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package main
import (
"fmt"
"io"
"net/http"
"net/url"
)
// fetch makes a GET request to refURL, returning the HTML contents of
// that webpage. An error is also returned.
//
// A [url.URL] type is used for refURL to simplify recursive or else
// repeated use of this function when crawling webpages to, say, build
// a sitemap.
func fetch(refURL url.URL) ([]byte, error) {
rawURL := refURL.String()
// For now we leave the client unconfigured.
client := http.Client{}
req, err := http.NewRequest(http.MethodGet, rawURL, nil)
if err != nil {
return nil, fmt.Errorf("can't create request: %w", err)
}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("client failed: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("status for %s for %s: %s", http.MethodGet, rawURL, resp.Status)
}
htmlBytes, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("can't read reponse body into byte buffer")
}
return htmlBytes, nil
}
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