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This is a simple but powerful messaging pattern which allows two applications to have a two-way conversation with one another over a channel; it is especially common in client–server architectures. [1] Request–response pattern can be implemented synchronously ( such as web service calls over HTTP) or asynchronously. [1]
Used when sending personal or informational email to a business email address. Immediate response not required. RR, meaning Reply Requested or Reply Required. The recipient is informed that they should reply to this email. RSVP, meaning Reply Requested, please, from the French Répondez s'il vous plaît. The recipient is informed that they ...
The client submits an HTTP request message to the server. The server, which provides resources such as HTML files and other content or performs other functions on behalf of the client, returns a response message to the client. The response contains completion status information about the request and may also contain requested content in its ...
The consumer initiates with a message to which the provider responds with status. If the response is a status, the exchange is complete, but if the response is a fault, the consumer must respond with a status. In-Out: This is equivalent to request–response. A standard two-way message exchange where the consumer initiates with a message, the ...
In HTTP version 1.x, header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message.
The client only has to understand the response based on the relevant application protocol, i.e. the content and the formatting of the data for the requested service. Clients and servers exchange messages in a request–response messaging pattern. The client sends a request, and the server returns a response.
As a web development concept, it can be related to a web application's client side (including any web frameworks being used). A server-side web API consists of one or more publicly exposed endpoints to a defined request–response message system, typically expressed in JSON or XML by means of an HTTP-based web server.
An email client, email reader or, more formally, message user agent (MUA) or mail user agent is a computer program used to access and manage a user's email. A web application which provides message management, composition, and reception functions may act as a web email client , and a piece of computer hardware or software whose primary or most ...