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SocketPipe Protocol Specification

Version: 1.0.0-draft
Status: Draft
Date: 2026-02-09

SocketPipe is an open protocol for transporting terminal I/O between web-based clients and backend services over WebSocket connections.

Table of Contents

Overview

SocketPipe standardizes how web-based terminal clients (such as xterm.js or ghostty-wasm) communicate with backend services through proxy servers. It supports two operational modes:

  • Tunnel Mode: Raw TCP passthrough for already-encrypted protocols (e.g., SSH)
  • PTY Mode: Terminated connections with plaintext terminal I/O
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070', 'lineColor': '#404040'}}}%%
graph LR
    subgraph "Browser"
        C[Web Terminal Client]
    end
    
    subgraph "Proxy Server"
        P[SocketPipe Proxy]
    end
    
    subgraph "Backend"
        S1[SSHd]
        S2[Other TCP Service]
    end
    
    C <-->|WebSocket| P
    P <-->|TCP/SSH| S1
    P <-->|TCP| S2
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Design Goals

  • Interoperability: Any compliant client works with any compliant server
  • Efficiency: Minimal overhead binary framing for real-time terminal interaction
  • Security: Clear security boundaries with mode-appropriate encryption requirements
  • Simplicity: Easy to implement in any language

Non-Goals

  • Client UI implementation
  • Server-side credential storage
  • Logging/audit format specification

Architecture

Operational Modes

SocketPipe supports two distinct modes, each exposed on a separate endpoint:

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070', 'lineColor': '#404040'}}}%%
graph TB
    subgraph "Tunnel Mode (/tunnel)"
        direction LR
        TC[Client] -->|"WebSocket<br/>(ws:// or wss://)"| TP[Proxy]
        TP -->|"Raw TCP"| TS[Backend:port]
        
        note1["• Transparent TCP pipe<br/>• Client handles SSH encryption<br/>• Any TCP protocol supported"]
    end
    
    subgraph "PTY Mode (/pty)"
        direction LR
        PC[Client] -->|"WebSocket<br/>(wss:// only)"| PP[Proxy]
        PP -->|"SSH"| PS[SSHd]
        
        note2["• Proxy terminates SSH<br/>• Plaintext PTY I/O over WebSocket<br/>• Supports resize, signals, env vars"]
    end
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Mode Comparison

Aspect Tunnel Mode (/tunnel) PTY Mode (/pty)
Data Encrypted SSH bytes Plaintext terminal I/O
TLS Optional Required
Backend Any TCP service SSH only
Client responsibility Full SSH handling Terminal emulation only
Use case SSH client in browser Simple terminal access

Transport

Requirements

  • WebSocket: MUST be the primary transport
  • Binary frames: MUST use binary WebSocket frames (opcode 0x02)
  • Byte order: MUST use big-endian (network byte order) for multi-byte fields

Endpoints

Endpoint TLS Requirement Description
/tunnel MAY use ws:// or wss:// Raw TCP tunnel
/pty MUST use wss:// only Terminated SSH with PTY

Protocol

Connection Lifecycle

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant S as Server
    participant B as Backend

    C->>S: WebSocket Connect
    S-->>C: WebSocket Accept
    
    C->>S: HANDSHAKE_REQUEST
    S->>B: TCP Connect (if tunnel) or SSH Connect (if pty)
    B-->>S: Connection Established
    S-->>C: HANDSHAKE_RESPONSE (success)
    
    loop Data Transfer
        C->>S: DATA
        S->>B: Forward
        B-->>S: Response
        S-->>C: DATA
    end
    
    alt Keepalive
        C->>S: PING
        S-->>C: PONG
    end
    
    C->>S: CLOSE
    S->>B: Disconnect
    S-->>C: CLOSE (ack)
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Frame Format

All messages use an 8-byte header followed by an optional payload:

