HTTP Headers

General Headers

  • Cache-Control

    • Directives for caching mechanisms in both requests and responses.

  • Connection

    • Controls whether the network connection stays open after the current transaction finishes.

  • Date

    • Contains the date and time at which the message was originated.

  • Via

    • Added by proxies, both forward and reverse proxies, and can appear in the request headers and the response headers.

Request Headers

  • Accept

    • Informs the server about the types of data that can be sent back.

  • Accept-Language

    • Informs the server about the human language the server is expected to send back. This is a hint and is not necessarily under the full control of the user: the server should always pay attention not to override an explicit user choice (like selecting a language from a dropdown).

  • Authorization

    • Contains the credentials to authenticate a user-agent with a server.

  • Host

    • Specifies the domain name of the server (for virtual hosting), and (optionally) the TCP port number on which the server is listening.

  • Referer

    • The address of the previous web page from which a link to the currently requested page was followed.

  • User-Agent

    • Contains a characteristic string that allows the network protocol peers to identify the application type, operating system, software vendor or software version of the requesting software user agent.

Response Headers

  • Location

    • Indicates the URL to redirect a page to.

  • Server

    • Contains information about the software used by the origin server to handle the request.

Entity Headers

  • Allow

    • Lists the set of HTTP request methods supported by a resource.

  • Content-Length

    • The size of the resource, in decimal number of bytes.

  • Content-Type

    • Indicates the media type of the resource.

Reference

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