Send request and print response using node.js

nerf.js

var util = require('util');
var fs   = require('fs');
var http = require('http');

// Check for an input file
if (2 >= process.argv.length) {
    console.error('An input file must be specified');
    process.exit(1);
}

// Pop the file of the script arguments (assume its the last argument)
var file = process.argv.pop();

// Try to read the input file
try {
    var content = fs.readFileSync(file, 'utf-8');
} catch (error) {
    console.error('Could not read file "' + file + '". Error: ' + error);
    process.exit(1);
}

// Split header and body
var parts = content.split(/\r?\n\r?\n/, 2);
var headerPart = parts.shift().trim();
var bodyPart = parts.length > 0 ? parts.shift().trim() : '';

// Process the headers
var headerLines = headerPart.split(/\r?\n/);
var requestLine = headerLines.shift();
var hostLine    = '';
var headers = {};
for (var i = 0; i < headerLines.length; i++) {
    var line = headerLines[i];
    var headerParts = line.split(':', 2);
    var headerKey = headerParts.shift().trim();
    var headerValue = headerParts.shift().trim();

    // Special case for Host header, we need this seperately for node's
    // request method. This could be circumvent by using the ClientRequest object directly
    if ('host' === headerKey.toLowerCase()) {
        hostLine = headerValue;
        continue;
    }
    // Save the header
    headers[headerKey] = headerValue;
}

// Build the request options
var options = {
    headers: headers
};

// Process the request line to retreive the method and path
var requestLineParts = requestLine.split(' ');
options.method = requestLineParts.shift().trim().toUpperCase();
options.path = requestLineParts.shift().trim();

// Process the host and port from the hostLine
var hostParts = hostLine.split(':', 2);
options.host = hostParts.shift().trim();
options.port = hostParts.length > 0 ? hostParts.shift().trim() : 80;

// Make the actual request
var request = http.request(options, function(response) {
    var body = '';

    // Write the status line
    util.puts('HTTP/' + response.httpVersion + ' ' + response.statusCode + ' ' + http.STATUS_CODES[response.statusCode]);

    // Make sure we can handle chunked transfer
    response.on('data', function(chunk) {
        body += chunk;
    });

    // Once done present the result
    response.on('end', function() {
        // Print the response headers
        for (header in response.headers) {
            var value = response.headers[header];
            util.puts(header + ': ' + value);
        }
        util.puts('');
        // Print the body
        util.puts(body);
    });
});

// Handle errors
request.on('error', function(error) {
    console.error('Error making request: ' + error);
    process.exit(2);
});


// Send the request with body
request.write(bodyPart);
request.end();