Loading CSS from a URL in Ruby with Net::HTTP

In this guide, we'll show you how to load custom CSS as a URL when converting an HTML document to PDF using PDFShift's API. This allows you to add custom CSS to your page to customize the output of your generated PDF.

It can be interesting to be able to set a custom CSS value to adjust the rendering of your page specifically when exporting the document to PDF. This allows you to keep a standard look and feel to your users, but adjust some areas when sending that same document to PDFShift to get back a PDF.

Moreover, adding a URL can be easier to do than passing the raw CSS content, as it allows you to later modify that CSS without having to modify the query made to PDFShift.

require 'net/http'
require 'uri'
require 'json'

# You can get an API key at https://pdfshift.io
api_key = 'sk_xxxxxxxxxxxx'

params = {
    'source' => 'https://www.example.com',
    'css' => "https://www.example.com/public/style/print.css"
}

url = URI("https://api.pdfshift.io/v3/convert/pdf")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request['Content-Type'] = 'application/json'
request.basic_auth('api', api_key)
request.body = params.to_json

# Send the request and handle the response
response = http.request(request)

# write response to a file nammed "result.pdf"
File.open('result.pdf', 'wb') { |f| f.write(response.body) }

# Print a success message
puts 'The PDF document was generated and saved to result.pdf'

The css parameter accepts either a string or a URL. It will be used as the CSS for the page when converting it to PDF. This allows you to set a custom CSS value to adjust the rendering of your page specifically when exporting the document to PDF.