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Respect Save-Data client hint in gatsby-image #17202

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KyleAMathews opened this issue Aug 29, 2019 · 2 comments · May be fixed by #17253

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@KyleAMathews
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commented Aug 29, 2019

Many people on constrained data plans turn on data saving — their smartphone browsers then send a "Save-Data" header to servers.

We can use this in the client as well to choose lower-data rendering options for these people.

For gatsby-image, we can render regular resolution images for these people instead of retina.

if ("connection" in navigator) {
    if (navigator.connection.saveData === true) {
        // Implement data saving operations here.
    }
}

We can detect in the component if data saving is enabled and then when rendering, only render the src and not srcset thus avoiding making the user download retina (so much bigger) images.

The source code for gatsby-image is at https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-image/src/index.js

We can use a similar pattern for this as we do with detecting native lazy loading support

const hasNativeLazyLoadSupport =

For background reading on Save-Data:

@charlyx

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commented Aug 29, 2019

Hi Kyle,

I’d like to work on this if that’s ok :)

@KyleAMathews

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commented Aug 29, 2019

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