diff --git a/README.md b/README.md
index 011858d..1d81342 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,7 @@ Options are saved between runs into `package.json`. To invert a boolean options,
 * `--alpine` - use [alpine](https://www.alpinelinux.org/) as base image
 * `--build=CMD` - command to be used to build your application.
 * `--cache` - use build caching to speed up builds
+* `--caddy` - serve static sites (Vite, static Astro) with [Caddy](https://caddyserver.com/) instead of nginx.
 * `--cmd=CMD` - CMD to use in Dockerfile
 * `--defer-build` - may be needed when your build step requires access to secrets that are not available at image build time. Results in larger images and slower deployments.
 * `--dev` - include `devDependencies` in the production image.
diff --git a/gdf.js b/gdf.js
index a97255e..8005ded 100755
--- a/gdf.js
+++ b/gdf.js
@@ -15,6 +15,7 @@ export const defaults = {
   bun: false,
   build: '',
   cache: false,
+  caddy: false,
   cmd: '',
   deferBuild: false,
   dev: false,
@@ -130,16 +131,67 @@ export class GDF {
   }
 
   get astro() {
-    return !!(this.#pj.dependencies?.astro)
+    return !!(this.#pj.dependencies?.astro || this.#pj.devDependencies?.astro)
+  }
+
+  // contents of astro.config.*, or an empty string
+  get astroConfig() {
+    if (!this.astro) return ''
+
+    for (const ext of ['mjs', 'js', 'ts', 'mts', 'cjs', 'cts']) {
+      const file = path.join(this._appdir, `astro.config.${ext}`)
+      if (fs.existsSync(file)) return fs.readFileSync(file, 'utf-8')
+    }
+
+    return ''
+  }
+
+  // value of a top level string option in astro.config.*, eg. outDir or base
+  astroOption(name) {
+    const match = this.astroConfig.match(new RegExp(`\\b${name}\\s*:\\s*(["'\`])(.+?)\\1`))
+    return match?.[2]
+  }
+
+  get astroAdapter() {
+    return !!(this.#pj.dependencies?.['@astrojs/node'] || this.#pj.devDependencies?.['@astrojs/node'])
+  }
+
+  // middleware mode builds a handler for a custom server, which the start script runs
+  get astroMiddleware() {
+    return this.astroAdapter && /mode\s*:\s*(["'`])middleware\1/.test(this.astroConfig)
   }
 
   get astroSSR() {
-    return !!(this.#pj.dependencies?.astro) &&
-      !!(this.#pj.dependencies?.['@astrojs/node'])
+    return this.astro && this.astroAdapter && !this.astroMiddleware
+  }
+
+  // the server imports astro, the adapter and their dependencies at runtime
+  get astroSSRDevDependencies() {
+    return this.astroSSR &&
+      !!(this.#pj.devDependencies?.astro || this.#pj.devDependencies?.['@astrojs/node'])
   }
 
   get astroStatic() {
-    return this.astro && !this.astroSSR
+    return this.astro && !this.astroAdapter
+  }
+
+  get astroOutDir() {
+    const outDir = this.astroOption('outDir')
+    if (!outDir) return 'dist'
+    return path.posix.normalize(outDir).replace(/\/$/, '')
+  }
+
+  // path prefix the site is served from, eg. /docs; empty for the root
+  get astroBase() {
+    if (!this.astroStatic) return ''
+    const base = this.astroOption('base')
+    if (!base) return ''
+    return path.posix.join('/', base).replace(/\/$/, '')
+  }
+
+  // directory containing the built static site
+  get staticDir() {
+    return this.astroStatic ? this.astroOutDir : 'dist'
   }
 
