title: Wicked PDF header not showing up
body: <p>After already checking the Rails Gem repository for similar issues as well as Stack Overflow, I couldn't find an answer to my problem.</p>
  
  <p>I'm trying to render a pdf using wicked_pdf within a Rails controller, but the header is not showing up, no matter what I do or which recommended solutions to similar issues I follow. </p>
  
  <p>First and foremost, here is the development console output:</p>
  
  <pre><code>***************WICKED***************
    Rendering biddings/show.pdf.html.haml within layouts/pdf
    Rendered biddings/show.pdf.html.haml within layouts/pdf (0.7ms)
    Rendering biddings/header_pdf.html.haml within layouts/pdf_header
    Rendered biddings/header_pdf.html.haml within layouts/pdf_header (1.9ms)
  "***************[\"/home/tommy/.rvm/gems/ruby-
   2.5.1@igalbids/bin/wkhtmltopdf\", \"-q\", \"--encoding\", \"UTF-8\",
    \"--javascript-delay\", \"500\", 
    \"--disable-internal-links\", \"--disable-external-links\", 
    \"--orientation\", \"Portrait\", \"--margin-top\", 
    \"50\", \"--margin-bottom\", \"25\", \"--header-html\", 
    \"file:////tmp/wicked_header_pdf20180801-27285-b8y5sg.html\", 
    \"--footer-right\", \"Página [page] de [topage]\",
    \"file:////tmp/wicked_pdf20180801-27285-1jfgdd7.html\", 
    \"/tmp/wicked_pdf_generated_file20180801-27285-1bkrvhx.pdf\"]***************"
    Rendering text template
    Rendered text template (0.1ms)
  Sent data Licitación_2524.pdf (0.6ms)
  Completed 200 OK in 2334ms (Views: 0.5ms | ActiveRecord: 64.4ms)
  </code></pre>
  
  <p>As you can see, both the header layout and its contents are being rendered and processed, however they don't make the final output PDF, and I don't know why! Look:</p>
  
  <p><a href="https://i.stack.imgur.com/apiZP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/apiZP.png" alt="PDF Output"></a></p>
  
  <p>So, here's my controller code:</p>
  
  <pre><code>class Api::V1::Biddings::PdfBiddingsController &lt; PdfController
    # JWT Authentication enforced
    before_action :authenticate_user!
  
    # GET /biddings/:id/pdf
    def show
      @bidding = scoped_collection.find(params[:id])
  
      authorize [:biddings, :pdf, @bidding]
      respond_to do |format|
        format.pdf do
          render(
            pdf: "#{Bidding.model_name.human}_#{@bidding.code}",
            disposition: "inline",
            orientation: "Portrait",
            template: 'biddings/show.pdf.html.haml',
            header: {
              html: {
                template: "biddings/header_pdf.html.haml",
                handlers: [:haml],
                layout: "pdf_header",
                formats: [:haml, :html]
              }
            },
            footer: {
              html: {
                handlers: [:haml],
                layout: "pdf",
                formats: [:haml, :html],
                encoding: 'UTF-8'
              },
              right: "#{I18n.t('pdf.page')} [page] #{I18n.t('pdf.of')} [topage]"
            },
            margin: { :top =&gt; 50, :bottom =&gt; 25},
            handlers: [:haml],
            layout: "pdf",
            javascript_delay: 500,
            encoding: 'UTF-8',
            show_as_html: false,
            disable_internal_links: true,
            disable_external_links: true) and return
        end
      end
    end
  
    protected
    def self.model
      Bidding
    end
  
    private
    def scoped_collection
      policy_scope([:biddings, :pdf, Bidding]).includes(:bidding_type, :client, :payment_condition, :price_list, :real_payment_condition, :sales_man, :user)
    end
  
    def records_per_page
      params[:per_page] || 10
    end
  end
  </code></pre>
  
  <p>Nothing fancy, there you can see all the config options, pretty standard. Needless to say, the footer with the page numbering IS working fine (screenshot too long to show, but trust me). Can't say the same about the header.</p>
  
  <p>Here's the PDF header layout file:</p>
  
  <p><em>pdf_header.html.haml</em>:</p>
  
  <pre><code>!!! 5
  %html
    %head
      %meta{:content =&gt; "text/html; charset=utf-8", "http-equiv" =&gt; "content-type"}/
      = wicked_pdf_stylesheet_link_tag "bidding_pdf", media: :all
      = csrf_meta_tags
    %body.pdf
      = yield
  </code></pre>
  
  <p>and here the contents for the header "contents" <em>per se</em>:</p>
  
  <p><em>header_pdf.html.haml</em>:</p>
  
  <pre><code>Test text
  </code></pre>
  
  <p>Just plain text. I have a Linux 16.04 x64 OS, wicked_pdf (1.1.0), wkhtmltopdf-binary (0.12.4). How can I debug this?</p>