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reverseproxy: Improve error message when using scheme+placeholder (#3393)
* reverseproxy: Improve error message when using scheme+placeholder * reverseproxy: Simplify error message Co-authored-by: Matt Holt <mholt@users.noreply.github.com> Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
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@ -103,6 +103,13 @@ func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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var network, scheme, host, port string
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if strings.Contains(upstreamAddr, "://") {
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// we get a parsing error if a placeholder is specified
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// so we return a more user-friendly error message instead
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// to explain what to do instead
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if strings.Contains(upstreamAddr, "{") {
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return "", d.Err("due to parsing difficulties, placeholders are not allowed when an upstream address contains a scheme")
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}
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toURL, err := url.Parse(upstreamAddr)
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if err != nil {
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return "", d.Errf("parsing upstream URL: %v", err)
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