Chaining transports is a pattern originally inspired by this article https://dev.to/stevenacoffman/tripperwares-http-client-middleware-chaining-roundtrippers-3o00. This pattern is similar to middleware pattern which is used to enrich a context of http request coming to your application. There are multiple use-cases where this pattern comes handy such as request logging, caching, authentication and even implementation of retry mechanisms.
Set up HTTP client, which sets User-Agent, Authorization and TraceID headers automatically :
authClient := http.Client{
Transport: transport.Chain(
http.DefaultTransport,
transport.SetHeader("User-Agent", userAgent),
transport.SetHeader("Authorization", authHeader),
transport.TraceID,
),
Timeout: 15 * time.Second,
}Or debug all outgoing requests globally within your application:
if debugMode {
http.DefaultTransport = transport.Chain(
http.DefaultTransport,
transport.LogRequests,
)
}