Fetch

simple http client with a basic retry / back off strategy

Features

• Default retry / back off strategy 1 seconds, 3 seconds, 5 seconds, 10 seconds
• Provide optional custom retry strategy
• Provide optional HTTP client
• Set default headers for every request
• Add additional headers for individual requests
• Response codes > 399 are treated as errors (fetch.APIError)

Examples

• demo dad jokes

fetch basic example

fetch:=fetch.New()
varapiErr*fetch.APIErrorresp, err:=fetch.Get("https://icanhazdadjoke.com/", nil)
iferr!=nil {
iferrors.As(err, &apiErr) {
// non 2xx,3xx response// StatusCode: 400// StatusText: Bad Request// Message: ""fmt.PrintLn(apiErr)
}
// standard errorsos.Exit(1)
}

fetch with headers

headers:=map[string]string{
"Authorization": "Bearer boo"
}
fetch:=fetch.New()
resp, err:=fetch.Get("https://icanhazdadjoke.com/", headers)
iferr!=nil {
iferrors.As(err, &apiErr) {
// non 2xx,3xx response// StatusCode: 400// StatusText: Bad Request// Message: ""fmt.PrintLn(apiErr)
}
// standard errorsos.Exit(1)
}

fetch with default headers

headers:=map[string]string{
"Authorization": "Bearer boo"
}
options:= fetch.Options{
DefaultHeaders=headers,
}
fetch:=fetch.New(options)
resp, err:=fetch.Get("https://icanhazdadjoke.com/", nil)
iferr!=nil {
iferrors.As(err, &apiErr) {
// non 2xx,3xx response// StatusCode: 400// StatusText: Bad Request// Message: ""fmt.PrintLn(apiErr)
}
// standard errorsos.Exit(1)
}

Cancelable HTTP calls

Use Ctx if you want more granular control and the ability to cancel.

varapiErr*fetch.APIErrorctx, cancel:=context.WithCancel(context.Background())
defercancel()
resp, err:=client.PutCtx(ctx,url, bytes.NewReader([]byte(`{"hello": "world"}`)), nil)
iferr!=nil {
iferrors.is(err, context.Canceled) {
// Handle context cancelled
}
iferrors.As(err, &apiErr) {
fmt.Println("API Response error", apiErr)
}
// Handle non-API Error
}

Using functional options

fetch:=fetch.New(WithOpts(
/** ... more options */WithRetryStrategy(&[]time.Duration{1, 2}),
))

Available options

option	description
WithDefaultRetryStrategy	Use default retry strategy
WithHeaders	Set default headers for every request
WithRetryStrategy	Provide custom retry strategy
WithHTTPClient	Provide custom http client

TODO

feature requests being worked on will be added here