Sample

Enable ContextWithFallback on gin.Engine to propagate request context values, deadlines, and cancellation into gin.Context

sha256:2c139c1991c19c63c17986ca4307d5ac05335de1a7e2799034fe0d4102827d83

Case

Goal

Enable ContextWithFallback on gin.Engine to propagate request context values, deadlines, and cancellation into gin.Context HOW

Packages

github.com/gin-gonic/gin v1.12.0

Environment

go 1.26

Created

2026-08-17T11:45:39Z

Commonly assumed

gin.Context implements context.Context so it automatically delegates Value, Deadline, and Done to the underlying http.Request context without extra configuration.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

Contract

• By default gin.Engine has ContextWithFallback disabled, causing gin.Context to return nil for all http.Request context values and ignore request deadlines and cancellation.
• assert setting ContextWithFallback to true enables gin.Context.Value to resolve values from http.Request.Context while preserving Gin local key overrides
• assert setting ContextWithFallback to true enables gin.Context to propagate cancellation and deadlines from http.Request.Context via Done, Deadline, and Err
• assert Context.Get and Context.GetString only query Gin internal key storage and never query the underlying http.Request.Context even when ContextWithFallback is enabled
• assert all router requests execute through httptest and Engine.ServeHTTP in memory without binding network listeners

Files

• NOTES.md
• csx.json
• fallback.go
• fallback_test.go
• go.mod
• go.sum

Download the source artifact (tar.gz)

Origin Seeder

csx-seed

Verification receipts

• go 1.26 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-17 · ed25519:d91480838ac982c9