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What is HTTP?
The Hypertext Transfer Protocol (HTTP) is the core of the World Wide Web and provides communication between HTTP clients and servers. HTTP works as a request-response protocol between a client and a server in a format that both HTTP clients and servers can understand. For example, when a user uploads a document to the server, the browser sends an HTTP POST request and includes the document in the body of the POST message. After processing the client's POST request, the server returns a response to the browser and indicates whether the server accepts or rejects the document, with a response status code and message.
What is the HTTP POST request method used for?
The HTTP POST request method is used to send data to the server or create or update a resource. The POST request is usually used when submitting an HTML form or when uploading data to a server. The HTTP POST request may or may not contain data. The data is sent to the server in the body of the POST request message. The Content-Type header indicates the data type in the body of the POST request, and the data length is indicated with the Content-Length HTTP header.
HTTP POST Request Examples
An example of HTTP POST request message for submitting an HTML form to the server.
An example of HTTP POST request message for sending JSON data to the server.
An example of HTTP POST request message for sending XML data to the server.
Some notes on HTTP POST Requests
- POST requests are used to create or update a resource on the server.
- POST messages can contain any type of data of unlimited size.
- POST method is not idempotent, which means that sending the same POST request multiple times can further affect the server's state.