ETag - Fiber

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ETag
ETag middleware for Fiber that lets caches be more efficient and save bandwidth, as a web server does not need to resend a full response if the content has not changed.
Table of Contents
​Signatures​
​Examples​
​Default Config​
​Custom Config​
​Config​
​Default Config​
Signatures
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func New(config ...Config) fiber.Handler
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Examples
Import the middleware package that is part of the Fiber web framework
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import (
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  "github.com/gofiber/fiber/v2"
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  "github.com/gofiber/fiber/v2/middleware/etag"
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)
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After you initiate your Fiber app, you can use the following possibilities:
Default Config
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app.Use(etag.New())
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​
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// Get / receives Etag: "13-1831710635" in response header
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app.Get("/", func(c *fiber.Ctx) error {
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	return c.SendString("Hello, World!")
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})
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Custom Config
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app.Use(etag.New(etag.Config{
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    Weak: true,
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}))
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​
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// Get / receives Etag: "W/"13-1831710635" in response header
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app.Get("/", func(c *fiber.Ctx) error {
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	return c.SendString("Hello, World!")
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})
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Config
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// Config defines the config for middleware.
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type Config struct {
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    // Next defines a function to skip this middleware when returned true.
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    //
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    // Optional. Default: nil
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    Next func(c *fiber.Ctx) bool
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​
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    // Weak indicates that a weak validator is used. Weak etags are easy
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    // to generate, but are far less useful for comparisons. Strong
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    // validators are ideal for comparisons but can be very difficult
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    // to generate efficiently. Weak ETag values of two representations
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    // of the same resources might be semantically equivalent, but not
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    // byte-for-byte identical. This means weak etags prevent caching
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    // when byte range requests are used, but strong etags mean range
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    // requests can still be cached.
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    Weak bool
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}
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Default Config
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var ConfigDefault = Config{
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    Next: nil,
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    Weak: false,
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}
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