   get svelte() {
@@ -986,10 +1038,12 @@ export class GDF {
       return ['node', 'main.js']
     } else if (this.gatsby) {
       return [this.npx, 'gatsby', 'serve', '-H', '0.0.0.0']
+    } else if ((this.vite || this.astroStatic) && this.options.caddy) {
+      return ['caddy', 'run', '--config', '/etc/caddy/Caddyfile', '--adapter', 'caddyfile']
     } else if (this.vite || this.astroStatic) {
       return ['/usr/sbin/nginx', '-g', 'daemon off;']
     } else if (this.astroSSR) {
-      return ['node', './dist/server/entry.mjs']
+      return ['node', `./${this.astroOutDir}/server/entry.mjs`]
     } else if (this.runtime === 'Node.js' && this.#pj.scripts?.start?.includes('fastify')) {
       let start = this.#pj.scripts.start
       if (!start.includes('-a') && !start.includes('--address')) {
diff --git a/index.js b/index.js
index ea089e4..a973751 100755
--- a/index.js
+++ b/index.js
@@ -40,6 +40,10 @@ const options = yargs((hideBin(process.argv)))
     describe: 'use build caching to speed up builds',
     type: 'string'
   })
+  .option('caddy', {
+    describe: 'serve static sites with caddy instead of nginx',
+    type: 'boolean'
+  })
   .option('defer-build', {
     describe: 'if true, run build at deploy time',
     type: 'boolean'
diff --git a/templates/Dockerfile.ejs b/templates/Dockerfile.ejs
index 55f2396..9c3f3dc 100644
--- a/templates/Dockerfile.ejs
+++ b/templates/Dockerfile.ejs
@@ -120,7 +120,7 @@ RUN cd bundle/bundle/programs/server && meteor npm install
 # Build application
 RUN <%- mountSecrets %><%= build %>
 
-<% if (devDependencies && !options.dev && !nestjs && !adonisjs && !prismaSeed && !nuxtjs) { -%>
+<% if (devDependencies && !options.dev && !nestjs && !adonisjs && !prismaSeed && !nuxtjs && !astroStatic && !astroSSRDevDependencies) { -%>
 # Remove development dependencies
 RUN <%- buildCache %><%- packagerPrune %>
 
@@ -142,6 +142,8 @@ WORKDIR /app
 
 # Set production environment
 <%- emitEnv(baseEnv) %>
+<% } else if ((vite || astroStatic) && options.caddy) { -%>
+FROM caddy:2-alpine
 <% } else if (vite || astroStatic) { -%>
 FROM nginx
 <% } else { -%>
@@ -170,11 +172,13 @@ RUN wget https://github.com/benbjohnson/litestream/releases/download/v0.3.13/lit
 
 <% } -%>
 # Copy built application
-<% if (vite || astroStatic) { -%>
-COPY --from=build /app/dist /usr/share/nginx/html
+<% if ((vite || astroStatic) && options.caddy) { -%>
+COPY --from=build /app/<%= staticDir %> /srv<%= astroBase %>
+<% } else if (vite || astroStatic) { -%>
+COPY --from=build /app/<%= staticDir %> /usr/share/nginx/html<%= astroBase %>
 <% } else if (astroSSR) { -%>
 COPY --from=build /app/node_modules /app/node_modules
-COPY --from=build /app/dist /app/dist
+COPY --from=build /app/<%= astroOutDir %> /app/<%= astroOutDir %>
 
 ENV PORT=4321
 ENV HOST=0.0.0.0
@@ -240,6 +244,41 @@ ENTRYPOINT <%- entrypoint %>
 # Deploy arguments 
 <%- emitArgs(options.args.deploy) %>
             
