Remote Browser Service

Browser control for AI agents via HTTP API. Supports both DOM-oriented automation

and remote-desktop/VNC control when you need the actual framebuffer.

Index

• Setup
• Core Workflow
• API Reference
• Screenshot
• VNC interface
• VNC screenshot
• Act on elements
• VNC action
• HTML snapshot
• Token Cost Guide
• Environment Variables
• Tips

Setup

Ensure you have an active session:

1. Create session — POST /api/sessions (HTTP, no WebSocket), or open WebSocket to /ws/{session_id} (DevTools CDP), or run from UI. Optional url in body (HTTP) or query (WS) to navigate immediately.
2. Or restore — Use stored session from GET /api/stored-sessions
3. Auth — Pass Authorization: Bearer or X-API-Key, or ?access_token=

Base URL: https://rb.all-completed.com (or RBS_BASE_URL). Replace {session_id} in examples. User ID is derived from the token.

Core Workflow

1. Navigate to a URL
2. Snapshot the accessibility tree (get refs) — GET .../json
3. Act on refs or selectors (click, type, fill, press)
4. Snapshot again to see results

For visual or OS-level flows, use the VNC path instead:

1. Open VNC interface — GET /users/{user_id}/vnc/{session_id} when you want a live noVNC view
2. Capture VNC framebuffer — GET .../vnc/screenshot
3. Send VNC input — POST .../vnc/action with coordinates or keys
4. Capture again to verify pixel-level results

Refs (e0, e1, …) from /json can be used with /action via selector (use ref as selector for e5 → "e5" maps to role/name; for now use CSS selector).

Supported actions by mode:

API Reference

Create session (HTTP)

curl -X POST "https://rb.all-completed.com/api/sessions" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{}'
# Optional: {"session_id": "my-session", "url": "https://example.com"}
# Fork from stored session: {"session_id": "my-fork", "from": "original-session"}
# Ephemeral (start from metadata/fork but don't save): {"ephemeral": true}

Sessions idle for 5 min are closed. Use POST .../ping to keep alive.

Maximum 1 concurrent session per user. If creation returns 429 or WebSocket closes with a limit error: wait a bit (previous session may still be shutting down) and/or close the previous session via DELETE /api/sessions/{session_id} before retrying.

List sessions

curl "https://rb.all-completed.com/api/sessions" \
  -H "Authorization: Bearer <token>"

List stored sessions

curl "https://rb.all-completed.com/api/stored-sessions" \
  -H "Authorization: Bearer <token>"

Returns {sessions: [...], count}. Connect via WebSocket to /ws/{session_id} to resume.

Navigate

curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/navigate" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com"}'

# With timeout (seconds)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/navigate" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com", "timeout": 60}'

Set location

# Set browser geolocation for location-aware sites (testing/dev)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/location" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"latitude": 37.7749, "longitude": -122.4194}'

# With accuracy (meters)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/location" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"latitude": 51.5074, "longitude": -0.1278, "accuracy": 50}'

Image (download by selector)

# Capture a single element (e.g. image) by CSS selector
curl "https://rb.all-completed.com/api/sessions/{session_id}/image?selector=img.hero" \
  -H "Authorization: Bearer <token>" \
  -o image.jpg

# With quality, raw binary (selector=#banner for id)
curl "https://rb.all-completed.com/api/sessions/{session_id}/image?selector=img&quality=90&raw=true" \
  -H "Authorization: Bearer <token>" \
  -o element.jpg

Use selector (CSS) or ref (from snapshot). Returns JPEG of the element's bounding box.

Snapshot (accessibility tree)

# Full tree
curl "https://rb.all-completed.com/api/sessions/{session_id}/json" \
  -H "Authorization: Bearer <token>"

# Interactive elements only (buttons, links, inputs) — much smaller
curl "https://rb.all-completed.com/api/sessions/{session_id}/json?filter=interactive" \
  -H "Authorization: Bearer <token>"

# Limit depth
curl "https://rb.all-completed.com/api/sessions/{session_id}/json?depth=5" \
  -H "Authorization: Bearer <token>"

Returns {nodes: [{ref, role, name, depth, value?, disabled?, focused?, nodeId?}], count}.

Extract text

# Readability mode (default) — keeps the main article body
curl "https://rb.all-completed.com/api/sessions/{session_id}/text" \
  -H "Authorization: Bearer <token>"

# Raw innerText
curl "https://rb.all-completed.com/api/sessions/{session_id}/text?mode=raw" \
  -H "Authorization: Bearer <token>"

Returns {url, title, text}. Cheapest option (~800 tokens for most pages).

