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prober: log HTTP response body on failure

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Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov 2023-12-12 19:14:25 +00:00 committed by Anton Tolchanov
parent affe11c503
commit 869b34ddeb
1 changed files with 6 additions and 1 deletions
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7
prober/http.go
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@ -53,7 +53,12 @@ func probeHTTP(ctx context.Context, url string, want []byte) error {
}
if !bytes.Contains(bs, want) {
return fmt.Errorf("body of %q does not contain %q", url, want)
// Log response body, but truncate it if it's too large; the limit
// has been chosen arbitrarily.
if maxlen := 300; len(bs) > maxlen {
bs = bs[:maxlen]
}
return fmt.Errorf("body of %q does not contain %q (got: %q)", url, want, string(bs))
}
return nil