+<% } -%>
+<% if (astroStatic && options.caddy) { -%>
+# Serve the site, with its own 404 page
+COPY <<-"EOF" /etc/caddy/Caddyfile
+:<%= port %> {
+  root * /srv
+  file_server
+  handle_errors 404 {
+    rewrite * <%= astroBase %>/404.html
+    file_server
+  }
+}
+EOF
+
+<% } else if (vite && options.caddy) { -%>
+# Serve the site
+COPY <<-"EOF" /etc/caddy/Caddyfile
+:<%= port %> {
+  root * /srv
+  file_server
+}
+EOF
+
+<% } else if (astroStatic) { -%>
+# Serve the site, with its own 404 page and relative redirects
+COPY <<-"EOF" /etc/nginx/conf.d/default.conf
+server {
+  listen <%= port %>;
+  listen [::]:<%= port %>;
+  root /usr/share/nginx/html;
+  absolute_redirect off;
+  error_page 404 <%= astroBase %>/404.html;
+}
+EOF
+
 <% } -%>
 <% if (options.nginxRoot) { -%>
 # configure nginx
diff --git a/test/frameworks/astro-caddy/.dockerignore b/test/frameworks/astro-caddy/.dockerignore
new file mode 100644
index 0000000..74340d4
--- /dev/null
+++ b/test/frameworks/astro-caddy/.dockerignore
@@ -0,0 +1,6 @@
+/.git
+/node_modules
+.dockerignore
+.env
+Dockerfile
+fly.toml
diff --git a/test/frameworks/astro-caddy/Dockerfile b/test/frameworks/astro-caddy/Dockerfile
new file mode 100644
index 0000000..e722d1a
--- /dev/null
+++ b/test/frameworks/astro-caddy/Dockerfile
@@ -0,0 +1,54 @@
+# syntax = docker/dockerfile:1
+
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=xxx
+FROM node:${NODE_VERSION}-slim AS base
+
+LABEL fly_launch_runtime="Astro"
+
+# Astro app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base AS build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm ci
+
+# Copy application code
+COPY . .
+
+# Build application
+RUN npm run build
+
+
+# Final stage for app image
+FROM caddy:2-alpine
+
+# Copy built application
+COPY --from=build /app/dist /srv
+
+# Serve the site, with its own 404 page
+COPY <<-"EOF" /etc/caddy/Caddyfile
+:80 {
+  root * /srv
+  file_server
+  handle_errors 404 {
+    rewrite * /404.html
+    file_server
+  }
+}
+EOF
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 80
+CMD [ "caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile" ]
diff --git a/test/frameworks/astro-caddy/package-lock.json b/test/frameworks/astro-caddy/package-lock.json
new file mode 100644
index 0000000..16411f2
--- /dev/null
+++ b/test/frameworks/astro-caddy/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "astro-caddy",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/test/frameworks/astro-caddy/package.json b/test/frameworks/astro-caddy/package.json
new file mode 100644
index 0000000..e441f32
--- /dev/null
+++ b/test/frameworks/astro-caddy/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "astro-caddy",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "astro": "^5.15.0"
+  },
+  "dockerfile": {
+    "caddy": true
+  }
+}
diff --git a/test/frameworks/astro-config/.dockerignore b/test/frameworks/astro-config/.dockerignore
new file mode 100644
index 0000000..74340d4
--- /dev/null
+++ b/test/frameworks/astro-config/.dockerignore
@@ -0,0 +1,6 @@
+/.git
+/node_modules
+.dockerignore
+.env
+Dockerfile
+fly.toml
diff --git a/test/frameworks/astro-config/Dockerfile b/test/frameworks/astro-config/Dockerfile
new file mode 100644
index 0000000..d4b975d
--- /dev/null
+++ b/test/frameworks/astro-config/Dockerfile
@@ -0,0 +1,53 @@
+# syntax = docker/dockerfile:1
+
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=xxx
+FROM node:${NODE_VERSION}-slim AS base
+
+LABEL fly_launch_runtime="Astro"
+
+# Astro app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base AS build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm ci --include=dev
+
+# Copy application code
+COPY . .
+
+# Build application
+RUN npm run build
+
+
+# Final stage for app image
+FROM nginx
+
+# Copy built application
+COPY --from=build /app/build /usr/share/nginx/html/docs
+
+# Serve the site, with its own 404 page and relative redirects
+COPY <<-"EOF" /etc/nginx/conf.d/default.conf
+server {
+  listen 80;
+  listen [::]:80;
+  root /usr/share/nginx/html;
+  absolute_redirect off;
+  error_page 404 /docs/404.html;
+}
+EOF
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 80
+CMD [ "/usr/sbin/nginx", "-g", "daemon off;" ]
diff --git a/test/frameworks/astro-config/astro.config.mjs b/test/frameworks/astro-config/astro.config.mjs
new file mode 100644
index 0000000..f344690
--- /dev/null
+++ b/test/frameworks/astro-config/astro.config.mjs
@@ -0,0 +1,8 @@
+// @ts-check
+import { defineConfig } from 'astro/config';
+
+// https://astro.build/config
+export default defineConfig({
+  outDir: './build',
+  base: '/docs',
+});
diff --git a/test/frameworks/astro-config/package-lock.json b/test/frameworks/astro-config/package-lock.json
new file mode 100644
index 0000000..9c1a941
--- /dev/null
+++ b/test/frameworks/astro-config/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "astro-config",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/test/frameworks/astro-config/package.json b/test/frameworks/astro-config/package.json
new file mode 100644
index 0000000..8b68bda
--- /dev/null
+++ b/test/frameworks/astro-config/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "astro-config",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "preview": "astro preview",
+    "astro": "astro"
+  },
+  "devDependencies": {
+    "astro": "^5.15.0"
+  }
+}
diff --git a/test/frameworks/astro-middleware/.dockerignore b/test/frameworks/astro-middleware/.dockerignore
new file mode 100644
index 0000000..74340d4
--- /dev/null
+++ b/test/frameworks/astro-middleware/.dockerignore
@@ -0,0 +1,6 @@
+/.git
+/node_modules
+.dockerignore
+.env
+Dockerfile
+fly.toml
diff --git a/test/frameworks/astro-middleware/Dockerfile b/test/frameworks/astro-middleware/Dockerfile
new file mode 100644
index 0000000..91f3152
--- /dev/null
+++ b/test/frameworks/astro-middleware/Dockerfile
@@ -0,0 +1,42 @@
+# syntax = docker/dockerfile:1
+
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=xxx
+FROM node:${NODE_VERSION}-slim AS base
+
+LABEL fly_launch_runtime="Astro"
+
+# Astro app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base AS build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm ci
+
+# Copy application code
+COPY . .
+
+# Build application
+RUN npm run build
+
+
+# Final stage for app image
+FROM base
+
+# Copy built application
+COPY --from=build /app /app
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 3000
+CMD [ "npm", "run", "start" ]
diff --git a/test/frameworks/astro-middleware/astro.config.mjs b/test/frameworks/astro-middleware/astro.config.mjs
new file mode 100644
index 0000000..81538b6
--- /dev/null
+++ b/test/frameworks/astro-middleware/astro.config.mjs
@@ -0,0 +1,12 @@
+// @ts-check
+import { defineConfig } from 'astro/config';
+
+import node from '@astrojs/node';
+
+// https://astro.build/config
+export default defineConfig({
+  output: 'server',
+  adapter: node({
+    mode: 'middleware'
+  })
+});
diff --git a/test/frameworks/astro-middleware/package-lock.json b/test/frameworks/astro-middleware/package-lock.json
new file mode 100644
index 0000000..44d62f2
--- /dev/null
+++ b/test/frameworks/astro-middleware/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "astro-middleware",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/test/frameworks/astro-middleware/package.json b/test/frameworks/astro-middleware/package.json
new file mode 100644
index 0000000..aa9905d
--- /dev/null
+++ b/test/frameworks/astro-middleware/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "astro-middleware",
+  "type": "module",
+  "version": "0.0.1",
+  "scripts": {
+    "dev": "astro dev",
+    "build": "astro build",
+    "start": "node ./server.mjs",
+    "astro": "astro"
+  },
+  "dependencies": {
+    "@astrojs/node": "^9.5.0",
+    "astro": "^5.15.0",
+    "express": "^5.1.0"
+  }
+}
diff --git a/test/frameworks/astro-static/Dockerfile b/test/frameworks/astro-static/Dockerfile
index 240b22e..272d30f 100644
--- a/test/frameworks/astro-static/Dockerfile
+++ b/test/frameworks/astro-static/Dockerfile
@@ -37,6 +37,17 @@ FROM nginx
 # Copy built application
 COPY --from=build /app/dist /usr/share/nginx/html
 
