net/http client logging by HAR format.

Take http request/response log by HAR (HTTP Archive) format. It can visualize by any tools.

$ go get github.com/vvakame/go-harlog

har := &harlog.Transport{}
hc := &http.Client{
    Transport: har,
}

// do something...

b, err := json.MarshalIndent(har.HAR(), "", "  ")
if err != nil {
    return err
}
fmt.Println(string(b))

See HAR file in Google Chrome DevTools.

This screenshots are generated by this library. Capture the log about Google Cloud Storage access by cloud.google.com/go/storage.

• compressed response is not supported yet.
• headersSize is not calculated.

patches welcome!