WebSockets

4.

Client-Side WebSocket API (JavaScript)

4.1.

Creating a WebSocket Instance

4.1.1.

Constructor Syntax and Parameters

4.1.2.

Specifying WebSocket URL

4.1.3.

Specifying Subprotocols

4.2.

Connection States

4.2.1.

CONNECTING State

4.2.2.

4.2.3.

4.2.4.

4.2.5.

ReadyState Property

4.3.

WebSocket Events

4.3.1.

4.3.1.1.

Connection Established Handler

4.3.2.

onmessage Event

4.3.2.1.

Receiving Data Handler

4.3.2.2.

Handling Text Messages

4.3.2.3.

Handling Binary Messages

4.3.3.

4.3.3.1.

Error Event Structure

4.3.3.2.

Common Error Scenarios

4.3.4.

4.3.4.1.

Connection Terminated Handler

4.3.4.2.

Close Event Structure

4.3.4.3.

Detecting Close Reasons

4.4.

4.4.1.

The send() Method

4.4.1.1.

Method Syntax and Usage

4.4.2.

Sending Text Data

4.4.2.1.

4.4.2.2.

JSON Serialization

4.4.3.

Sending Binary Data

4.4.3.1.

4.4.3.2.

4.4.3.3.

4.5.

Closing the Connection

4.5.1.

The close() Method

4.5.1.1.

Method Syntax and Parameters

4.5.2.

Status Codes and Reason Strings

4.5.2.1.

Standard Close Codes

4.5.2.2.

Custom Close Reasons

4.6.

Client-Side Best Practices

4.6.1.

Handling Connection Failures

4.6.1.1.

Detecting Connection Failures

4.6.1.2.

Responding to Connection Failures

4.6.2.

Implementing Automatic Reconnection Logic

4.6.2.1.

Reconnection Strategies

4.6.2.2.

Handling Reconnection Delays

4.6.3.

Exponential Backoff Strategy

4.6.3.1.

Algorithm Overview

4.6.3.2.

Implementation Considerations

4.6.4.

Managing Message Queues During Reconnection

4.6.5.

Handling Browser Compatibility

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3. The WebSocket Protocol (RFC 6455)

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5. Server-Side Implementation