+# Serve the site, with its own 404 page and relative redirects
+COPY <<-"EOF" /etc/nginx/conf.d/default.conf
+server {
+  listen 80;
+  listen [::]:80;
+  root /usr/share/nginx/html;
+  absolute_redirect off;
+  error_page 404 /404.html;
+}
+EOF
+
 # Start the server by default, this can be overwritten at runtime
 EXPOSE 80
 CMD [ "/usr/sbin/nginx", "-g", "daemon off;" ]
diff --git a/test/frameworks/vite-caddy/.dockerignore b/test/frameworks/vite-caddy/.dockerignore
new file mode 100644
index 0000000..74340d4
--- /dev/null
+++ b/test/frameworks/vite-caddy/.dockerignore
@@ -0,0 +1,6 @@
+/.git
+/node_modules
+.dockerignore
+.env
+Dockerfile
+fly.toml
diff --git a/test/frameworks/vite-caddy/Dockerfile b/test/frameworks/vite-caddy/Dockerfile
new file mode 100644
index 0000000..d38d4a4
--- /dev/null
+++ b/test/frameworks/vite-caddy/Dockerfile
@@ -0,0 +1,53 @@
+# syntax = docker/dockerfile:1
+
+# Adjust NODE_VERSION as desired
+ARG NODE_VERSION=xxx
+FROM node:${NODE_VERSION}-slim AS base
+
+LABEL fly_launch_runtime="Vite"
+
+# Vite app lives here
+WORKDIR /app
+
+# Set production environment
+ENV NODE_ENV="production"
+
+
+# Throw-away build stage to reduce size of final image
+FROM base AS build
+
+# Install packages needed to build node modules
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y build-essential node-gyp pkg-config python-is-python3
+
+# Install node modules
+COPY package-lock.json package.json ./
+RUN npm ci --include=dev
+
+# Copy application code
+COPY . .
+
+# Build application
+RUN npm run build
+
+# Remove development dependencies
+RUN npm prune --omit=dev
+
+
+# Final stage for app image
+FROM caddy:2-alpine
+
+# Copy built application
+COPY --from=build /app/dist /srv
+
+# Serve the site
+COPY <<-"EOF" /etc/caddy/Caddyfile
+:80 {
+  root * /srv
+  file_server
+}
+EOF
+
+# Start the server by default, this can be overwritten at runtime
+EXPOSE 80
+CMD [ "caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile" ]
diff --git a/test/frameworks/vite-caddy/package-lock.json b/test/frameworks/vite-caddy/package-lock.json
new file mode 100644
index 0000000..275dc56
--- /dev/null
+++ b/test/frameworks/vite-caddy/package-lock.json
@@ -0,0 +1,6 @@
+{
+  "name": "vite-caddy",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {}
+}
diff --git a/test/frameworks/vite-caddy/package.json b/test/frameworks/vite-caddy/package.json
new file mode 100644
index 0000000..20ff536
--- /dev/null
+++ b/test/frameworks/vite-caddy/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "vite-caddy",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "devDependencies": {
+    "vite": "^7.1.0"
+  },
+  "dockerfile": {
+    "caddy": true
+  }
+}
diff --git a/test/gdf.test.js b/test/gdf.test.js
index b736c13..381c478 100644
--- a/test/gdf.test.js
+++ b/test/gdf.test.js
@@ -50,6 +50,41 @@ describe('gdf: framework detection', function() {
     expect(gdf.astroSSR).to.equal(true)
   })
 
