(Ruby) Get Size of File on Web Server

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

http = Chilkat::CkHttp.new()

# resp is a CkHttpResponse
resp = http.GetHead("https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip")
if (http.get_LastMethodSuccess() == false)
    print http.lastErrorText() + "\n";
    exit
end

# Examine the response header.
print resp.header() + "\n";

# Here is a sample response header:

# Date: Thu, 01 Aug 2019 12:47:27 GMT
# Content-Type: application/zip
# Content-Length: 17457922
# Connection: keep-alive
# Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
# Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
# ETag: "5d41dc45-10a6302"
# Accept-Ranges: bytes
# Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
# Server: cloudflare
# CF-RAY: 4ff7ebb32ac4e1e2-ORD

# Get the Content-Length header.
contentLengthStr = resp.getHeaderField("Content-Length")
# If the header exists...
if (resp.get_LastMethodSuccess() == true)
    print "Content-Length: " + contentLengthStr + "\n";
    # Your application can convert the contentLengthStr to an integer and then use it....
end