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This is a list of image URLs, specifically designed for responsive images. Let’s break down what’s happening here:
* /_next/image/?url=...: This indicates the image is being served through Next.js’s built-in image optimization system. Next.js automatically handles resizing, optimization, and serving images in modern formats (like WebP) for better performance.
* https%3A%2F%2Fs3-eu-west-1.amazonaws.com%2Fprod-media-racingpost%2Fprod%2Fimages%2F169_1008%2Fd93ba704103c-96672-max.jpg: This is the original URL of the image, hosted on an Amazon S3 bucket (s3-eu-west-1.amazonaws.com) belonging to “racingpost”. The %3A and %2F are URL-encoded characters for : and / respectively.
* &w=...: This parameter specifies the width of the image in pixels.You see widths ranging from 32px to 3840px.
* &q=75: This parameter sets the image quality to 75%. Lower values mean smaller file sizes but possibly more compression artifacts.
What this list represents:
This is a set of different versions of the same image, each resized to a specific width. A web browser (or Next.js itself) will use this list to choose the most appropriate image size based on the user’s screen size and device pixel ratio. This is a key technique for improving website performance and user experience, especially on mobile devices. It’s called responsive images.
In essence, the browser will:
- Determine the screen width and pixel density.
- Select the image URL from the list that best matches the screen’s requirements (e.g., if the screen is 600px wide, it might choose the 640w image).
- Download and display that specific image size.
This avoids sending large, high-resolution images to small screens, saving bandwidth and improving loading times.