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Overview

The example showcases a web page to PDF conversion server.

The problem

The biggest challenge is that wkhtmltopdf can only run on the main thread, the problem being that the HTTP server runs each request in a separate goroutine.

For more information, see:
• wkhtmltopdf/wkhtmltopdf#1711
• https://forum.dlang.org/thread/[email protected]
• https://forum.qt.io/topic/84485/qapplication-not-created-in-main-thread/9

The solution

The solution is to run the conversion process on the main thread. This can be achieved as shown here. There are also a couple of packages which facilitate this, like faiface/mainthread or olahol/mainthread. The example does not use any external library to access the main thread.

Usage

Run the conversion server.

go run main.go

Make a conversion request.

curl --output OUTPUT.pdf 127.0.0.1:8080?url=PAGE_URL

# Example:
curl --output google.pdf 127.0.0.1:8080?url=https://google.com

The same can be achieved by making a GET request through a web browser.