How and where is parameter passing in an HTTP request performed?

Parameters in an HTTP request can be transmitted in several places:

1. URL (Query parameters) — parameters are added to the request string after ? in the format key=value, separated by &. Used for GET requests.

   Example: GET /search?q=java&sort=asc HTTP/1.1

2. Request body — parameters are sent inside the request body, mostly in POST, PUT, PATCH requests. Formats vary: application/x-www-form-urlencoded, multipart/form-data, application/json, etc.

3. Headers — sometimes parameters are sent in headers, e.g., authorization tokens (Authorization), content type (Content-Type), custom headers.

4. Cookies — parameters can be transmitted via cookies, which browsers automatically include in the Cookie header.

The choice of where to send parameters depends on the request type and data transfer goals.