Boxed Curl

Run curl requests safely in a sandbox, supporting GET/POST/HTTP headers, with complete network isolation.

Boxed Curl Skill

Run curl-like HTTP requests safely within a WASM sandbox with network access control.

Triggering Method

Use this skill when the user says:

• "boxed curl", "boxed curl"
• "Sandbox version of curl", "Sandbox curl", "Secure curl"
• "Make a request using boxed-curl", "Help me with boxed-curl"
• "Send a secure HTTP request", "Secure GET/POST request"
• "沙箱版 curl"、"沙箱 curl"、"安全的 curl"
• "用 boxed-curl 请求"、"帮我 boxed-curl"
• "发一个安全的 HTTP 请求"、"安全的 GET/POST 请求"

⚠️ Required Plugin

This skill requires the openclaw-wasm-sandbox plugin version >= 0.2.0.

The wasm-sandbox-download tool was added in version 0.2.0. If the plugin is not installed or version is lower:

openclaw plugins install clawhub:openclaw-wasm-sandbox
openclaw plugins update openclaw-wasm-sandbox
openclaw gateway restart

Verify the version:

openclaw plugins inspect openclaw-wasm-sandbox

Look for Version: 0.2.0 or higher in the output.

⚠️ WASM File Required

This skill requires the WASM component file to be downloaded first.

If the WASM file does not exist locally, use the wasm-sandbox-download tool to download it:

Step 0: Download WASM File

wasm-sandbox-download({
  url: "https://raw.githubusercontent.com/guyoung/wasm-sandbox-openclaw-skills/main/boxed-curl/files/boxed_curl_component.wasm",
  output: "<skill_dir>/files/boxed_curl_component.wasm",
  resume: false,
  timeout: 60000
})

Important: Set resume: false for initial download. The download destination is github.com which supports resume.

Tool: wasm-sandbox-run

Use the wasm-sandbox-run tool to execute the WASM component after the WASM file is available.

How It Works

1. Check for WASM file — If not found, download using wasm-sandbox-download
2. User provides curl-like arguments (URL with optional options)
3. AI extracts the URL and any curl options
4. AI determines allowedOutboundHosts based on the target host
5. AI calls wasm-sandbox-run with the arguments and network permissions

Supported Features

Option	Description	Status
-X, --request METHOD	HTTP method (GET, POST, PUT, DELETE, etc.)	✅
-H, --header HEADER	Add request header	✅
-d, --data DATA	Request body data	✅
-i, --include	Include response headers	✅
-L, --location	Follow redirects	✅
-v, --verbose	Verbose output	✅
-o, --output FILE	Output to file	⚠️ Not supported

Usage Pattern

Step 1: Extract Arguments

Parse the user's input:

• URL — the target endpoint
• curl options — -X, -H, -d, etc.
• allowedOutboundHosts — if user explicitly provided it

Step 2: Determine Network Access

If user did NOT specify allowedOutboundHosts, infer from URL:

URL Pattern	allowedOutboundHosts
https://api.github.com/*	https://api.github.com
https://httpbin.org/*	https://httpbin.org
https://raw.githubusercontent.com/*	https://raw.githubusercontent.com
Any HTTPS URL	https://<host> (extract host from URL)

Step 3: Call wasm-sandbox-run

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://<target-host>"],
  args: ["<curl options>", "<URL>"]
})

Examples

GET Request

User says: "fetch data from https://httpbin.org/get"

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://httpbin.org"],
  args: ["https://httpbin.org/get"]
})

POST with JSON Body

User says: curl -X POST https://httpbin.org/post -H "Content-Type: application/json" -d '{"name":"value"}'

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://httpbin.org"],
  args: ["-X", "POST", "-H", "Content-Type:application/json", "-d", "{\"name\":\"value\"}", "https://httpbin.org/post"]
})

GET with Headers

User says: "fetch with custom Authorization header"

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://httpbin.org"],
  args: ["-H", "Authorization:Bearer token123", "https://httpbin.org/get"]
})

GitHub API Request

User says: "get GitHub user info for 'octocat'"

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://api.github.com"],
  args: ["https://api.github.com/users/octocat"]
})

GET with Response Headers

User says: "fetch with -i flag to see response headers"

wasm-sandbox-run({
  wasmFile: "<skill_dir>/files/boxed_curl_component.wasm",
  allowedOutboundHosts: ["https://httpbin.org"],
  args: ["-i", "https://httpbin.org/get"]
})

Important Notes

• Always set allowedOutboundHosts — sandbox blocks all outbound HTTP by default
• Download WASM first if missing — use wasm-sandbox-download tool
• Extract host from URL automatically when user doesn't specify
• Use /post endpoint for POST — /get returns 405 Method Not Allowed
• args order: curl options first, URL last
• JSON in -d: escape quotes properly (e.g., {\"key\":\"value\"})