servo-fetch-cli-0.9.0 is not a library.

servo-fetch-cli

A browser engine in a binary — fetch, render, and extract web content powered by Servo.

For programmatic use in Rust, see the servo-fetch library crate.

Install

Pre-built binaries (recommended)

curl -fsSL https://raw.githubusercontent.com/konippi/servo-fetch/main/install.sh | sh

Cargo

cargo binstall servo-fetch-cli   # prebuilt binary via cargo-binstall
cargo install servo-fetch-cli    # build from source (requires Rust 1.86.0+)

Usage

Extract content

servo-fetch "https://example.com"              # Readable Markdown (default)
servo-fetch "https://example.com" --json       # Structured JSON
servo-fetch "https://example.com" --raw html   # Raw rendered HTML
servo-fetch "https://example.com" --raw text   # Plain text (innerText)

Batch fetch

servo-fetch URL1 URL2 URL3                     # Parallel fetch, Markdown output
servo-fetch URL1 URL2 --json                   # Parallel fetch, NDJSON output

Screenshots

servo-fetch "https://example.com" --screenshot page.png
servo-fetch "https://example.com" --screenshot full.png --full-page

JavaScript execution

servo-fetch "https://example.com" --js "document.title"
servo-fetch "https://example.com" --js "document.querySelectorAll('h2').length"

CSS selector extraction

servo-fetch "https://example.com" --selector "article"
servo-fetch "https://example.com" --selector ".main-content" --json

Crawl a site

servo-fetch crawl "https://docs.example.com" --limit 20
servo-fetch crawl "https://docs.example.com" --include "/docs/**" --exclude "/docs/archive/**"
servo-fetch crawl "https://docs.example.com" --json --max-depth 5

Discover URLs (sitemap)

servo-fetch map "https://example.com"
servo-fetch map "https://example.com" --limit 100 --include "/blog/**"

SPA / dynamic content

servo-fetch "https://spa.example.com" --settle 3000       # Wait 3s after load for hydration
servo-fetch "https://spa.example.com" -t 60 --settle 5000 # 60s timeout + 5s settle

MCP server

servo-fetch mcp                # stdio transport (for AI agents)
servo-fetch mcp --port 8080    # Streamable HTTP transport

HTTP API server

servo-fetch serve                            # 127.0.0.1:3000
servo-fetch serve --host 0.0.0.0 --port 80   # expose to network

See HTTP API server below for the endpoint reference.

Options

Flag	Description
`--json`	Structured JSON output (NDJSON for multiple URLs)
`--screenshot <FILE>`	Save PNG screenshot
`--full-page`	Capture full scrollable page (requires `--screenshot`)
`--js <EXPR>`	Execute JavaScript and print result
`--selector <CSS>`	Extract specific section by CSS selector
`--raw html\|text`	Raw HTML or plain text output
`-t, --timeout <SECS>`	Page load timeout in seconds (default: 30)
`--settle <MS>`	Extra wait after load event in ms (default: 0, max: 10000)
`--user-agent <UA>`	Override the User-Agent string
`-v, --verbose`	Increase log verbosity (`-v` info, `-vv` debug, `-vvv` trace)
`-q, --quiet`	Suppress all logs except errors

JSON output

--json returns an object with these fields:

Field	Type	Description
`title`	string	Page title
`content`	string	Raw HTML extracted by Readability
`text_content`	string	Readable text (Markdown)
`byline`	string	Author or byline (omitted if not detected)
`excerpt`	string	Short excerpt or description (omitted if not detected)
`lang`	string	Document language (omitted if not detected)
`url`	string	Canonical URL (omitted if not detected)

Crawl subcommand

servo-fetch crawl <URL> follows same-site links using BFS. Respects robots.txt (RFC 9309) with a minimum 500ms interval.

