How do 'request' and 'Response' events work on Node.js?

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Everybody knows how to use the request and response properly as callback parameters of the http.createServer, and that we use these two parameters as objects inside the callback.

I searched the DOC’s API and there it says that both are object instances http.IncomingMensage and which, in turn, is created by http.Server(request) and http.ClientRequest(sponse)...

I was confused because in the DOC they refer to http.Server as an event broadcaster and the http.ClientRequest as an object builder. I tried to understand native code in Node’s lib and there I found them all in their places but still didn’t understand.

The question is: what happens behind a standard server build using the request and response? What exactly are?

Obs, I know how to build eventListeners and Emitters using the http.events simply.

Source code: http.Clientrequest, http. Server, http.Incomingmensage, http.createServer

javascript node.js event-handler

  • As far as I know they are simple objects that you use to manipulate the request and the answer. They are not events. I don’t think I understand your question...

  • http://nodejs.org/api/http.html#http_class_http_server, here for example refers to request as an event that is instance of Incomingmensage @bfavaretto

  • I think I understand your confusion, I’ll answer.

  • Managed to Resolve That Question?

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I think the way the documentation of the Node was written is confusing you. She says yes there is an event called request, and then shows the following:

function (request, response) { }

That part is the signature of Listener event. That is, when you create a server with http.createServer([requestListener]), the requestListener that you must pass is a function with that signature, a function that takes as a first argument an object request (of the kind http.IncomingMessage) and an object response (of the kind http.ServerResponse).

In other words, what the http.createServer([requestListener]) makes associating an Event Listener to the "request" event. Every time a request is made, the server emits this event, and the Reader will be invoked with the given arguments.

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