Awesome

delay

Middleware for adding delays (latency) to your endpoint. Intended to simulate latency for testing its effects on faster networks.

Add a delay of a specified duration by adding an http header to your request.

The header name is X-Add-Delay. The value can be any value parsable by golang's time.ParseDuration. For example, 300ms, 2.5s, and 0.5m are all valid values. Technically -1.5s is a valid value, but it won't actually speed up your end point :p

If the value is not parsable it will not add any latency. It will behave as if the header wasn't there at all.

Header Examples

X-Add-Delay: 300ms

X-Add-Delay: 2.5s

How to use it with negroni

There is no configuration.

Just slip it in as negroni middleware:

import (
    "github.com/codegangsta/negroni"
    "github.com/jeffbmartinez/delay"
)

n := negroni.New(...)
n.Use(delay.Middleware{})
// ...