Every page you open begins with a question and an answer. Follow one request as the browser sends it, the server builds a reply, and the response becomes the page on your screen.
HTTP — HyperText Transfer Protocol — is the language browsers and web servers use to trade documents. It follows one simple pattern: the client asks for something, and the server answers. That exchange is called the request-response cycle.
A single page often needs many of these exchanges. The first request fetches the HTML, and further requests pull in the images, stylesheets and scripts that page refers to.
Because the two sides can then be simple and independent. The client only has to say what it wants; the server only has to describe what it is sending back. Either side can be replaced, upgraded or run anywhere as long as both follow the same rules.
That separation is why the same browser can talk to millions of different servers, and the same server can answer millions of different browsers.
Everything starts in the browser. It builds an HTTP request describing what it wants and sends it toward the server that hosts the site.
The request travels over the network as data, carrying a method such as GET, the URL path it wants, and headers that add context like the browser type and preferred formats.
When the request arrives, the web server reads it and works out which piece of the site should answer, then routes it to the right place.
The handler does the real work: reading a file, querying a database, or running code. The outcome is assembled into an HTTP response.
The response contains a status code that summarises the outcome, headers describing the content, and a body holding the actual page, image or data. It travels back to the client.
On arrival, the browser interprets the response and draws the result on screen. If the page references more resources, the cycle simply repeats for each of them.
HTTP is the set of rules a client and a server follow to exchange documents: the client sends a request describing what it wants, and the server sends back a response containing it.
A request names the action (the method, such as GET), the resource it wants (the URL path), and extra details in headers, such as the browser version or accepted formats.
A response carries a status code that says how the request went, headers with details about the content, and a body holding the actual page, image or data.
The status code summarises the outcome. 200 means success, 404 means the resource was not found, and 500 means the server ran into an error while trying to answer.
No. HTTP is request-response: the client asks and the server answers, then the exchange is done. A single page may need many such exchanges for its images, styles and scripts.
By itself HTTP is stateless — each request stands alone. Websites add state on top with cookies, tokens or sessions so the server can recognise you across requests.