+  it('detects astro and its adapter in devDependencies', async function() {
+    let gdf = await sandbox().run({ devDependencies: { astro: '^5' } })
+    expect(gdf.runtime).to.equal('Astro')
+    expect(gdf.astroStatic).to.equal(true)
+
+    gdf = await sandbox().run({ dependencies: { astro: '^5' }, devDependencies: { '@astrojs/node': '^9' } })
+    expect(gdf.astroSSR).to.equal(true)
+    // the adapter is needed at runtime, so it must not be pruned
+    expect(sandbox().read('Dockerfile')).not.to.include('npm prune')
+  })
+
+  it('runs the start script for astro middleware mode', async function() {
+    sandbox().write('astro.config.mjs', "export default defineConfig({ adapter: node({ mode: 'middleware' }) })")
+    const gdf = await sandbox().run({ dependencies: { astro: '^5', '@astrojs/node': '^9' }, scripts: { start: 'node server.mjs' } })
+    expect(gdf.astroSSR).to.equal(false)
+    expect(gdf.astroStatic).to.equal(false)
+    expect(gdf.startCommand).to.deep.equal(['npm', 'run', 'start'])
+  })
+
+  it('reads outDir and base from astro.config', async function() {
+    sandbox().write('astro.config.ts', "export default defineConfig({ outDir: './build/', base: 'docs/' })")
+    const gdf = await sandbox().run({ dependencies: { astro: '^5' } })
+    expect(gdf.astroOutDir).to.equal('build')
+    expect(gdf.astroBase).to.equal('/docs')
+    expect(sandbox().read('Dockerfile')).to.include('COPY --from=build /app/build /usr/share/nginx/html/docs')
+  })
+
+  it('serves static sites with caddy when asked', async function() {
+    await sandbox().run({ dependencies: { astro: '^5' } }, { caddy: true })
+    const dockerfile = sandbox().read('Dockerfile')
+    expect(dockerfile).to.include('FROM caddy:2-alpine')
+    expect(dockerfile).to.include('COPY --from=build /app/dist /srv')
+    expect(dockerfile).not.to.include('nginx')
+  })
+
   it('detects trpc only when both client and server are present', async function() {
     let gdf = await sandbox().run({ dependencies: { '@trpc/server': '^10' } })
     expect(gdf.trpc).to.equal(false)