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The server returns JavaScript files or scripts injected into an HTML response, and the browser processes it. In other words, nowadays JavaScript rules the web, including almost everything you interact with on websites.įor our purposes, JavaScript is a client-side language.

Now there are much more interactive web apps with beautiful UIs, which are often built with frameworks such as Angular or React. The last few years have seen the web evolve from simplistic websites built with bare HTML and CSS. What Is a Headless Browser and Why Is It Needed? You should find Puppeteer executes successfully, provided proper Chrome flags are used.In this article, we’ll see how easy it is to perform web scraping (web automation) with the somewhat non-traditional method of using a headless browser. Chrome will write into /tmp instead.Īdd your JavaScript to your container with a COPY instruction.

disable-dev-shm-usage – This flag is necessary to avoid running into issues with Docker’s default low shared memory space of 64MB.

If you’re uncomfortable with this, you’ll need to manually configure working Chrome sandboxing, which is a more involved process. It’s vital you ensure your Docker containers are strongly isolated from your host. Using these flags could allow malicious web content to escape the browser process and compromise the host.

no-sandbox and disable-setuid-sandbox – These disable Chrome’s sandboxing, a step which is required when running as the root user (the default in a Docker container).

Setting this flag explicitly instructs Chrome not to try and use GPU-based rendering.

disable-gpu – The GPU isn’t usually available inside a Docker container, unless you’ve specially configured the host.