If the API provider would return header with a retry delay time would you be able to add rate limit logic? Try to do it yourself, if you need help leave a comment and lets play in Go’s playground. (The prototype new client library was kicked off in 2018 but never finished for whatever reason.) He wrote, Consider the following typical code you see Go programmers. With the help of code snippets presented in this post, I hope you have grasped the idea of how to customize HTTP client and apply custom, service specific logic. Brad Fitzpatrick, long time maintainer of the net/http package, laid out the problems very well in a file included with his experimental repository for a new HTTP client library. This is an advanced usage that you do not need most of the time. We have learned today how to take advantage of Go’s http.Client and leverage http.RoundTripper to apply custom logic to our customized HTTP client. But hidden underneath are a lot of low level details, including client timeout, server timeout and timeout at the load balancers. When you create an HTTP client, you can specify the following options : Transport (type : http.RoundTripper ): You can custom the way your HTTP requests will be executed by setting this field to a type that implements the type interface http.RoundTripper. This last piece is very important - the docs for Transport state: By default, Transport caches connections for future re-use. Not only that, when it creates the http.Client it also assigns a Transport instance. Service B custom transport sets headers for content type only, because we are using oauth2 HTTP client, they already append token and handle auto-refresh as necessary for us. After some head-scratching we noticed that the code creates a new http.Client for each request. Context, method, path string, payload interface Func ( c * Client ) newRequest ( ctx context.
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