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Retryable HTTP client in Go

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go-retryablehttp

Name: go-retryablehttp
Brand: go-retryablehttp
SKU: //hashicorp/go-retryablehttp
Rating: 1.2244 (561 reviews)

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 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 godoc.