ElementumOrg/cfbypass

Small library for bypassing CloudFlare challenges.

Give it a proxy request result, it will check if passing of challenge is needed, pass it and re-submit the request with included CloudFlare cookies.

Example of usage:

Proxy = goproxy.NewProxyHttpServer()
Proxy.OnResponse().DoFunc(handleResponse)

... 

func handleResponse(resp *http.Response, ctx *goproxy.ProxyCtx) *http.Response {
    defer ctx.Req.Body.Close()

    if resp == nil {
        return resp
    }

    if cfResp, err := cfbypass.RunProxy(resp, ctx); err != nil {
        log.Warningf("Could not solve the CloudFlare challenge: %s", err)
    } else if cfResp != nil {
        return cfResp
    }

    return resp
}

Or with HttpClient:

httpClient = &http.Client{}

buffer := new(bytes.Buffer)
req, err := http.NewRequest("GET", "https://test.com/", buffer)
if err != nil {
	return err
}

// Set custom headers
req.Header.Add("User-Agent", `Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.27 Safari/537.36`)

resp, err := httpClient.Do(req)
if err != nil {
	return err
}

if IsCloudFlared(resp) {
	if resp, err = RunClient(resp, httpClient); err != nil {
        return err
    }
}

// Here you should already have response, 
// after solving CloudFlare and re-requesting from destination website.