HTTP Headers

In this lesson, we will learn about the HTTP header and its types.

What are HTTP headers?

The client and the server can pass some additional information using HTTP headers through a request or a response.

An HTTP header is basically a key-value, where its key is a case-insensitive string and value is a single or array of string.

Types of HTTP headers

These are grouped into different categories below, based on their context:

  • General headers: this is used for both request and response and there is no relation to the message data.

  • Request headers: these are client headers, sent during the HTTP request and they contain information about the resource to be fetched.

  • Response headers: these are server headers and are part of the HTTP response. They give more details about the server resource context.

  • Entity headers: these headers give meta-information about the content of the body of the message like MIME type, Content-length, etc.

To learn more about various HTTP headers options, please go here.

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