var net/textproto.commonHeader

4 uses

	net/textproto (current package)
		reader.go#L785: 	if v := commonHeader[string(a)]; v != "" {
		reader.go#L792: var commonHeader map[string]string
		reader.go#L797: 	commonHeader = make(map[string]string)
		reader.go#L839: 		commonHeader[v] = v

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