0.4.4-0.20260603212853-e1a87a0b07d9

github.com/smallstep/linkedca (go) v0.25.0

github.com/smallstep/pkcs7 (go) v0.2.1

github.com/smallstep/scep (go) v0.0.0-20250318231241-a25cabb69492

github.com/tailscale/go-winio (go) v0.0.0-20231025203758-c4f33415bf55

github.com/x448/float16 (go) v0.8.4

github.com/zeebo/blake3 (go) v0.2.4

go.opentelemetry.io/auto/sdk (go) v1.2.1

go.opentelemetry.io/contrib/propagators/aws (go) v1.44.0

go.opentelemetry.io/contrib/propagators/b3 (go) v1.44.0

go.opentelemetry.io/contrib/propagators/jaeger (go) v1.44.0

go.opentelemetry.io/contrib/propagators/ot (go) v1.44.0

go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc (go) v0.20.0

go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp (go) v0.20.0

go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc (go) v1.44.0

go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp (go) v1.44.0

go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc (go) v1.44.0

go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp (go) v1.44.0

go.opentelemetry.io/otel/exporters/prometheus (go) v0.66.0

go.opentelemetry.io/otel/exporters/stdout/stdoutlog (go) v0.20.0

go.opentelemetry.io/otel/exporters/stdout/stdoutmetric (go) v1.44.0

── FILE BREAKDOWN ──

Files by Type (count)

394

Other (.caddyfiletest)

258

Text

YAML

Markdown

Other (no ext)

HTML

PHP

Other (.crt)

Other (.key)

Config

Git Ignore

Files by Type (size)

3MB

Other (.caddyfiletest)

324KB

JSON

286KB

JavaScript

154KB

HTML

131KB

YAML

72KB

Other (.sum)

53KB

CSS

52KB

Markdown

47KB

Other (no ext)

11KB

Text

9KB

Other (.mod)

8KB

── KEY FINDINGS: REUSABLE CODE ──

The LLM identified 4 files worth highlighting for reuse:

A generic, thread-safe reference-counted pool for shared resources. Supports LoadOrNew with constructor and destructor functions. Used for listeners, upstream hosts, and log writers. Demonstrates careful resource management and can be extracted for any Go project needing shared resource lifecycle.

file: usagepool.go ↗ | tags: #resource-pool #reference-counting #generic

Defines a Selector interface for load balancing with implementations: random, round-robin, IP hash, cookie, header, URI hash, first, and least connections. Each policy is a separate module with configurable parameters. Demonstrates clean interface design and can be reused as a standalone load-balancing library.

file: modules/caddyhttp/reverseproxy/selectionpolicies.go ↗ | tags: #load-balancing #selector-pattern #interface

Provides a chainable set of log field filters: delete, replace, hash, IP anonymization, regexp, cookie, and query string manipulation. Each filter implements a common interface and can be composed. The filters are validated during provisioning and applied during log writing. This pattern is reusable for any structured logging pipeline.

file: modules/logging/filters.go ↗ | tags: #logging #filter-pattern #field-transformation

A robust tokenizer for the Caddyfile configuration language, supporting heredoc syntax, environment variable expansion, and import directives. It is fuzz-tested and handles edge cases like whitespace, quotes, and blocks. The lexer is self-contained and could be reused for parsing other domain-specific languages.

file: caddyconfig/caddyfile/lexer.go ↗ | tags: #lexer #tokenizer #heredoc #fuzzing

── HISTORY ──

Last analyzed: 2026-08-14 14:00:58.968019

Next check: 2026-10-02 23:05:57.568167