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Type      |     Flags     |           Reserved            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Payload Length                        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Payload (variable)                  ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Offset Field Size Description
0 Type 1 byte Message type identifier
1 Flags 1 byte Message-specific flags
2 Reserved 2 bytes MUST be 0x0000
4 Payload Length 4 bytes Payload size in bytes
8 Payload variable Message-specific data 
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070'}}}%%
packet-beta
  0-7: "Type (1 byte)"
  8-15: "Flags (1 byte)"
  16-31: "Reserved (2 bytes, must be 0x0000)"
  32-63: "Payload Length (4 bytes, big-endian)"
  64-127: "Payload (variable length)"
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Message Types

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070', 'lineColor': '#404040'}}}%%
graph TD
    subgraph "Handshake (0x01-0x0F)"
        H1[0x01 HANDSHAKE_REQUEST]
        H2[0x02 HANDSHAKE_RESPONSE]
    end
    
    subgraph "Data (0x10-0x1F)"
        D1[0x10 DATA]
    end
    
    subgraph "Control (0x20-0x2F)"
        C1[0x20 RESIZE]
        C2[0x21 SIGNAL]
        C3[0x22 ENV]
        C4[0x23 FLOW_CONTROL]
    end
    
    subgraph "Keepalive (0x30-0x3F)"
        K1[0x30 PING]
        K2[0x31 PONG]
    end
    
    subgraph "Session (0x40-0x4F)"
        S1[0x40 CLOSE]
    end
    
    subgraph "Error (0xF0-0xFF)"
        E1[0xF0 ERROR]
    end
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Type Name Direction Support Description
0x01 HANDSHAKE_REQUEST C→S MUST Client initiates connection
0x02 HANDSHAKE_RESPONSE S→C MUST Server accepts/rejects
0x10 DATA Both MUST Terminal/tunnel data
0x20 RESIZE C→S MUST Terminal resize (PTY only)
0x21 SIGNAL C→S SHOULD Send signal (PTY only)
0x22 ENV C→S SHOULD Set env var (PTY only)
0x23 FLOW_CONTROL Both SHOULD XON/XOFF
0x30 PING Both MUST Keepalive request
0x31 PONG Both MUST Keepalive response
0x40 CLOSE Both MUST Graceful close
0xF0 ERROR S→C MUST Error notification

Handshake

The handshake MUST be the first exchange after WebSocket connection establishment.

HANDSHAKE_REQUEST (0x01)

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070'}}}%%
packet-beta
  0-7: "Version Major"
  8-15: "Version Minor"
  16-31: "Target Port"
  32-47: "Ping Interval (sec)"
  48-63: "Ping Timeout (sec)"
  64-95: "Max Message Size"
  96-103: "Host Length"
  104-159: "Target Host (variable)"
  160-175: "Token Length"
  176-255: "Token (variable)"
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Field Size Description
Version Major 1 byte Protocol major version (current: 1)
Version Minor 1 byte Protocol minor version (current: 0)
Target Port 2 bytes Backend port number
Ping Interval 2 bytes Requested ping interval (0 = default)
Ping Timeout 2 bytes Requested ping timeout (0 = default)
Max Message Size 4 bytes Requested max size (0 = default)
Host Length 1 byte Length of hostname
Target Host variable Hostname or IP (UTF-8)
Token Length 2 bytes Length of auth token
Token variable Authentication token

Negotiable Parameters & Defaults:

Parameter Default Description
Ping Interval 30 seconds How often to send PING
Ping Timeout 10 seconds How long to wait for PONG
Max Message Size 65536 bytes Maximum DATA payload size

HANDSHAKE_RESPONSE (0x02)

Flags:

  • Bit 0: 1 = Success, 0 = Failure

Success Payload:

Field Size Description
Version Major 1 byte Server's protocol version
Version Minor 1 byte Server's protocol version
Ping Interval 2 bytes Negotiated interval
Ping Timeout 2 bytes Negotiated timeout
Max Message Size 4 bytes Negotiated max size

