hashicorp/go-retryablehttp

# go-retryablehttp [][travis] [][godocs] The `retryablehttp` package provides a familiar HTTP client interface with automatic retries and exponential backoff. It is a thin wrapper over the standard `net/http` client library and exposes nearly the same public API. This makes `retryablehttp` very easy to drop into existing programs. `retryablehttp` performs automatic retries under certain conditions. Mainly, if an error is returned by the client (connection errors, etc.), or if a 500-range response code is received (except 501), then a retry is invoked after a wait period. Otherwise, the response is returned and left to the caller to interpret. The main difference from `net/http` is that requests which take a request body (POST/PUT et. al) can have the body provided in a number of ways (some more or less efficient) that allow "rewinding" the request body if the initial request fails so that the full request can be attempted again. See the [godoc](http://godoc.org/github.com/hashicorp/go-retryablehttp) for more details. Version 0.6.0 and before are compatible with Go prior to 1.12. From 0.6.1 onward, Go 1.12+ is required. From 0.6.7 onward, Go 1.13+ is required. # Example Use Using this library should look almost identical to what you would do with `net/http`. The most simple example of a GET request is shown below: resp, err := retryablehttp.Get("/foo") if err != nil { panic(err) } The returned response object is an `*http.Response`, the same thing you would usually get from `net/http`. Had the request failed one or more times, the above call would block and retry with exponential backoff. ## Getting a stdlib `*http.Client` with retries It's possible to convert a `*retryablehttp.Client` directly to a `*http.Client`. This makes use of retryablehttp broadly applicable with minimal effort. Simply configure a `*retryablehttp.Client` as you wish, and then call `StandardClient()`: retryClient := retryablehttp.NewClient() retryClient.RetryMax = 10 standardClient := retryClient.StandardClient() // *http.Client For more usage and examples see the [pkg.go.dev](https://pkg.go.dev/github.com/hashicorp/go-retryablehttp).

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