Flag	Description
`--limit <N>`	Maximum pages to crawl (default: 50)
`--max-depth <N>`	Maximum link depth (default: 3)
`--include <GLOB>`	URL path patterns to include
`--exclude <GLOB>`	URL path patterns to exclude
`--json`	Output content as JSON per page
`--selector <CSS>`	Extract specific section per page
`--user-agent <UA>`	Override the User-Agent string
`-t, --timeout <SECS>`	Page load timeout in seconds per page (default: 30)
`--settle <MS>`	Extra wait after load event in ms per page (default: 0, max: 10000)

Map subcommand

servo-fetch map <URL> discovers all URLs on a site via sitemaps without rendering. Falls back to HTML link extraction if no sitemap exists.

Flag	Description
`--limit <N>`	Maximum URLs to return (default: 5000)
`--include <GLOB>`	URL path patterns to include
`--exclude <GLOB>`	URL path patterns to exclude
`--json`	Output as JSON array with lastmod metadata
`--user-agent <UA>`	Override the User-Agent string
`-t, --timeout <SECS>`	HTTP request timeout in seconds (default: 30)
`--no-fallback`	Skip HTML link extraction fallback

Logging

Diagnostic messages go to stderr; stdout is reserved for data output so pipes stay clean.

servo-fetch -v "https://example.com"                       # info and above
servo-fetch -vv "https://example.com"                      # debug
servo-fetch -vvv "https://example.com"                     # trace
servo-fetch -q "https://example.com"                       # errors only
RUST_LOG="servo_fetch=debug" servo-fetch "https://..."     # fine-grained override
RUST_LOG="servo_fetch=trace,servo=debug" servo-fetch "..." # include Servo internals

RUST_LOG uses tracing-subscriber's directive syntax and always wins over CLI flags.

Environment Variables

Variable	Description
`SERVO_FETCH_USER_AGENT`	Default User-Agent string (overridden by `--user-agent`)
`SERVO_FETCH_NO_STDERR_FILTER`	Disable Apple OpenGL driver noise filter (debug use)
`RUST_LOG`	Fine-grained log filter (overrides `-v`/`-q`)

MCP Server

Built-in Model Context Protocol server over stdio or Streamable HTTP.

{
  "mcpServers": {
    "servo-fetch": {
      "command": "servo-fetch",
      "args": ["mcp"]
    }
  }
}

Streamable HTTP: servo-fetch mcp --port 8080

Parameter	Type	Description
`url`	string	URL to fetch (http/https only)
`format`	string?	`markdown` (default), `json`, `html`, `text`, or `accessibility_tree`
`max_length`	number?	Max characters to return (default 5000)
`start_index`	number?	Character offset for pagination (default 0)
`timeout`	number?	Page load timeout in seconds (default 30)
`settle_ms`	number?	Extra wait in ms after load event (default 0, max 10000)
`selector`	string?	CSS selector to extract a specific section

Parameter	Type	Description
`urls`	string[]	URLs to fetch (http/https only, max 20)
`format`	string?	`markdown` (default) or `json`
`max_length`	number?	Max characters per URL result (default 5000)
`timeout`	number?	Page load timeout in seconds per URL (default 30)
`settle_ms`	number?	Extra wait in ms after load event (default 0, max 10000)
`selector`	string?	CSS selector to extract a specific section

Parameter	Type	Description
`url`	string	Starting URL (http/https only)
`limit`	number?	Maximum pages to crawl (default 20, max 500)
`max_depth`	number?	Maximum link depth from seed (default 3, max 10)
`format`	string?	`markdown` (default) or `json`
`include_glob`	string[]?	URL path patterns to include
`exclude_glob`	string[]?	URL path patterns to exclude
`max_length`	number?	Max characters per page result (default 5000)
`timeout`	number?	Page load timeout in seconds per page (default 30)
`settle_ms`	number?	Extra wait in ms after load event (default 0, max 10000)
`selector`	string?	CSS selector to extract a specific section per page

Parameter	Type	Description
`url`	string	Site URL to discover pages for (http/https only)
`limit`	number?	Maximum URLs to return (default 5000)
`include_glob`	string[]?	URL path patterns to include
`exclude_glob`	string[]?	URL path patterns to exclude

