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fix nil map error when using plugin headers in legacy format (#3996)
* fix nil map error when using plugin headers in legacy format * create map on demand * better initialization
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@ -175,6 +175,9 @@ func transformHeadersFromPluginParams(params map[string]string) v1.HeaderOperati
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continue
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}
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if k = strings.TrimPrefix(k, "plugin_header_"); k != "" {
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if out.Set == nil {
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out.Set = make(map[string]string)
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}
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out.Set[k] = v
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}
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}
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