11. HTTP FILE SERVER

HTTP FILE SERVER (Exercise 11 of 13)

Write an HTTP server that serves the same text file for each request it
receives.

Your server should listen on the port provided by the first argument to
your program.

You will be provided with the location of the file to serve as the second
command-line argument. You must use the fs.createReadStream() method to
stream the file contents to the response.

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HINTS

Because we need to create an HTTP server for this exercise rather than a
generic TCP server, we should use the http module from Node core. Like the
net module, http also has a method named http.createServer() but this one
creates a server that can talk HTTP.

http.createServer() takes a callback that is called once for each
connection received by your server. The callback function has the
signature:

 function callback (request, response) { /* ... */ }  

Where the two arguments are objects representing the HTTP request and the
corresponding response for this request. request is used to fetch
properties, such as the header and query-string from the request while
response is for sending data to the client, both headers and body.

Both request and response are also Node streams! Which means that you can
use the streaming abstractions to send and receive data if they suit your
use-case.

http.createServer() also returns an instance of your server. You must call
server.listen(portNumber) to start listening on a particular port.

A typical Node HTTP server looks like this:

 var http = require('http')  
 var server = http.createServer(function (req, res) {  
   // request handling logic...  
 })  
 server.listen(8000)  

Documentation on the http module can be found by pointing your browser
here:
file:///home/ubuntu/.nvm/versions/node/v6.11.2/lib/node_modules/learnyouno
de/node_apidoc/http.html

The fs core module also has some streaming APIs for files. You will need
to use the fs.createReadStream() method to create a stream representing
the file you are given as a command-line argument. The method returns a
stream object which you can use src.pipe(dst) to pipe the data from the
src stream to the dst stream. In this way you can connect a filesystem
stream with an HTTP response stream.

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HTTP FILE SERVER (Exercise 11 of 13)

//////////////////////////////////////////////
/*  function exercise 11  FILE SERVER       */
//////////////////////////////////////////////


function httpFile(){
    
    var http = require('http'); // load networking module
    var port = process.argv[2]; // get the port number from args
    var fPath = process.argv[3]; // read file path from args 
    var fs = require('fs'); // load file system module
    
    var server = http.createServer(function (req, res) {  
        // socket handling logic 
        
        var content = fs.createReadStream(fPath); // read incoming file stream
        content.pipe(res); // write out

    });  
    
    server.listen(port);     
   
}

    httpFile();

Your submission results compared to the expected:

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1. ACTUAL: "Mad as a freckle my gutful of bathers. She'll be right tucker also as cunning as a outback."

2. EXPECTED: "Mad as a freckle my gutful of bathers. She'll be right tucker also as cunning as a outback."

3. ACTUAL: ""

4. EXPECTED: ""

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✓

Submission results match expected

PASS Your solution to HTTP FILE SERVER passed!

Here's the official solution in case you want to compare notes:

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    var http = require('http')
    var fs = require('fs')
    
    var server = http.createServer(function (req, res) {
      res.writeHead(200, { 'content-type': 'text/plain' })
    
      fs.createReadStream(process.argv[3]).pipe(res)
    })
    
    server.listen(Number(process.argv[2]))

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