Parameter	Type	Description
`url`	string	URL to capture (http/https only)
`full_page`	boolean?	Capture the full scrollable page (default false)
`timeout`	number?	Page load timeout in seconds (default 30)
`settle_ms`	number?	Extra wait in ms after load event (default 0, max 10000)

Parameter	Type	Description
`url`	string	URL to load before executing JS
`expression`	string	JavaScript expression to evaluate
`timeout`	number?	Page load timeout in seconds (default 30)
`settle_ms`	number?	Extra wait in ms after load event (default 0, max 10000)

HTTP API server

servo-fetch serve starts a REST API on the given host/port (default 127.0.0.1:3000). JSON request/response, binary PNG for screenshots.

Flag	Description
`--host <HOST>`	Bind address (default `127.0.0.1`)
`--port <PORT>`	TCP port (default `3000`)

Responses include x-request-id (auto-generated if the request does not supply one); use this for tracing in logs. Errors use a consistent {"error": "..."} JSON shape across all endpoints. Request bodies are capped at 1 MiB. SSRF protection (private/reserved address blocking) applies to every endpoint.

Endpoints

Method	Path	Description
`GET`	`/health`	Liveness probe (`{"status":"ok"}`)
`GET`	`/version`	`{"name":"servo-fetch","version":"..."}`
`POST`	`/v1/fetch`	Fetch one URL; returns extracted content
`POST`	`/v1/batch_fetch`	Fetch up to 20 URLs in parallel
`POST`	`/v1/screenshot`	Capture a PNG; `image/png` body
`POST`	`/v1/execute_js`	Evaluate JavaScript in a loaded page
`POST`	`/v1/crawl`	BFS crawl starting from a URL
`POST`	`/v1/map`	Discover URLs via sitemaps (no rendering)

Request and response shapes mirror the MCP tool parameters documented above.

Examples

# Fetch → Markdown
curl -X POST http://127.0.0.1:3000/v1/fetch \
  -H 'content-type: application/json' \
  -d '{"url":"https://example.com"}'

# Screenshot → PNG
curl -X POST http://127.0.0.1:3000/v1/screenshot \
  -H 'content-type: application/json' \
  -d '{"url":"https://example.com","full_page":true}' \
  -o page.png

Docker

Multi-arch image (linux/amd64, linux/arm64) on GitHub Container Registry:

docker run --rm -p 3000:3000 ghcr.io/konippi/servo-fetch:latest

Override the default serve with any servo-fetch subcommand:

docker run --rm ghcr.io/konippi/servo-fetch:latest https://example.com
docker run --rm ghcr.io/konippi/servo-fetch:latest --version

Minimum-privilege deployment:

docker run --rm -p 3000:3000 \
  --read-only --tmpfs /tmp \
  --cap-drop=ALL \
  --security-opt=no-new-privileges \
  ghcr.io/konippi/servo-fetch:latest

The image runs as UID 1001 and includes a HEALTHCHECK against /health.

Image signing

Images are signed with cosign keyless via GitHub OIDC and ship with SLSA build provenance and an SPDX SBOM as OCI attestations.

cosign verify ghcr.io/konippi/servo-fetch:latest \
  --certificate-identity-regexp '^https://github.com/konippi/servo-fetch/' \
  --certificate-oidc-issuer https://token.actions.githubusercontent.com

servo-fetch-cli 0.9.0

servo-fetch-cli

Install

Pre-built binaries (recommended)

Cargo

Usage

Extract content

Batch fetch

Screenshots

JavaScript execution

CSS selector extraction

Crawl a site

Discover URLs (sitemap)

SPA / dynamic content

MCP server

HTTP API server

Options

JSON output

Crawl subcommand

Map subcommand

Logging

Environment Variables

MCP Server

HTTP API server

Endpoints

Examples

Docker

Image signing