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HTTP headers | Early-Data

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  • Last Updated : 27 Oct, 2022
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The Early-Data header is a kind of HTTP header that permits clients to send requests immediately. This ensures that there are no one or two round-trip delays that are required by Transport Layer Security (TLS) handshake to get executed. When this header is set, it indicates that the request has been communicated in TLS early data by the intermediate agent. It also indicates that the intermediate agent has understood the 425(Too Early) status code. Syntax:

Early-Data: 1

Note: Here Early-Data has been set(1). Directives: This header does not accept any directive. Examples:

GET /resource HTTP/1.0
Host: www.geeksforgeeks.org
Early-Data: 1

Supported Browsers: The browsers are supported by HTTP Early-Data header are listed below:

  • Firefox
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