Screenshot

# JSON with base64
curl "https://rb.all-completed.com/api/sessions/{session_id}/screenshot" \
  -H "Authorization: Bearer <token>"

# Raw JPEG bytes
curl "https://rb.all-completed.com/api/sessions/{session_id}/screenshot?raw=true" \
  -H "Authorization: Bearer <token>" \
  -o screenshot.jpg

# With quality (1-100)
curl "https://rb.all-completed.com/api/sessions/{session_id}/screenshot?quality=50&raw=true" \
  -H "Authorization: Bearer <token>" \
  -o screenshot.jpg

# Region capture (offset x,y and width,height in CSS pixels)
curl "https://rb.all-completed.com/api/sessions/{session_id}/screenshot?x=0&y=0&width=800&height=600&raw=true" \
  -H "Authorization: Bearer <token>" \
  -o region.jpg

Use this when Chrome DevTools rendering is enough. If you need browser chrome,

OS dialogs, permission prompts, or the exact remote desktop pixels, use

/vnc/screenshot instead.

VNC interface

# Built-in noVNC client page for a session
open "https://rb.all-completed.com/users/{user_id}/vnc/{session_id}"

# Under the hood the page connects to the VNC websocket proxy
# /users/{user_id}/vnc/ws/{session_id}

Use the VNC interface when you need a live remote-desktop view of the session

instead of DOM snapshots.

VNC screenshot

# Raw PNG bytes from the VNC framebuffer
curl "https://rb.all-completed.com/api/sessions/{session_id}/vnc/screenshot?raw=true" \
  -H "Authorization: Bearer <token>" \
  -o screen.png

# Cropped framebuffer region
curl "https://rb.all-completed.com/api/sessions/{session_id}/vnc/screenshot?x=0&y=0&width=800&height=600&raw=true" \
  -H "Authorization: Bearer <token>" \
  -o region.png

Unlike /screenshot, this captures the VNC framebuffer directly. Use it for

browser chrome, native permission prompts, OS-level dialogs, or anything only

visible in the remote desktop.

Page size

# Get page content dimensions (use with screenshot clip)
curl "https://rb.all-completed.com/api/sessions/{session_id}/page-size" \
  -H "Authorization: Bearer <token>"

Returns {width, height} in CSS pixels.

Act on elements

# Click by selector
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "click", "selector": "button.submit"}'

# Click by coordinates (viewport x,y)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "click", "x": 100, "y": 200}'

# Type into element (focus + insertText)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "type", "selector": "#email", "text": "user@example.com"}'

# Fill (set value directly)
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "fill", "selector": "#email", "text": "user@example.com"}'

# Press a key
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "press", "key": "Enter"}'
# Press Enter in a specific input: -d '{"kind": "press", "key": "Enter", "selector": "input#search"}'

# Focus, hover, select, scroll
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "focus", "selector": "input[name=search]"}'

curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind": "scroll", "scrollY": 800}'

Action kinds: click, type, fill, press, focus, hover, select, scroll. Use selector (CSS) or ref (from snapshot). For click you can use x and y (viewport coordinates) instead of selector. For fill, the server focuses the field, select() only if the field already has text (then Input.insertText replaces), otherwise focuses and inserts like type—controlled inputs (e.g. React) update reliably. For press use key (e.g. Enter, Tab, Escape, Space, ArrowUp); optional selector focuses element first.

VNC action

# Move mouse
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/vnc/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind":"move","x":320,"y":240}'

# Click at framebuffer coordinates
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/vnc/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind":"click","x":320,"y":240,"button":"left","repeat":1}'

# Press keys directly over VNC
curl -X POST "https://rb.all-completed.com/api/sessions/{session_id}/vnc/action" \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{"kind":"press","keys":["Ctrl","l"]}'

VNC action kinds: move, click, type, press, scroll.

These actions are framebuffer-oriented and do not use DOM selectors. Prefer them

when DOM automation cannot see or control the target UI.

HTML snapshot

# Full DOM with inlined CSS (opens in browser)
curl "https://rb.all-completed.com/api/sessions/{session_id}/html" \
  -H "Authorization: Bearer <token>"

Token Cost Guide

Strategy: Use /text when you only need content. Use /json?filter=interactive for action-oriented tasks. Use full /json for complete page understanding. Use /screenshot for Chrome-rendered visual checks. Use /vnc/screenshot and /vnc/action when you need the real remote desktop surface.

Environment Variables

Tips

• Session required — Ensure a session exists before calling navigate/json/text/action. Create via POST /api/sessions (HTTP), WebSocket, or restore from stored sessions.
• 429 / session limit — If create fails with 429 or WebSocket closes (limit exceeded): wait a few seconds and/or terminate the existing session with DELETE /api/sessions/{session_id} first, then retry.
• Refs from snapshot — Use selector with the ref string (e.g. "e5") when the action API supports ref→DOM resolution; otherwise prefer CSS selectors.
• Readability vs raw — /text (default) returns the main article body; ?mode=raw returns full innerText.
• Interactive filter — ?filter=interactive on /json reduces nodes by ~75% for action tasks.
• VNC vs DOM — Use /action for selectors/refs in the page DOM. Use /vnc/action and /vnc/screenshot for pixel-level automation and UI outside the DOM.
• Stored sessions — Sessions persist to S3 when WebSocket closes (cookies, localStorage, sessionStorage, metadata). List with GET /api/stored-sessions, then connect via WebSocket to resume. If url is not provided on connect, the saved page URL is used for redirect. Use GET/PUT /api/stored-sessions/{session_id} to read or update metadata (e.g. redirect URL).