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Pro and contra of images encoding as base64 encoded data URI for performance purpose

One of the common techniques of the website performance optimization is the reducing of the HTTP requests amount. Each website asset, like image, needs a HTTP request to be loaded. On this issue is based an idea, to embed website images as base64 encoded data URI. After an image is embedded directly into HTML or CSS of the website, no additional HTTP request is needed to load this image - it is no longer an external resource, but becomes a part of the source code. This is the good part.
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