HTTPpyyntö

HTTPpyyntö is the Finnish term for an HTTP request, the message a client sends to a server to ask for a resource or to submit data using the Hypertext Transfer Protocol (HTTP). An HTTP request consists of a request line, header fields, and an optional body. The request line includes the method, the resource path or URL, and the HTTP version.

The most common methods are GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS and TRACE. GET requests retrieve data and should be side-effect free; POST and PUT typically include a message body with data to be processed by the server; others serve specific control or metadata purposes.

Headers convey metadata such as the host, user agent, accepted media types, and content information. The Host header is required for HTTP/1.1. When a body is included, Content-Type describes the media type and Content-Length or Transfer-Encoding indicates its size. Requests can be encrypted when sent over HTTPS, using TLS.

In practice, HTTP requests are issued by web browsers and by any client software via libraries. A typical example is a line like: GET /path/resource?name=value HTTP/1.1 followed by headers such as Host and User-Agent, and optionally a body for methods like POST.

Example:

GET /search?q=cloud HTTP/1.1

Host: example.org

User-Agent: Example/1.0

Accept: text/html

The server responds with an HTTP response containing a status code and optional body. HTTP has evolved through versions (1.0, 1.1, 2, 3) to improve performance and security.