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Fiber's high performance relies on pooled contexts to minimize GC overhead. Learn why this 'Zero-Allocation' approach can lead to data corruption in goroutines and how to fix it.
Fiber's default buffer reuse means values from c.Body(), c.Params(), and c.Query() are only valid until the handler returns. Storing them in goroutines or globals can corrupt data. Learn about the Immutable setting and how to copy values safely.
Symptom In a Fiber (Go, fasthttp-based) service, values obtained from Ctx methods such as c.Body() , c.Params() , and c.Query() appear valid inside the handler but produce corrupted or changing data when read later from a goroutine or stored reference. This matches the documented behavior that Fiber reuses fasthttp request buffers after the handler returns.
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