Failure Payload:

Field Size Description
Error Code 2 bytes Error code
Message Length 1 byte Length of message
Message variable Human-readable error (UTF-8)

Handshake State Machine

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#808080', 'secondaryColor': '#909090', 'tertiaryColor': '#707070', 'stateLabelColor': '#000000', 'compositeBackground': '#a0a0a0', 'lineColor': '#404040'}}}%%
stateDiagram-v2
    [*] --> CONNECTING: WebSocket Open
    CONNECTING --> HANDSHAKING: Send HANDSHAKE_REQUEST
    HANDSHAKING --> ESTABLISHED: Receive HANDSHAKE_RESPONSE (success)
    HANDSHAKING --> CLOSED: Receive HANDSHAKE_RESPONSE (failure)
    HANDSHAKING --> CLOSED: Timeout
    ESTABLISHED --> CLOSING: Send/Receive CLOSE
    ESTABLISHED --> CLOSED: Error
    CLOSING --> CLOSED: Close Complete
    CLOSED --> [*]
Loading

Data Transfer

DATA (0x10)

Carries terminal I/O (PTY mode) or raw TCP bytes (tunnel mode).

Payload: Raw bytes to forward. No additional framing.

Constraints:

  • MUST NOT exceed negotiated Max Message Size
  • No minimum size (empty DATA is valid but not useful)
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant P as Proxy
    participant B as Backend
    
    Note over C,B: Bidirectional data flow
    
    C->>P: DATA (user keystroke)
    P->>B: Forward bytes
    B-->>P: Response bytes
    P-->>C: DATA (terminal output)
    
    Note over C,B: High-throughput scenario
    B-->>P: Large output (e.g., cat file)
    P-->>C: DATA (chunk 1)
    P-->>C: DATA (chunk 2)
    P-->>C: DATA (chunk n)
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Control Messages

Control messages are used for PTY-specific functionality. They MAY be ignored in tunnel mode.

RESIZE (0x20) — MUST support

Notifies server of terminal dimension change.

Field Size Description
Columns 2 bytes Terminal width in characters
Rows 2 bytes Terminal height in characters
Pixel Width 2 bytes Terminal width in pixels (0 if unknown)
Pixel Height 2 bytes Terminal height in pixels (0 if unknown) 
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant P as Proxy
    participant PTY as PTY/Shell
    
    Note over C: User resizes browser window
    C->>P: RESIZE (cols=120, rows=40)
    P->>PTY: ioctl(TIOCSWINSZ)
    PTY-->>PTY: SIGWINCH to shell
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SIGNAL (0x21) — SHOULD support

Sends a signal to the PTY process.

Field Size Description
Signal 1 byte Signal identifier
Value Signal Typical Use
0x01 SIGINT Ctrl+C
0x02 SIGTERM Graceful termination
0x03 SIGHUP Hangup
0x04 SIGKILL Force kill

ENV (0x22) — SHOULD support

Sets an environment variable. MUST be sent before the first DATA message.

Field Size Description
Name Length 1 byte Length of variable name
Name variable Variable name (UTF-8)
Value Length 2 bytes Length of value
Value variable Variable value (UTF-8) 
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant P as Proxy
    
    C->>P: HANDSHAKE_REQUEST
    P-->>C: HANDSHAKE_RESPONSE (success)
    C->>P: ENV (TERM=xterm-256color)
    C->>P: ENV (LANG=en_US.UTF-8)
    C->>P: DATA (first input)
    Note over C,P: ENV messages after DATA are ignored
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FLOW_CONTROL (0x23) — SHOULD support

XON/XOFF flow control signaling.

Flags:

  • Bit 0: 1 = XON (resume), 0 = XOFF (pause)

Payload: Empty.

Keepalive

Keepalive ensures connection liveness and detects stale connections.

PING (0x30)

Either side MAY send PING at any time.

