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We created a custom implementation of an io.ReadCloser that allowed us to wrap the http.Handler's io.ReadCloser and attach context to the request: https://github.com/bradrydzewski/routes/blob/master/exp/cont...

It avoids the global lock and we haven't found any compatibility issues.

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This is pretty neat. Functions that read from or write to http.Request.Body should be able to accept a Context object, assuming they take a Reader/Writer. If they take an http.Request, you're going to pass in Context.req, similar to how custom.Request would contain a custom.req field.

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