Sec-WebSocket-Accept HTTP Header: Syntax, Directive, Examples

The Sec-Websocket-Accept HTTP headers are used to send additional information between the client and the server with an HTTP request or response. They are subdivided into general headers, request headers, response headers, and entity headers. The Sec-WebSocket-Accept HTTP Header is part of the response-type headers group. It is used by the server to let the client know that it understands what the server said. A WebSocket connection was established and is now ready to be used. A reverse-proxy server will like this because it will be able to decipher the WebSocket handshake and avoid creating a pointless cache. The Sec-WebSocket-Accept HTTP Header must not exist in an HTTP response more than once. There is only one value for the Sec-WebSocket-Accept HTTP Header. The <harshed keys> are unlikely to be used by network endpoints that do not understand the WebSocket Protocol. The Sec-WebSocket-Accept HTTP Header example is written below. 

101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: MTMyNThFQUZBNS1FOTE0LTQ3REEtOTVDQS1DNUFCMERDODVCMTE=
Sec-WebSocket-Extensions: deflate-frame
Sec-WebSocket-Protocol: soap

In this article, the Sec-WebSocket HTTP Header Syntax, Directives, and Uses with examples will be processed.

What is Sec-WebSocket-Accept HTTP Header?

Sec-WebSocket-Accept is a response-type header. It is utilized by the server to communicate to the client that it has comprehended. It was a WebSocket connection, and the connection is now ready to be opened. This is advantageous for a reverse-proxy server since it enables it to comprehend the WebSocket handshake and avoid creating an unnecessary cache. The Sec-WebSocket-Accept header must not exist in an HTTP response more than once.

What is the Syntax of Sec-WebSocket-Accept HTTP Header?

The Sec-WebSocket-Accept HTTP Header has only one value. The syntax using the Sec-Websocket-Accept HTTP Header is given below.

Sec-WebSocket-Accept: <hashed key>

What is the Directive of Sec-WebSocket-Accept HTTP Header?

There is only one value for the directives of the Sec-WebSocket-Accept HTTP Header. The directives of the Sec-WebSocket-HTTP Header is the <hashed key>. This server takes the value of the Sec-WebSocket-Key that was sent in the handshake request, appends “258EAFA5-E914-47DA-95CA-C5AB0DC85B11” takes the SHA-1 of the new value, and then encodes it in base64 format for transmission. The example directives for using Sec-WebSocket-Accept HTTP Header are given below. 

Sec-WebSocket-Accept: s3pNLMBoTxaQ4tYGzzhTYbK+xOo=

How to use Sec-WebSocket-Accept HTTP Header?

The Sec-WebSocket-Accept header is used in the WebSocket opening handshake to indicate acceptance of the WebSocket. It would show up in the response headers as a result. In other words, this header is sent from the server to the client to alert the client that the server is willing to begin a WebSocket connection with the client.

Examples of Sec-WebSocket-Accept HTTP Header Use

An example of the Sec-WebSocket-Accept HTTP Header use is given below.

101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: MTMyNThFQUZBNS1FOTE0LTQ3REEtOTVDQS1DNUFCMERDODVCMTE=
Sec-WebSocket-Extensions: deflate-frame
Sec-WebSocket-Protocol: soap

What is the Specification Document for Sec-WebSocket-Accept HTTP Header?

There is only one specification document for the Sec-WebSocket-Accept HTTP Header which is the RFC 6455. RFC 6455 describes the Sec-WebSocket-Accept HTTP Header as the header field that is used in the WebSocket handshake. Additionally, this article discusses the Server HTTP Header’s definition and usage.

What is the type of Sec-WebSocket-Accept HTTP Header?

The Sec-WebSocket-Accept HTTP Header is a Response Header type because it is delivered from the server to the client to alert them that the server is ready to begin a WebSocket connection. The other types of HTTP Headers from the Sec-WebSocket HTTP Header can be found below. 

What is the similar HTTP Header to the Sec-WebSocket-Accept HTTP Header?

There is only one similar HTTP Header for the Sec-WebSocket-Accept HTTP Header which is the Sec-WebSocket-Key HTTP Header. The Sec-WebSocket-Key HTTP Header is used in the handshake that opens a WebSocket. When a WebSocket opens, the client sends a header to show that it has done so correctly. This header is called Sec-WebSocket-Accept HTTP Header, and it is sent from the client to the server to show that it has done so.

Which Browsers Support Sec-WebSocket-Accept HTTP Header? 

There is no compatibility of browser for the Sec-WebSocket-Accept HTTP Header

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