Question Headers. What are they?

[finelli]

hi
can someone explain the use of headers? why they are used and when to use them?
Thanks

 

[redhat]

hi
can someone explain the use of headers? why they are used and when to use them?
Thanks

What are Headers?

Headers are key-value pairs of metadata sent at the start of a network communication (e.g., HTTP request/response, email, etc.). They give additional context about the content being transferred, the client or server behavior, or how the data should be processed.

In HTTP (Web Requests)

Header​	Purpose​
Content-Type	Tells the server what kind of data is being sent (application/json, text/html, etc.)
Authorization	Used for login credentials (e.g., Bearer token)
User-Agent	Identifies the client (e.g., browser or app)
Accept	What formats the client can accept
Cache-Control	Directs how caching should be handled
Set-Cookie	Sends cookies from the server to the client
Host	Specifies the domain being requested

When to Use HTTP Headers:

• Sending requests to an API: You set headers like Authorization, Content-Type, etc.
• Handling sessions and authentication: Cookies or tokens are passed in headers.
• Custom behavior: You can define your own custom headers (e.g., X-Custom-Header).

Purpose of HTTP Headers:

• Define content type, encoding, and length
• Control caching and security policies
• Send authentication credentials
• Indicate language or session information