Add body cache middleware to restore request body after Bind()#4
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Add body cache middleware to restore request body after Bind()#4elevasyncsolutions-jpg wants to merge 1 commit into
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When echo's c.Bind() consumes the request body, subsequent reads from c.Request().Body return empty. This middleware reads the body before binding and caches it, making it available via GetCachedBody() after Bind() has been called. Key components: - BodyCacheMiddleware: echo middleware that reads and caches body - WrapBody: helper to make request.Body re-readable - GetCachedBody: retrieves the cached body bytes - Example usage demonstrating body preservation after Bind()
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Problem
When using
c.Bind(), echo consumes the request body stream. After binding,c.Request().Bodyreturns an empty stream, making it impossible to read the raw body for logging, validation signatures, or replay.Solution
Added a
BodyCacheMiddlewarethat reads the request body into a buffer before any handler runs, then replacesc.Request().Bodywith a reusableio.NopCloser. The cached body is stored in the echo context under the"cachedBody"key and can be retrieved viaGetCachedBody(c).Components
BodyCacheMiddleware: Drop-in echo middleware. Usage:e.Use(BodyCacheMiddleware)GetCachedBody(c echo.Context) ([]byte, bool): Retrieves cached body after Bind()main.godemonstrates body preserved after binding JSON to structTesting
Manual test via
go run main.go: binds JSON body to User struct, then reads cached raw body from context. Both are available.