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Questions and Answers
What does req.url provide when logging an incoming request?
What does req.url provide when logging an incoming request?
Which of the following methods would be used to send response body data in Node.js?
Which of the following methods would be used to send response body data in Node.js?
What purpose does res.setHeader() serve when sending a response?
What purpose does res.setHeader() serve when sending a response?
What will happen if you try to write to the response after calling res.end()?
What will happen if you try to write to the response after calling res.end()?
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Which output can you expect when navigating to http://localhost:3000 after starting the server?
Which output can you expect when navigating to http://localhost:3000 after starting the server?
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In web applications, what does a route represent?
In web applications, what does a route represent?
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Which HTTP method would typically not be used with res.write() when creating a route?
Which HTTP method would typically not be used with res.write() when creating a route?
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What does the req.headers object contain?
What does the req.headers object contain?
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What should the server do when it receives a request to a URL path that is not '/'?
What should the server do when it receives a request to a URL path that is not '/'?
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What is the purpose of routes in a web application?
What is the purpose of routes in a web application?
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How does the server indicate that the response content type is HTML?
How does the server indicate that the response content type is HTML?
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What method should be used to capture the part of the URL after the hostname in a Node.js server?
What method should be used to capture the part of the URL after the hostname in a Node.js server?
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What is the purpose of calling res.end() in the server's response?
What is the purpose of calling res.end() in the server's response?
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Which method is used to handle only POST requests to the /message route?
Which method is used to handle only POST requests to the /message route?
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What does the action attribute of the HTML form indicate?
What does the action attribute of the HTML form indicate?
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What status code is set to indicate a redirect to the user?
What status code is set to indicate a redirect to the user?
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What HTTP method does the HTML form use to send data to the /message route?
What HTTP method does the HTML form use to send data to the /message route?
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What should be checked to execute specific code for the home route?
What should be checked to execute specific code for the home route?
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What Node.js module is necessary for writing data to a file?
What Node.js module is necessary for writing data to a file?
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What does the example suggest should be returned after sending the HTML response in a Node.js server?
What does the example suggest should be returned after sending the HTML response in a Node.js server?
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What command is used to start the server in the terminal?
What command is used to start the server in the terminal?
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What would happen if the URL path does not match '/' in the server code?
What would happen if the URL path does not match '/' in the server code?
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What does the writeFileSync method do in the context of file handling?
What does the writeFileSync method do in the context of file handling?
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What type of content is being sent in response to a request to the root route?
What type of content is being sent in response to a request to the root route?
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What is the purpose of restarting the server after making changes to the code?
What is the purpose of restarting the server after making changes to the code?
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How does Node.js handle incoming data from HTTP requests?
How does Node.js handle incoming data from HTTP requests?
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What is the role of the 'on(data)' event listener in Node.js?
What is the role of the 'on(data)' event listener in Node.js?
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What happens when all data chunks have been received in Node.js?
What happens when all data chunks have been received in Node.js?
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What does the Buffer.concat() method accomplish in Node.js?
What does the Buffer.concat() method accomplish in Node.js?
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Which method is used to initiate the handling of incoming data chunks in Node.js?
Which method is used to initiate the handling of incoming data chunks in Node.js?
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What does the 'body' array represent in the handling of data chunks?
What does the 'body' array represent in the handling of data chunks?
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What is the primary advantage of stream processing in Node.js for large payloads?
What is the primary advantage of stream processing in Node.js for large payloads?
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What is the primary purpose of the requestHandler function in routes.js?
What is the primary purpose of the requestHandler function in routes.js?
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What does the server respond with when a POST request is sent to the '/message' route?
What does the server respond with when a POST request is sent to the '/message' route?
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Which Node.js method is used to read the data chunks sent in a POST request?
Which Node.js method is used to read the data chunks sent in a POST request?
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What should be the content type of the response when handling a request that does not match any specific route?
What should be the content type of the response when handling a request that does not match any specific route?
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Which line of code properly exports the requestHandler function for use in other files?
Which line of code properly exports the requestHandler function for use in other files?
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What does the server.listen(3000) line do in app.js?
What does the server.listen(3000) line do in app.js?
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What will happen if the Buffer.concat(body).toString() method is not correctly used in the POST handling?
What will happen if the Buffer.concat(body).toString() method is not correctly used in the POST handling?
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What message is displayed to the user when accessing the root URL ('/') of the server?
What message is displayed to the user when accessing the root URL ('/') of the server?
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Study Notes
Logging Incoming Requests
- req.url logs the URL path of the incoming request.
- req.method logs the HTTP method of the incoming request.
- req.headers logs an object containing the headers of the incoming request.
Sending Responses
- res.setHeader('Content-Type', 'text/html'): sets the Content-Type header to text/html, informing the browser that the response contains HTML content.
- res.write(): sends chunks of data as part of the response body.
- res.end(): signals to Node.js that the response is complete and can be sent back to the client.
Routing
- Routes are specific endpoints that a web application can respond to.
- Routes represent a specific URL path and HTTP method.
- Routes act as entry points to the application and determine how it responds to client requests to particular endpoints.
Handling Requests
- req.url is used to capture the part of the URL after the hostname.
- If statements are used to check the URL path and determine which route to handle.
Serving HTML Form
- An HTML form is sent to the root route (
/
). - The form uses
POST
method to send data to the '/message' route.
Redirecting Requests
- res.statusCode = 302: sets the status code to 302, indicating a redirect.
- res.setHeader('Location', '/'): sets the Location header to '/', redirecting the user to the root route.
Writing Data to a File
- fs.writeFileSync: creates a new file or overwrites an existing one.
- fs.writeFile: writes data to a file.
Handling Incoming Data with Streams and Buffers
- Streams: Node.js handles incoming data as a stream, processing it in small chunks.
- Buffers: act as temporary holding areas for data chunks and collect them until ready for processing.
- Buffer.concat(): combines all data chunks into a single buffer.
Node Modules System
- require: import a file from another file.
- module.exports: exports a function or variable to be used by other files.
- File Structure: Separate code into multiple files for better organization and maintainability.
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Description
This quiz covers the fundamental concepts of handling incoming requests and sending responses in Node.js. You'll explore how to log request details, set response headers, and implement routing effectively. Test your knowledge on the key components that make up a basic web server using Node.js.