I'm just starting to learn about express and HTTP. I've heard that the express library has app.get, app.post, and res.send methods. From what I gather, app.get is used for GET requests and app.post is used for POST requests. How does res.send fit into all of this? Does it specifically call a POST request?
res.send() is a function that sends a response to an incoming HTTP request made to your server.
app.post() is used to register a request handler with Express for a specific URL in your server, specifically for POST requests. This means that when your Express server receives a POST request at that URL, it will execute the specified request handler.
For example, here's how res.send() can be used:
// Setting up a request handler for a GET request to /
app.get("/", (req, res) => {
res.send("hi"); // Sending a response to the incoming request
});
And this is an example of using app.post():
// Middleware to read and parse body for content-type application/x-www-form-urlencoded
app.use(express.urlencoded({extended: true}));
// Configuring a request handler for a POST request to /login
app.post("/login", (req, res) => {
if (req.body.username === "John" && req.body.password === "foobar99") {
res.send("Login successful");
} else {
res.status(401).send("Login failed");
}
});
There seems to be some confusion about res.get and res.send. It's important to note that there is no
res.get. Perhaps you were referring toapp.get()? This method configures a request handler for an HTTP GET request to a specific URL.
As another point of clarification, res.send() does not trigger a POST request.
The process of handling an HTTP request involves several steps:
An HTTP client makes a request by sending it to a server.
This request includes an HTTP verb (GET, POST, etc.) and a URL.
The server, like an Express server, checks its registered routes to find a matching one based on the request. If found, the corresponding route handler is called with arguments (req, res, next).
The handler code can then access information from the request and use the res object to send a response, setting headers, status codes, etc. res.send() is just one way to do this; other options include res.sendFile(), res.json(), and more.
Once the response is sent back, the HTTP request/response cycle is complete.
Those two components are entirely distinct.
The Express Router is designed to handle various HTTP methods such as .get(), .post(), and .put().
Within the middleware and handlers, one of the parameters passed along is the Response object, which includes a .send() function for returning responses back to the client side. This Response entity can also be extended to transmit JSON data among other things.
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