Payload: Optional opaque data (up to 125 bytes recommended).

PONG (0x31)

Response to PING.

Payload: MUST echo the PING payload exactly.

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant S as Server
    
    Note over C,S: Normal keepalive
    C->>S: PING (payload: 0xDEADBEEF)
    S-->>C: PONG (payload: 0xDEADBEEF)
    
    Note over C,S: Timeout scenario
    C->>S: PING
    Note over S: Server unresponsive
    Note over C: No PONG within timeout
    C->>S: CLOSE (timeout)
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Requirements:

  • MUST respond to PING with PONG within negotiated timeout
  • SHOULD send PING at negotiated interval when idle
  • SHOULD close connection if PONG not received within timeout

Session Management

CLOSE (0x40)

Initiates graceful connection close.

Flags:

  • Bit 0: 1 = Client-initiated, 0 = Server-initiated

Payload:

Field Size Description
Reason Code 2 bytes Close reason
Message Length 1 byte Length of message
Message variable Human-readable reason (UTF-8) 
%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant C as Client
    participant P as Proxy
    participant B as Backend
    
    alt Client-initiated close
        C->>P: CLOSE (reason: user disconnect)
        P->>B: Close TCP/SSH
        P-->>C: CLOSE (ack)
    else Backend-initiated close
        B-->>P: Connection closed
        P-->>C: CLOSE (reason: backend closed)
    else Error close
        P-->>C: ERROR (code: 2003)
        P-->>C: CLOSE
    end
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Error Handling

ERROR (0xF0)

Server reports an error condition.

Payload:

Field Size Description
Error Code 2 bytes Error code
Message Length 1 byte Length of message
Message variable Human-readable error (UTF-8)

Error Codes

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070', 'lineColor': '#404040'}}}%%
graph TD
    subgraph "1xxx: Authentication"
        E1000[1000 AUTH_FAILED]
        E1001[1001 AUTH_EXPIRED]
        E1002[1002 AUTH_INSUFFICIENT]
    end
    
    subgraph "2xxx: Connection"
        E2000[2000 CONNECT_FAILED]
        E2001[2001 CONNECT_TIMEOUT]
        E2002[2002 CONNECT_REFUSED]
        E2003[2003 BACKEND_CLOSED]
    end
    
    subgraph "3xxx: Protocol"
        E3000[3000 PROTOCOL_ERROR]
        E3001[3001 INVALID_MESSAGE]
        E3002[3002 INVALID_STATE]
        E3003[3003 MESSAGE_TOO_LARGE]
        E3004[3004 UNSUPPORTED_VERSION]
    end
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Code Name Description
1000 AUTH_FAILED Token validation failed
1001 AUTH_EXPIRED Token has expired
1002 AUTH_INSUFFICIENT Token lacks required permissions
2000 CONNECT_FAILED Failed to connect to backend
2001 CONNECT_TIMEOUT Backend connection timed out
2002 CONNECT_REFUSED Backend refused connection
2003 BACKEND_CLOSED Backend closed connection
3000 PROTOCOL_ERROR Generic protocol violation
3001 INVALID_MESSAGE Malformed message
3002 INVALID_STATE Message invalid in current state
3003 MESSAGE_TOO_LARGE Message exceeds max size
3004 UNSUPPORTED_VERSION Protocol version not supported

Security

Authentication

  • Clients MUST present a token in HANDSHAKE_REQUEST
  • Servers MUST validate tokens before establishing backend connections
  • Token format (JWT, opaque, etc.) is implementation-defined

Transport Security

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'primaryColor': '#909090', 'secondaryColor': '#808080', 'tertiaryColor': '#707070', 'lineColor': '#404040'}}}%%
graph TB
    subgraph "Tunnel Mode"
        T1[Client] -->|"ws:// or wss://"| T2[Proxy]
        T2 -->|"Encrypted SSH"| T3[SSHd]
        Note1["TLS optional: SSH provides encryption"]
    end
    
    subgraph "PTY Mode"
        P1[Client] -->|"wss:// REQUIRED"| P2[Proxy]
        P2 -->|"SSH (terminated)"| P3[SSHd]
        Note2["TLS required: PTY data is plaintext"]
    end
Loading
Mode Client to Proxy Proxy to Backend Rationale
Tunnel TLS optional Encrypted (SSH) SSH provides end-to-end encryption
PTY TLS required SSH Plaintext terminal data needs protection

Recommendations

  • SHOULD use allowlists for permitted backend hosts/ports
  • SHOULD implement rate limiting on connection attempts
  • SHOULD log authentication failures
  • MAY implement IP-based access controls

Examples

Tunnel Mode: SSH Connection

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant B as Browser (SSH Client)
    participant P as SocketPipe Proxy
    participant S as SSHd (port 22)
    
    B->>P: WebSocket Connect (ws://proxy/tunnel)
    P-->>B: WebSocket Accept
    
    B->>P: HANDSHAKE_REQUEST<br/>(host=server.local, port=22, token=xxx)
    P->>S: TCP Connect
    S-->>P: TCP Accept
    P-->>B: HANDSHAKE_RESPONSE (success)
    
    Note over B,S: SSH handshake (encrypted in DATA payloads)
    B->>P: DATA (SSH_MSG_KEXINIT)
    P->>S: Forward
    S-->>P: SSH_MSG_KEXINIT
    P-->>B: DATA
    
    Note over B,S: SSH session (all encrypted)
    B->>P: DATA (encrypted commands)
    P->>S: Forward
    S-->>P: Encrypted responses
    P-->>B: DATA
Loading

PTY Mode: Terminal Session

%%{init: {'theme': 'base', 'themeVariables': {'primaryTextColor': '#000000', 'secondaryTextColor': '#000000', 'tertiaryTextColor': '#000000', 'noteBkgColor': '#909090', 'noteTextColor': '#000000', 'actorBkg': '#808080', 'actorTextColor': '#000000', 'actorLineColor': '#404040', 'signalColor': '#404040'}}}%%
sequenceDiagram
    participant B as Browser (xterm.js)
    participant P as SocketPipe Proxy
    participant S as SSHd
    
    B->>P: WebSocket Connect (wss://proxy/pty)
    P-->>B: WebSocket Accept
    
    B->>P: HANDSHAKE_REQUEST<br/>(host=server.local, port=22, token=xxx)
    P->>S: SSH Connect (credentials from token)
    S-->>P: SSH Session Ready
    P->>S: Request PTY + Shell
    S-->>P: PTY Allocated
    P-->>B: HANDSHAKE_RESPONSE (success)
    
    B->>P: ENV (TERM=xterm-256color)
    B->>P: RESIZE (cols=80, rows=24)
    P->>S: Set TERM, TIOCSWINSZ
    
    Note over B,S: Terminal session (plaintext over WebSocket)
    B->>P: DATA ("ls -la\r")
    P->>S: Write to PTY
    S-->>P: "drwxr-xr-x  2 user..."
    P-->>B: DATA
    
    Note over B,S: Window resize
    B->>P: RESIZE (cols=120, rows=40)
    P->>S: TIOCSWINSZ + SIGWINCH
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Future Extensions

The following extensions are specified as separate documents:

Extension Status Description
Session Resume Draft Reconnect after network disruption with session ID
Session Persistence Draft Long-lived sessions surviving client disconnect
WebRTC Transport Draft Data channels for lower latency
Multiplexing Draft Multiple logical sessions over single connection
File Transfer Draft SCP/SFTP support
Port Forwarding Draft SSH port forwarding tunnels

References

License

This specification is released under CC BY 4.0.

Contributing

Contributions welcome. Please open an issue or pull request.

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SocketPipe: WebSocket protocol for terminal I/O transport

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